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Unit 320 (South Tobacco Root Mountains)

Montana Hunting Guide — Elk

Unit 320 lies in Madison and Jefferson counties and covers about 837 square miles. Ground runs from 4,731 to 8,872 feet. Montana FWP publishes no per-unit elk success figure we can verify for this unit. Check land status on a current map before you plan a route.

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4,731–8,872 ft
Sampled elevation

Build your own PDF hunt guide for Unit 320

Answer a few questions about your tag, your season and your rig, and the Field Intelligence Report builds a print-ready Montana Unit 320 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.

Free accounts get one report a year with the top spot unlocked. ProHunt Pro includes unlimited reports, all three spots, the full camp plan, and GPX/KML downloads for onX and Google Earth. Prefer to see one first? Open the builder and pick any unit.

Elk Hunting in Unit 320

Unit 320 lies in Madison and Jefferson counties and covers about 837 square miles. Ground runs from 4,731 to 8,872 feet. Montana FWP publishes no per-unit elk success figure we can verify for this unit. Check land status on a current map before you plan a route.

Where to Find Elk in Unit 320

Montana FWP's material on unit 320 stops at the boundary — there is no agency account of where its elk live. 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 Madison and Jefferson counties. It runs to about 837 square miles.

What bounds unit 320

Montana FWP draws unit 320 in Madison and Jefferson counties with a boundary that runs on Highway 287, Route 41, Route 55 and Interstate 90, walked corner by corner in its hunting district legal descriptions. It tells you the shape of the unit and nothing about its inhabitants. 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: Hollowtop Mountain, Granite Peak and Mount Jefferson

Named high points inside the unit include Hollowtop Mountain at 10,599 feet, Granite Peak at 10,547 feet, Mount Jefferson at 10,483 feet, Branham Peaks at 10,450 feet and Lakeshore Mountain at 10,425 feet. Several carry a public-land flag in our data, which makes them the first places to try for a view. Elk on low, open country live on distance and visibility, so they see you first.

Holding ground: Buttertly Flats, Windy Pass and Montana Gulch

Below them sit Buttertly Flats at 8,186 feet, Windy Pass at 8,036 feet, Montana Gulch at 7,671 feet, Tom Graham Pass at 7,575 feet and Independence Gulch at 7,475 feet. Those are the basins, parks and bottoms this unit has, and they are what you glass into from above. Pick the one with the least road on its upwind side.

Water: Guymon Spring, Era Spring and Mud Spring

The water inside the unit line comes to 361 mapped stream reaches, 38 lakes, 225 stock tanks and 34 springs. Named sources include Guymon Spring, Era Spring, Mud Spring, Splan Springs, Westphal Spring and Lower Gooseberry Spring. On ground with that many tanks, knowing which two or three hold water in your season is the most useful thing a scouting trip can tell you.

Reading the land status

Our ownership read for this unit is approximate — it comes out as National Forest 60%, Private / Other 32% and State Trust 8%, so treat it as a starting point and check a current land-status layer before you plan a route. The unit runs from 4,731 feet to 8,872 feet, averaging 6,455 — that is a lot of vertical to cover, and it means the season you draw decides which half of the unit you hunt.

Unit 320 terrain and land status

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

The lay of it

  • 4,731–8,872 ft on a terrain sample , averaging 6,455 ft ; peaks can run higher. That spread means you can hunt two seasons in one day — plan clothing for both ends.
  • 836.6 sq mi inside the boundary. Big enough that picking one drainage beats driving three.

Who owns the ground

  • National Forest — 60%
  • State Trust — 8%
  • Private / Other — 32%

Roughly 68% is public. Carry a land-status layer anyway — these are area percentages, not a map of where the boundaries fall.

Water on the ground

  • 225 tanks
  • 34 springs
  • 361 stream segments
  • 38 lakes

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: Hollowtop Mountain (10,599 ft), Granite Peak (10,547 ft), Branham Peaks (10,450 ft), Lakeshore Mountain (10,425 ft)

Holding ground: Mustard Pass (9,625 ft), Low Pass (9,035 ft), Hells Hole (8,365 ft), Guymon Spring, Mud 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 320

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Elk Success Rates

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Elk Draw Odds

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

Search Montana Draw Odds

Montana FWP's draw recap has no elk record we can tie to unit 320. 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 Montana FWP's own draw recap for the hunt code you mean to apply for.

Unit Logistics & Expectations

Planning Notes

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Camp Sites

21 developed campgrounds in or beside the unit, including Potosi Campground, Branham Lake Campground. and Mill Creek Camgpround.

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Road Conditions

MT 287, US 287 and MT 55 are the named routes in the unit. Roughly 63 mi paved, 29 mi gravel and 3 mi four-wheel-drive.

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Terrain Difficulty

4,731–8,872 ft, averaging 6,455. More than 4,000 feet of relief, so plan the pack-out before the shot.

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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 72/42°F, 1.2 in.; Oct 58/32°F, 1.1 in.; Nov 44/23°F, 0.6 in..

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Cell Service

Verizon 21%, AT&T 14%, T-Mobile 7% of the unit area — modelled coverage, not measured. Assume no signal off the paved road.

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Nearest Town

Mammoth (7 mi), Pony (8 mi), Sheridan (13 mi)

Frequently Asked Questions

Where is Colorado unit 320?
Unit 320 lies in Madison and Jefferson counties. Montana FWP draws unit 320 with a boundary that runs on Highway 287, Route 41, Route 55 and Interstate 90, walked corner by corner in its hunting district legal descriptions. It covers about 837 square miles.
What is the elk success rate in unit 320?
Montana FWP publishes no elk success figure we can tie to unit 320 on its own — the 2023 harvest tables either omit the unit or report it in a grouping we could not read back to it reliably. Rather than quote a statewide average as though it were measured here, we say so. Check Montana FWP's current harvest estimates before you apply.
Where do you stay and resupply for a unit 320 hunt?
The nearest services our logistics pipeline finds for unit 320 are at Mammoth, about 7 miles from the unit's centre, with Pony at about 8 miles. There are also 21 developed campgrounds in or beside the unit.

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Sources & Verification

Every fact on this page is tied to a primary source below. Last fact-checked 2026-10-24.

  1. Montana FWP Hunting District Legal Descriptions, 2026/2027 — deer-elk hunting districts (pp. 19-35) — Montana Fish, Wildlife & Parks · supports: GMU boundary description, Counties the unit lies in · accessed 2026-10-24
  2. FWP hunting district feature services — deer/elk, antelope, moose, bighorn sheep and mountain goat districts (2026 and 2027 seasons) — Montana Fish, Wildlife & Parks · supports: Mapped extent of the unit, Which named ground falls inside the unit line · accessed 2026-10-24