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
Colorado Game Management Unit 15 spans Routt, Grand and Eagle counties in the northwest region and covers 492 square miles of rolling to moderately steep terrain. Elevations range from 6,700 feet to 10,800 feet, with a typical elevation near 8,800 feet. The unit's slope profile is 42% gentle, 51% moderate and 8% steep. Mule deer hunting here takes place across a range of seasons, from early archery through late rifle, with opportunities that fall across multiple behavioral phases.
Public land comprises roughly 65 percent of the unit, made up of National Forest, BLM and State Wildlife Areas. An additional 1.5 percent is Colorado State Trust Land, huntable only where CPW has enrolled parcels in the Public Access Program. The remaining 33 percent is private land. The ownership structure means a hunter will find substantial public ground, though private inholdings and access routes will affect which areas are practically reachable.
Mule deer occupy the unit's summer range throughout the year and are mapped across the full overall range. Winter range covers 25 percent of the unit, with winter concentration on 14 percent—ground where deer cluster as the season advances. Migration corridors account for 3 percent. This distribution suggests that early-season hunters may encounter deer spread across much of the unit, while as temperatures drop and snow accumulates, concentrations become pronounced on the winter concentration ground.
The unit offers six seasons total, five available to public applicants: 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), and 4th Rifle (November 18–November 22, buck only). A sixth season is private-land only. The archery and muzzleloader seasons fall in the velvet-shed and early fall transition period. The 2nd Rifle spans early fall migration and nocturnal buck activity. The 3rd Rifle overlaps the early pre-rut staging period and the primary rut. The 4th Rifle falls entirely within the primary rut. September temperatures average highs near 65 degrees with minimal snowfall; October sees highs drop to the low 50s with roughly 3.8 inches of monthly snowfall; November highs fall to around 39 degrees with 12.5 inches of monthly snowfall. The unit draws an extreme level of hunter pressure and carries an easy draw difficulty, often attainable at zero preference points for the easiest unit-wide buck or either-sex hunt available to adult Colorado residents.
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
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
Is this unit realistic for a hunter with no preference points?
Yes. The unit carries an easy draw difficulty, often issuing tags at zero points for the easiest unit-wide buck or either-sex hunts available to adult Colorado residents. Other weapons, seasons and nonresident applicants can require substantially more points, but the most accessible public opportunity sits well within reach for new applicants.
Does the terrain work for a foot hunter?
The unit is mostly manageable. Forty-two percent is gentle, 51 percent moderate and 8 percent steep—the steep terrain is limited. The rolling to moderately steep profile, combined with elevations spanning 6,700 to 10,800 feet, means a hunter on foot can cover meaningful ground, though elevation change and the moderate slopes will demand fitness.
How much of the unit is actually huntable public ground?
Roughly 65 percent of the unit is generally open to public hunting—National Forest, BLM and State Wildlife Areas. An additional 1.5 percent is State Trust Land, huntable only where CPW has enrolled the parcels in the Public Access Program; specific enrollments are not listed here. The remaining 33 percent is private land. Roads, trailheads and private inholdings will still affect which open ground is practically reachable.
When do mule deer concentrate, and does that shift during the season?
Winter concentration covers 14 percent of the unit—ground where mule deer cluster. Winter range covers 25 percent. Early-season archery and muzzleloader hunters may find deer spread across the unit's broader summer and overall range. As the season progresses into November and snow accumulates, concentrations are expected to intensify on the winter concentration ground, though the timing and extent depend on weather and snow.
Which season falls during the rut?
The 3rd Rifle (November 7–November 15) and 4th Rifle (November 18–November 22) both overlap the Primary Rut period (November 11–November 25). The 3rd Rifle also overlaps the early pre-rut staging window. Earlier seasons—archery and muzzleloader—fall during velvet shed and early fall transition, before rut activity.
What kind of hunter pressure should I expect?
The unit carries an extreme level of hunter pressure—this is one of Colorado's most-hunted mule deer units. That said, the extreme pressure exists alongside easy draw odds; an easy-to-draw unit can still be crowded. A hunter should plan for busy opening weeks and public land overlap, especially during the rifle seasons.
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
- 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
- Federal and state land-ownership datasets — land ownership and access
- NOAA climate normals — 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 August 31, 2026.