Colorado GMU 15 Mule Deer Hunting
Routt, Grand and Eagle counties, northwest Colorado · 492 sq mi
Based on the EASIEST unit-wide buck or either-sex hunt code available to adult Colorado residents in the 2026 primary draw — the lowest preference-point tier that drew reliably. Private-land-only and Ranching for Wildlife hunts are excluded because neither is a unit-wide public-land opportunity — NOT because the public cannot draw them. A private-land-only license requires the hunter's own permission to hunt private ground; a Ranching for Wildlife license is valid on the participating ranches enrolled in that program. They are separate systems. Other weapons, seasons and nonresident applicants can require substantially more points. The band is a floor, not a target: even the easiest qualifying hunt here sits in that range.
What hunting GMU 15 is like
Unit 15 sprawls across northwestern Colorado in Routt, Grand, and Eagle counties over 492 square miles of rolling to moderately steep terrain. Elevation ranges from 6,700 feet to 10,800 feet, with typical hunting occurring near 8,800 feet. The unit comprises 42% gentle terrain, 51% moderate slopes, and 8% steep ground, creating country that offers a mix of accessible and challenging passages for hunters on foot.
Public land covers approximately 65% of the unit across National Forest, BLM, and State Wildlife Areas, providing a solid foundation for public hunters. An additional 1.5% is Colorado State Trust Land, though access depends on enrollment in CPW's Public Access Program and varies by parcel. Private land accounts for the remaining 33%, creating a patchwork that requires hunters to plan routes and check boundaries before heading out. The publicly owned lands provide extensive opportunity, but private inholdings and property lines still govern where a hunter can actually travel.
Mule deer occupy summer and winter range throughout much of the unit. Summer Range covers 100% of the unit, while Winter Range spans 25% and Winter Concentration 14%, with Migration Corridors covering 3%. This distribution reflects a seasonal shift in deer distribution as fall progresses. Hunters should anticipate mule deer concentrating in specific areas during the winter phase and moving through migration corridors during the transition periods, though the timing and extent of these movements vary with weather and snow.
The unit offers six seasons total: Archery (September 2–30, either-sex), Muzzleloader (September 12–20, doe/buck), Second Rifle (October 24–November 1, doe/buck), Third Rifle (November 7–15, doe/buck), Fourth Rifle (November 18–22, buck), and a private-land-only hunt (October 24–November 15, either-sex). Of these, three are rifle seasons available to public hunters. Archery and Muzzleloader fall during velvet-shed and early fall transition. The Second and Third Rifle seasons span early fall migration, nocturnal buck phase, early pre-rut staging, and into the primary rut. Fourth Rifle hunts the primary rut. Weather cools steadily from September highs near 65°F and lows near 34°F, through October with highs near 53°F and lows near 25°F, to November with highs near 39°F and lows near 14°F, with average snowfall climbing from 0.1 inches in September to 12.5 inches in November. The draw for this unit is easy, often requiring zero preference points for the most accessible buck or either-sex hunts, though draw pressure is high across all available seasons.
Terrain & elevation
- Elevation
- 6,700–10,800 ft, typically around 8,800 ft
- Steepness
- Moderate — mean slope 12.9°
- Slope breakdown
- 42% gentle · 51% moderate · 8% steep · 0% rugged
- Ground you can count on
- ~319 sq mi, plus ~7 sq mi of State Trust Land where access depends on enrollment
Habitat & cover
What actually grows here, by elevation. Each band adds to 100% on its own — these are shares of that band, not of GMU 15.
Lower elevations
- Sagebrush36%
- Conifer25%
- Aspen24%
- Other cover12%
- Riparian4%
Mid elevations
- Conifer43%
- Sagebrush30%
- Aspen18%
- Riparian5%
- Grass and meadow3%
- Other cover1%
Higher elevations
- Conifer77%
- Sagebrush9%
- Grass and meadow5%
- Aspen5%
- Riparian4%
Cover classes from the USGS National Land Cover Database, split into elevation bands. “Other cover” is the remainder of the classification — bare ground, water, agriculture and developed land — and is left unnamed rather than guessed at.
Land & access
About 65% of GMU 15 is public land a hunter can count on — National Forest, BLM and State Wildlife Areas. A further 1% is State Trust Land, which is huntable only where CPW has enrolled it.
- National Forest51%
- BLM11%
- State Wildlife Area3%
- State Trust Land1%
- Unclassified ownership<1%
- Private33%
Colorado State Trust Land is open to public hunting only where it is enrolled in CPW's Public Access Program. Check current enrollment before planning around it.
