Colorado Elk Mule Deer

Unit 521 (Paonia)

Colorado Hunting Guide — Elk, Mule Deer

Unit 521 lies in Gunnison and Delta counties and covers about 507 square miles. Ground runs from 5,561 to 12,732 feet. CPW bounds it by Delta-Mesa Co. line and Gunnison-Mesa Co. line among others. CPW's harvest estimates put elk success here as high as 19%. Federal land covers about 77% of it. Check land status on a current map before you plan a route.

View Draw Odds Colorado Hunting Guide

🏔️

77%

Public Land

⛰️

7,025–10,306 ft

Sampled elevation

Build your own PDF hunt guide for Unit 521

Answer a few questions about your tag, your season and your rig, and the Field Intelligence Report builds a print-ready Colorado Unit 521 guide around your hunt: three ranked spots with morning, afternoon and evening plays, a day-by-day plan, topo maps with every pin numbered, a camp and access plan, the legal and retrieval rules for this unit, shot discipline, a meat-care and pack-out plan, and a pre-trip checklist. Every coordinate sits on land recorded as public.

Elk guide Mule Deer guide

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Elk Hunting in Unit 521

Where to Find Elk in Unit 521

What CPW publishes for unit 521 is a boundary, not a elk map. So the ground below is the unit's own and the read on where to start is ours, labelled as such. The unit lies in Gunnison and Delta counties. It runs to about 507 square miles.

The lines of the unit: Delta-Mesa Co. line, Gunnison-Mesa Co. line and Gunnison-Pitkin Co. line

CPW has unit 521 bounded on the north by Delta-Mesa Co. line and Gunnison-Mesa Co. line; on the east by Gunnison-Pitkin Co. line, White River-Gunnison NF boundary and Ruby Range Summit; on the south by Gunnison CR 12 (Kebler Pass Rd.) and North Fork of Gunnison River; on the west by Jay Creek, West Res. No. 1, Overland Ditch and Grand Mesa- Gunnison NF boundary. Read it as a frame, not as a hint about animals. What it does give you is the way in: the rivers and highways you cross, and the divides that decide which drainage you end up in.

High ground inside the line: Chair Mountain, Ragged Peak and Hancock Peak

Named high points inside the unit include Chair Mountain at 12,732 feet, Ragged Peak at 12,636 feet, Hancock Peak at 12,401 feet, Ragged Mountain at 12,080 feet and The Raggeds at 11,367 feet. Several carry a public-land flag in our data, which makes them the first places to try for a view. Elk want timber to bed in and open ground to feed on, within a short walk of each other.

Holding ground: Stove Basin, Swan Basin and Betty Park

Below them sit Stove Basin at 10,578 feet, Swan Basin at 10,465 feet, Betty Park at 10,045 feet, Elk Park at 10,019 feet and Clear Fork Park at 9,476 feet. Those are the basins, parks and bottoms this unit has, and they are what you glass into from above. Reaching the edge of one before light beats reaching its middle at noon.

Water: Grouse Spring

Named sources include Grouse Spring. Nothing in the data says which of them run in autumn, so a scouting trip earns its fuel.

The herd this unit belongs to: E-14

CPW does not manage elk unit by unit. It manages them as data analysis unit E-14, and unit 521 is one piece of it. The rest of E-14 is unit 41, unit 42, unit 52, unit 411 and unit 421. That matters twice over: the population objective and the licence numbers are set for the whole area, and the animals move across unit lines inside it without noticing them.

Reading the land status

Our ownership read for this unit is approximate — it comes out as Private / Other 100%, so treat it as a starting point and check a current land-status layer before you plan a route. A grid sample of the unit reads 7,025 to 10,306 feet, and named ground inside the line runs 5,561 to 12,732 feet — take 5,561 to 12,732 as the spread, because the sample is a grid and misses both ends. With 7,171 feet between the two ends, that is a lot of vertical to cover, and it means the season you draw decides which half of the unit you hunt.

Unit 521 terrain and land status

Measured from the unit boundary, not from the agency write-up

The lay of it

7,025–10,306 ft on a terrain sample , averaging 8,366 ft ; peaks can run higher.
507 sq mi inside the boundary.

Who owns the ground

Private / Other — 100%

Roughly 0% is public. Carry a land-status layer anyway — these are area percentages, not a map of where the boundaries fall.

