Colorado GMU 15 Pronghorn 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
GMU 15 spans Routt, Grand and Eagle counties in the northwest region, covering 492 square miles of rolling to moderately steep terrain. Elevations range from 6,700 feet to 10,800 feet, with a typical elevation of 8,800 feet. The terrain breaks down as 42 percent gentle, 51 percent moderate slope, and 8 percent steep. This is primarily mule deer country, though the unit also supports pronghorn across portions of its range.
About 65 percent of the unit—roughly 319 square miles—is generally open to public hunting on National Forest, BLM and State Wildlife Areas. An additional 1.5 percent is Colorado State Trust Land, huntable only on parcels enrolled in CPW's Public Access Program. The remaining 33 percent is private ground. National Forest lands comprise 51 percent of the total unit area, BLM holds 11 percent, and State Wildlife Areas account for 2.8 percent. This mix of public ownership across the unit provides multiple entry points for hunters willing to scout access routes.
Pronghorn occupy portions of this unit, with Overall Range covering 14 percent of GMU 15 and Migration Corridors extending across 4 percent. Pronghorn are not uniformly distributed across the mapped range; hunters should expect animals within the seasonal ranges CPW has delineated but not necessarily throughout the unit. The muzzleloader season (September 21–29) overlaps the primary rut and early post-rut recovery period, when pronghorn are concentrated and active. The rifle season (October 3–11) falls in late post-rut recovery, as pronghorn begin transitioning toward fall grouping.
The unit offers two seasons available to public hunters: a muzzleloader season for doe or buck (September 21–29) and a rifle season for doe or buck (October 3–11). A private-land-only season for doe runs September 26–October 18. The draw for GMU 15 is easy, with the easiest unit-wide buck and either-sex codes often available at zero preference points, though other seasons and weapons may require substantially more. Hunter pressure across the unit is high. September temperatures at mid-elevation average highs of 65°F and lows of 34°F with minimal snowfall. October cools to highs of 53°F and lows of 25°F, with snowfall averaging 3.8 inches. By November, highs drop to 39°F and lows to 14°F, as snowfall increases to 12.5 inches monthly.
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 pronghorn live in the unit
Colorado Parks & Wildlife maps pronghorn seasonal ranges statewide. This is how much of GMU 15 each range covers — the single best clue to whether pronghorn are here in September, in November, or only passing through. The layers overlap, so they do not add to 100%.
- Overall Range14%the full extent of range CPW maps for pronghorn — near 100% on most units, and not a statement about when pronghorn are present
- Migration Corridors4%movement between ranges, not residence
Pronghorn seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Muzzleloader | September 21 – September 29 | Doe, Buck |
| Rifle | October 3 – October 11 | Doe, Buck |
| Private-land only | September 26 – October 18 | Doe |
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 pronghorn hunting FAQ
Can a hunter with no preference points draw pronghorn in this unit?
Yes. The easiest unit-wide buck and either-sex pronghorn codes draw reliably at zero preference points in the primary draw, making this a practical option for applicants without points. Other seasons and weapons may require more points, and premium hunts carry substantially higher preference-point requirements. Secondary draws and leftover lists offer additional opportunities outside the primary system.
Is this unit realistic for a hunter on foot with limited scouting time?
Roughly 65 percent of GMU 15 is open public land across National Forest, BLM and State Wildlife Areas, but entry, parking, and trail access still depend on specific locations and seasonal restrictions. High hunter pressure suggests that scouting before the season and understanding local access points are important. Pronghorn occupy only 14 percent of the unit's overall mapped range, concentrating their presence further.
How does the pronghorn rut timing affect which season to apply for?
The muzzleloader season (September 21–29) encompasses both the primary rut and early post-rut recovery, when pronghorn are most active and concentrated, offering peak conditions for spotting and stalking. The rifle season (October 3–11) falls entirely in late post-rut recovery, after peak rut activity has declined, as pronghorn begin forming larger fall groups.
Will early-fall weather allow hunting in comfortable conditions?
September offers pleasant conditions, with mid-elevation highs around 65°F and minimal snowfall. October becomes noticeably cooler and wetter, with highs dropping to 53°F and average snowfall of 3.8 inches, while November temperatures and snow increase further. Hunters choosing the earlier muzzleloader season will encounter warmer, drier weather.
What portion of this unit is accessible to public hunters and what is off-limits?
Approximately 65 percent of GMU 15 is open to public hunting on National Forest (51% of total), BLM (11%), and State Wildlife Areas (2.8%). An additional 1.5 percent is State Trust Land, huntable only where CPW has enrolled specific parcels. The remaining 33 percent is private ground. Physical access still depends on roads, trailheads and parking, which vary by location and season.
Is the pronghorn population strong in this unit, and should an applicant expect to see animals?
The data does not provide population estimates or abundance information. Pronghorn are mapped across 14 percent of the unit's overall range, but animals concentrate within that mapped area rather than dispersing evenly. Success depends on finding and hunting within the seasonal ranges where CPW has documented pronghorn presence.
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 — Pronghorn 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) — pronghorn 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.