Where mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 15 each range covers — the single best clue to whether mule deer are here in September, in November, or only passing through. The layers overlap, so they do not add to 100%.
- Summer Range100%used in summer
- Overall Range100%the full extent of range CPW maps for mule deer — near 100% on most units, and not a statement about when mule deer are present
- Winter Range25%used in winter
- Winter Concentration14%where mule deer bunch up in winter
- Migration Corridors3%movement between ranges, not residence
Mule Deer seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex |
| Muzzleloader | September 12 – September 20 | Doe, Buck |
| 2nd Rifle | October 24 – November 1 | Doe, Buck |
| 3rd Rifle | November 7 – November 15 | Doe, Buck |
| 4th Rifle | November 18 – November 22 | Buck |
| Private-land only | October 24 – November 15 | Either-sex |
Dates span every hunt code of that type in this unit and can differ by code. Confirm the current brochure with Colorado Parks & Wildlife before applying.
Fall weather
- September — highs around 65°F, lows around 34°F, about 0.1 in of snow (mid-elevation normals)
- October — highs around 53°F, lows around 25°F, about 3.8 in of snow (mid-elevation normals)
- November — highs around 39°F, lows around 14°F, about 12.5 in of snow (mid-elevation normals)
GMU 15 mule deer hunting FAQ
How much ground can a public-land hunter actually reach here?
National Forest, BLM, and State Wildlife Areas make up approximately 65% of the unit—about 319 square miles—that are open to public hunting. An additional 1.5% is State Trust Land, but access depends on enrollment in CPW's Public Access Program and varies by parcel. Private land fills the remaining 33%, which means hunters must navigate boundaries carefully and verify access before entering unfamiliar country.
Is this unit realistic for a hunter with no preference points?
Yes, the easiest buck or either-sex hunts in the primary draw often require zero preference points, making this a unit where new applicants can draw. Other seasons and weapons can require substantially more points, and the draw remains highly competitive despite the low entry threshold, so success is not guaranteed.
Does the terrain favor early season or late season hunting?
The unit offers both early and late opportunities. Archery and Muzzleloader occur during velvet-shed transition when bucks are still in bachelor patterns, while rifle seasons span migration, pre-rut staging, and the primary rut through late November. Weather shifts dramatically as the season progresses, with November bringing significant snowfall and freezing temperatures that can concentrate deer and shift hunting conditions markedly.
Where do mule deer concentrate on this unit as fall progresses?
Winter Concentration covers 14% of the unit, marking specific areas where mule deer cluster during the winter phase. Summer Range spans the full unit, and Migration Corridors cover 3%, suggesting deer shift their distribution through fall transition. The exact location of these concentrated areas varies, and timing depends on weather and snow.
Is the terrain manageable for a hunter traveling on foot?
The unit is primarily gentle to moderately sloped, with 42% gentle terrain and 51% moderate slopes, making it generally accessible. Only 8% is steep ground, so most of the unit offers terrain a typical hunter can cover, though elevation ranges up to 10,800 feet and conditions will vary by location.
How does hunter pressure compare to the draw difficulty?
Draw difficulty is easy at the entry level, but overall hunter pressure is high, meaning the unit is crowded even though tags are accessible without many points. An easy draw and high pressure can coexist: the abundance of available tags does not reduce the number of hunters in the field.
Data sources & methodology
- Colorado Parks & Wildlife — Big Game hunting — seasons, weapons, hunt codes and license types
- CPW — Primary Draw rules — how preference points and the hybrid draw work
- CPW — Deer statistics, draw recap and Drawn Out At reports — the point levels behind the draw-difficulty bands
- CPW — Secondary Draw — licenses remaining after the primary draw
- USGS / MRLC — National Land Cover Database — habitat and cover classes by elevation band
- CPW — Maps and GIS (Species Activity Mapping) — mule deer seasonal range
- CPW — State Trust Land Finder — which State Trust acreage is enrolled and open to public hunting
- USGS PAD-US — Protected Areas Database of the United States — land ownership and access
- Daymet daily climate, 1991–2020 (Oak Ridge National Laboratory) — fall weather
Draw difficulty is a qualitative band, not published odds — the note under the summary above states exactly which hunt code it describes. Land shares are separate, non-overlapping categories: publicly owned is not the same as open to hunting, and State Trust Land is huntable only where CPW has enrolled it. Unit data last updated September 24, 2026.