Water on the ground

Counts from mapping data, so this is how many exist, not how many hold water in a dry year. Sitting water only pays where you find fresh tracks.

Named features inside the unit

Glass from: Chair Mountain (12,732 ft), Hancock Peak (12,401 ft), Ragged Mountain (12,080 ft), The Raggeds (11,367 ft)

Holding ground: Angel Pass (11,963 ft), Gold Basin (11,035 ft), Buck Creek Basin (10,797 ft), Grouse Spring

Every one of these was tested against the unit polygon before it went on the map. They are starting points, not agency recommendations.

How to Hunt Elk in Unit 521

CPW's own harvest estimates put elk success in unit 521 at archery 15%, muzzleloader 19% and rifle 14%. A number that low means most hunters here go home empty, and the ones who don't put the days in first. The plan: find the feed, find the timber it backs onto, then watch the seam between them at the edges of the day.

Glassing from Chalk Mountain, Spruce Mountain and Lombard Slides

Take a position on one of Chalk Mountain (11,142 ft), Spruce Mountain (10,833 ft), Lombard Slides (10,335 ft) and Electric Mountain (10,297 ft) and be on it before light. Cold air slides downhill in the dark, so keep your scent out of the bowl you mean to watch; expect the thermals to turn uphill an hour after the sun reaches the slope. Work the glass in strips and go back over ground you already covered — animals appear in country you looked at ten minutes ago. On the rut hunts, September bugling works where you can get above a drainage and let the thermals carry sound downhill.

Timing the season: Sep, Oct, Nov

Season normals here run Sep 73/45°F, Oct 61/34°F and Nov 48/24°F. Warm afternoons compress the hunting into the first and last hour, and make meat care the day's real problem rather than the shot. Precipitation runs about 1.8 in. in Sep, 1.7 in. in Oct and 1.3 in. in Nov, and the graded gravel in this unit turns greasy wet.

Where unit 521 sits inside E-14

Across E-14, CPW's 2023 elk success runs 20% in unit 42, 19% in unit 411, 18% in unit 41, 17% in unit 421 and 15% in unit 521. That puts unit 521 behind 4 of the 5 other units in the herd. If the draw lets you choose, unit 42 carried the better number in the same herd — check its tag count before you read that as an easier hunt.

A first plan from the pins on this page

The map above marks Chair Mountain, Hancock Peak, Ragged Mountain and The Raggeds as places to see from, and Angel Pass, Gold Basin, Buck Creek Basin and Grouse Spring as ground to watch. Each pin is a named feature verified to fall inside the unit line, not a spot anyone has hunted. Join two of them into a morning: be on the first before light, move to the second once the thermals turn.

What a day here costs you

507 square miles is more country than a week will cover, so pick one drainage and learn it rather than driving the unit. The nearest services are at Paonia, about 14 miles out, which is an hour of your morning each way if you sleep there. With 3,281 feet between the lowest and highest ground, the walk back up out of a kill site is the part to plan first. Decide the night before where you will be at first light, and go there in the dark.

What we can't tell you

Some of the ground named above carries no land-status flag we trust, so check ownership on a current layer before you hunt it.

Getting in and staying out: unit 521

Nearest services

Paonia — 13.7 mi · groceries
Marble — 14.1 mi · no services listed
Hotchkiss — 21.7 mi · no services listed
Crawford — 24.2 mi · fuel, groceries
Mount Crested Butte — 27 mi · fuel, groceries, gear

Developed camps

Unnamed camp site
Unnamed camp site
Unnamed camp site
Erickson Springs Campground
Hawsapple Campground

Season weather and signal

Jan36° / 14° · 1.5" precip
Aug81° / 53° · 1.5" precip
Sep73° / 45° · 1.8" precip
Oct61° / 34° · 1.7" precip
Nov48° / 24° · 1.3" precip
Dec36° / 15° · 1.8" precip

Best signal is Verizon at about 15% of the unit. Plan on being out of contact and tell someone your route.

Colorado rules that decide your day

Summarised from CPW regulations. They change — read the current regulations and your permit-tag before you hunt.

Legal shooting hours

Big game may be taken from half an hour before sunrise to half an hour after sunset.

Motorized retrieval

Colorado has no general off-road retrieval allowance. Travel stays on designated routes, so plan to pack every animal out on your back or with stock. Check the forest or BLM travel map for the roads that are actually open in hunting season.

Tagging

Validate and attach your carcass tag before the animal is moved, and keep evidence of sex attached until the carcass reaches your home or a processor.

Leaving meat

Abandoning edible meat is illegal. CPW counts the four quarters and the loins.

Where you may not shoot

Occupied structures — No discharging a firearm within 50 yards of a developed campsite, and never toward an occupied building.
Roads — No shooting from or across a public road, and no shooting from a motor vehicle.

Elk: where to put the shot

Broadside or quartering away, on the back edge of the front leg about a third of the way up the body. That is lungs, and on a quartering-away angle it picks up the far shoulder.

Shots to refuse

No straight-on and no straight-away shots. An elk's chest is deep and the margin is small.
Nothing standing behind or overlapping the animal you picked. A pass-through kills the elk behind it too.
Your maximum range is the farthest you have put three shots in a paper plate off the sticks you are actually carrying. Not the farthest you have ever hit anything.
Scope on 3–4x. A herd fills a 12x field of view and you lose the animal you picked.

Identification:On an antlerless tag, legal means no antler of any kind through the skin. A spike looks exactly like a cow until it turns its head. If you can't see the head, don't shoot.

Plan the carry: roughly 150– 220 lb of boned-out meat, before head and hide — two to four large coolers, plus bagged ice from town. ProHunt planning estimate, not an agency figure.

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Elk Success Rates

All manners of take15%

Archery15%

Muzzleloader19%

Rifle14%

CPW's 2023 harvest estimates put elk success in unit 521 at 15% — 361 animals taken by 2,394 hunters. That is a lot of hunters in one unit, and the percentage is what it looks like after all of them have been through it.

Archery — 15% success, 161 taken by 1,049 hunters
Muzzleloader — 19% success, 36 taken by 185 hunters
Rifle — 14% success, 163 taken by 1,160 hunters

These are the agency's own printed figures for this unit, not a modelled estimate and not a state average. They describe one season, so check CPW's current harvest estimates before you read a trend into them.

Elk Draw Odds

Season	Tags	Applicants	Draw %	Pts Req
Rifle — 2nd Season cow only (resident)	24	153	15.7%	1
Rifle — 2nd Season cow only (nonresident)	5	70	7.1%	4
Rifle — 1st Season cow only (resident)	23	118	19.5%	—
Rifle — 1st Season cow only (nonresident)	9	85	10.6%	1
Rifle — 3rd Season cow only (resident)	19	105	18.1%	—
Rifle — 3rd Season cow only (nonresident)	7	29	24.1%	2
Rifle — 4th Season cow only (resident)	10	36	27.8%	—
Rifle — 4th Season cow only (nonresident)	0	9	0.0%	—
Muzzleloader — 1st Season cow only (resident)	14	54	25.9%	—
Muzzleloader — 1st Season cow only (nonresident)	4	71	5.6%	3
Archery — 1st Season either sex (resident)	142	382	37.2%	—
Archery — 1st Season either sex (nonresident)	584	1,332	43.8%	—

Data from 2026 draw results. Each row is one residency pool — read the label before the number.

Open in Draw Odds Engine

CPW's 2026 draw recap for elk in unit 521, by hunt code, with resident and nonresident kept apart because the two draw from different licence pools:

EE521O1A — Archery, 1st Season, Either Sex, nonresident: 1,332 applicants for 584 licences, 43.8% drawn, no preference points needed
EE521O1A — Archery, 1st Season, Either Sex, resident: 382 applicants for 142 licences, 37.2% drawn, no preference points needed
EF521O2R — Rifle, 2nd Season, Cow Only, resident: 153 applicants for 24 licences, 15.7% drawn, 1 preference point needed
EF521O1R — Rifle, 1st Season, Cow Only, resident: 118 applicants for 23 licences, 19.5% drawn, no preference points needed

Colorado runs a pure preference-point draw, so the point figure above is the requirement the agency published for that code in that year, not a forecast for the next one. There are 8 further code-and-residency combinations in the recap for this unit. Figures checked against CPW's own statistics pages on 2026-06-09.

Mule Deer Hunting in Unit 521

Unit 521 lies in Gunnison and Delta counties and covers about 507 square miles. Ground runs from 5,561 to 12,732 feet. CPW bounds it by Delta-Mesa Co. line and Gunnison-Mesa Co. line among others. CPW's harvest estimates put mule deer success here as high as 36%. Federal land covers about 77% of it. Check land status on a current map before you plan a route.

Where to Find Mule Deer in Unit 521

What CPW publishes for unit 521 is a boundary, not a mule deer map. So the ground below is the unit's own and the read on where to start is ours, labelled as such. The unit lies in Gunnison and Delta counties. It runs to about 507 square miles.

The lines of the unit: Delta-Mesa Co. line, Gunnison-Mesa Co. line and Gunnison-Pitkin Co. line

CPW has unit 521 bounded on the north by Delta-Mesa Co. line and Gunnison-Mesa Co. line; on the east by Gunnison-Pitkin Co. line, White River-Gunnison NF boundary and Ruby Range Summit; on the south by Gunnison CR 12 (Kebler Pass Rd.) and North Fork of Gunnison River; on the west by Jay Creek, West Res. No. 1, Overland Ditch and Grand Mesa- Gunnison NF boundary. Read it as a frame, not as a hint about animals. Its value is practical — those are the features you will navigate by, and the ridges that separate one day's country from another's.

High ground inside the line: Marcellina Mountain, Mount Darline and The Dyke

Named high points inside the unit include Marcellina Mountain at 11,334 feet, Mount Darline at 11,310 feet, The Dyke at 11,198 feet, Chalk Mountain at 11,142 feet and Spruce Mountain at 10,833 feet. Several carry a public-land flag in our data, which makes them the first places to try for a view. Mule deer bed on broken ground with a view and feed on the brush below it.

Holding ground: Muddy Basin, Springhouse Park and Thousand Acre Flats

Below them sit Muddy Basin at 9,233 feet, Springhouse Park at 9,039 feet, Thousand Acre Flats at 8,868 feet, Horse Ranch Park at 8,867 feet and Mule Park at 8,856 feet. That is the low country of the unit — the ground animals drop into when they are pushed or when the weather turns. Work out which of them you can see from one position before you pick a camp.

Water: Grouse Spring

Named sources include Grouse Spring. Nothing in the data says which of them run in autumn, so a scouting trip earns its fuel.

The herd this unit belongs to: D-51

CPW does not manage mule deer unit by unit. It manages them as data analysis unit D-51, and unit 521 is one piece of it. The rest of D-51 is unit 52 and unit 411. Read a neighbour in the same herd before you read the state average — the herd, not the unit line, is what the agency is steering.

Reading the land status

Unit 521 terrain and land status

Measured from the unit boundary, not from the agency write-up

The lay of it

7,025–10,306 ft on a terrain sample , averaging 8,366 ft ; peaks can run higher.
507 sq mi inside the boundary.

Who owns the ground

Private / Other — 100%

Roughly 0% is public. Carry a land-status layer anyway — these are area percentages, not a map of where the boundaries fall.

Water on the ground

Counts from mapping data, so this is how many exist, not how many hold water in a dry year. Sitting water only pays where you find fresh tracks.

Named features inside the unit

Glass from: Chair Mountain (12,732 ft), Hancock Peak (12,401 ft), Ragged Mountain (12,080 ft), The Raggeds (11,367 ft)

Holding ground: Angel Pass (11,963 ft), Gold Basin (11,035 ft), Buck Creek Basin (10,797 ft), Grouse Spring

Every one of these was tested against the unit polygon before it went on the map. They are starting points, not agency recommendations.

How to Hunt Mule Deer in Unit 521

CPW's own harvest estimates put mule deer success in unit 521 at archery 18% and rifle 36%. That is an ordinary spread for this country, and it rewards whoever scouted. The plan: glass the broken edges at first light, then sit still and keep glassing the same ground.

Glassing from Oil Well Mountain, Buck Mesa and Elk Knob

Take a position on one of Oil Well Mountain (10,073 ft), Buck Mesa (9,811 ft), Elk Knob (9,692 ft) and Pilot Knob (9,692 ft) and be on it before light. In the dark the air runs downhill. Pick an approach that doesn't send it into the country you want to see, and plan to move once the slope warms. Work the glass in strips and go back over ground you already covered — animals appear in country you looked at ten minutes ago. On the rut hunts, late-season hunts put bucks with doe groups and moving in daylight.

Timing the season: Sep, Oct, Nov

Where unit 521 sits inside D-51

Across D-51, CPW's 2023 mule deer success runs 56% in unit 52, 52% in unit 411 and 34% in unit 521. Unit 521 is the lowest of them, so whatever drives success in this herd is happening somewhere else in it. If the draw lets you choose, unit 52 carried the better number in the same herd — check its tag count before you read that as an easier hunt.

A first plan from the pins on this page

What a day here costs you

507 square miles is more country than a week will cover, so pick one drainage and learn it rather than driving the unit. The nearest services are at Paonia, about 14 miles out, which is an hour of your morning each way if you sleep there. With 3,281 feet between the lowest and highest ground, the walk back up out of a kill site is the part to plan first. Leave the truck earlier than you want to and you will hunt the best half-hour of the day.

What we can't tell you

Some of the ground named above carries no land-status flag we trust, so check ownership on a current layer before you hunt it.

Getting in and staying out: unit 521

Nearest services

Paonia — 13.7 mi · groceries
Marble — 14.1 mi · no services listed
Hotchkiss — 21.7 mi · no services listed
Crawford — 24.2 mi · fuel, groceries
Mount Crested Butte — 27 mi · fuel, groceries, gear

Developed camps

Unnamed camp site
Unnamed camp site
Unnamed camp site
Erickson Springs Campground
Hawsapple Campground

Season weather and signal

Jan36° / 14° · 1.5" precip
Aug81° / 53° · 1.5" precip
Sep73° / 45° · 1.8" precip
Oct61° / 34° · 1.7" precip
Nov48° / 24° · 1.3" precip
Dec36° / 15° · 1.8" precip

Best signal is Verizon at about 15% of the unit. Plan on being out of contact and tell someone your route.

Colorado rules that decide your day

Summarised from CPW regulations. They change — read the current regulations and your permit-tag before you hunt.

Legal shooting hours

Big game may be taken from half an hour before sunrise to half an hour after sunset.

Motorized retrieval

Tagging

Validate and attach your carcass tag before the animal is moved, and keep evidence of sex attached until the carcass reaches your home or a processor.

Leaving meat

Abandoning edible meat is illegal. CPW counts the four quarters and the loins.

Where you may not shoot

Occupied structures — No discharging a firearm within 50 yards of a developed campsite, and never toward an occupied building.
Roads — No shooting from or across a public road, and no shooting from a motor vehicle.

Mule Deer: where to put the shot

Broadside or quartering away, on the back edge of the front leg about a third of the way up the body.

Shots to refuse

Nothing behind or overlapping the animal you picked.
Your maximum range is the farthest you have shot a three-shot group into a paper plate from the rest you are carrying.
Pass the shot you are talking yourself into.

Plan the carry: roughly 40– 120 lb of boned-out meat, before head and hide — two large coolers. ProHunt planning estimate, not an agency figure.

Pro Members Only

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Upgrade to Pro — $49/yr

Mule Deer Success Rates

All manners of take34%

Archery18%

Rifle36%

CPW's 2023 harvest estimates put mule deer success in unit 521 at 34% — 149 animals taken by 443 hunters. The hunter count is large enough for the percentage to mean something and small enough that a good or bad year still moves it.

Archery — 18% success, 11 taken by 63 hunters
Rifle — 36% success, 124 taken by 340 hunters

Mule Deer Draw Odds

Draw odds data not available for this specific unit/species combination in our database.

Search Colorado Draw Odds

CPW's draw recap has no mule deer record we can tie to unit 521. That usually means the licence is sold over the counter, is issued under a hunt code covering several units, or was not offered in the years we hold. Rather than estimate a point requirement, we leave it blank — check CPW's own draw recap for the hunt code you mean to apply for.

Unit Logistics & Expectations

Planning Notes

⛺

Camp Sites

7 developed campgrounds in or beside the unit, including Erickson Springs Campground, Hawsapple Campground and Spruce Campground.

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Road Conditions

Roughly 0 mi paved, 0 mi gravel and 0 mi four-wheel-drive.

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Terrain Difficulty

7,025–10,306 ft, averaging 8,366. Enough relief to separate summer from winter range.

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Hunting Pressure

Our land-status read for this unit is approximate, so treat any pressure estimate from it with suspicion and check a current ownership layer.

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Weather

Season normals: Sep 73/45°F, 1.8 in.; Oct 61/34°F, 1.7 in.; Nov 48/24°F, 1.3 in..

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Cell Service

Verizon 15%, AT&T 10%, T-Mobile 5% of the unit area — modelled coverage, not measured. Assume no signal off the paved road.

🏘️

Nearest Town

Paonia (14 mi), Marble (14 mi), Hotchkiss (22 mi)

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Frequently Asked Questions

Where is Colorado unit 521?

Unit 521 lies in Gunnison and Delta counties, and CPW has it bounded on the north by Delta-Mesa Co. line and Gunnison-Mesa Co. line; on the east by Gunnison-Pitkin Co. line, White River-Gunnison NF boundary and Ruby Range Summit; on the south by Gunnison CR 12 (Kebler Pass Rd.) and North Fork of Gunnison River; on the west by Jay Creek, West Res. No. 1, Overland Ditch and Grand Mesa- Gunnison NF boundary. It covers about 507 square miles.

What is the elk success rate in unit 521?

CPW's 2023 harvest estimates put elk success in unit 521 at 15% across all manners of take, and archery 15%, muzzleloader 19% and rifle 14% by weapon. Those are the agency's own figures for this unit, not a statewide average.

Where do you stay and resupply for a unit 521 hunt?

The nearest services our logistics pipeline finds for unit 521 are at Paonia, about 14 miles from the unit's centre, with Marble at about 14 miles. There are also 7 developed campgrounds in or beside the unit.

What is the mule deer success rate in unit 521?

CPW's 2023 harvest estimates put mule deer success in unit 521 at 34% across all manners of take, and archery 18% and rifle 36% by weapon. Those are the agency's own figures for this unit, not a statewide average.

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Sources & Verification

Every fact on this page is tied to a primary source below. Last fact-checked 2026-10-23.

Colorado Big Game Hunting Brochure — Game Management Unit (GMU) Descriptions (pp. 79-80-81-82) — Colorado Parks and Wildlife · supports: GMU boundary description, Counties the unit lies in, Data analysis unit (DAU) the unit belongs to · accessed 2026-10-22
2023 Colorado Elk Harvest Estimates — Colorado Parks and Wildlife · supports: Percent success for elk in unit 521, Hunters and harvest by weapon and season · accessed 2026-10-22
CPW CPWAdminData feature service — GMU and sheep/goat unit boundaries — Colorado Parks and Wildlife GIS Unit · supports: Mapped extent of the unit, Which named ground falls inside the unit line · accessed 2026-10-22
2023 Colorado Deer Harvest Estimates — Colorado Parks and Wildlife · supports: Percent success for mule deer in unit 521, Hunters and harvest by weapon and season · accessed 2026-10-22

Unit 521 (Paonia)

Build your own PDF hunt guide for Unit 521

Elk Hunting in Unit 521

Where to Find Elk in Unit 521

The lines of the unit: Delta-Mesa Co. line, Gunnison-Mesa Co. line and Gunnison-Pitkin Co. line

High ground inside the line: Chair Mountain, Ragged Peak and Hancock Peak

Holding ground: Stove Basin, Swan Basin and Betty Park

Water: Grouse Spring

The herd this unit belongs to: E-14

Reading the land status

Unit 521 terrain and land status

The lay of it

Who owns the ground

Water on the ground

Named features inside the unit

How to Hunt Elk in Unit 521

Elk Success Rates

Elk Draw Odds

Mule Deer Hunting in Unit 521

Where to Find Mule Deer in Unit 521

The lines of the unit: Delta-Mesa Co. line, Gunnison-Mesa Co. line and Gunnison-Pitkin Co. line

High ground inside the line: Marcellina Mountain, Mount Darline and The Dyke

Holding ground: Muddy Basin, Springhouse Park and Thousand Acre Flats

Water: Grouse Spring

The herd this unit belongs to: D-51

Reading the land status

Unit 521 terrain and land status

The lay of it

Who owns the ground

Water on the ground

Named features inside the unit

How to Hunt Mule Deer in Unit 521

Mule Deer Success Rates

Mule Deer Draw Odds

Unit Logistics & Expectations

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Unit 521 — Mule Deer

Frequently Asked Questions

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Sources & Verification