Colorado GMU 581 Pronghorn Hunting
Park, Teller and Fremont counties, central Colorado · 689 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 581 is like
GMU 581 spans 689 square miles across Park, Teller and Fremont counties in central Colorado, covering rolling to moderately steep terrain. Elevation ranges from 5,300 feet to 10,900 feet, with typical elevations around 8,500 feet. The unit is composed of 47% gentle terrain, 40% moderate terrain, 13% steep terrain and 1% rugged terrain by area. Pronghorn hunting here takes place across the fall archery, muzzleloader and rifle seasons as the landscape cools from September highs near 68 degrees Fahrenheit to November highs in the mid-40s.
Public hunting access covers approximately 36% of the unit on BLM, National Forest and State Wildlife Areas. An additional 4.1% is Colorado State Trust Land where hunting access depends on CPW's Public Access Program enrollment. Approximately 56% of the unit is privately owned, 1.4% is National Park Service ground closed to hunting, and 2.9% is unclassified. The mix of public and private ground requires hunters to plan access carefully and understand which parcels are actually open to hunting.
Pronghorn range in the unit is defined by mapped seasonal layers. Overall Range covers 51% of the unit, representing the full extent of pronghorn range CPW has mapped. Winter Range covers 17% of the unit, and Winter Concentration covers 12%—a concentrated-use layer marking where pronghorn cluster during the winter period. Migration Corridors cover 2% of the unit. The presence of a Winter Concentration layer indicates that pronghorn do not spread evenly across their range but cluster on specific ground during that season. Hunters should expect pronghorn distribution to vary across the unit depending on the season and conditions.
The unit offers three seasons to public applicants: Archery from August 15 to September 20, Muzzleloader from September 21 to September 29, and Rifle from October 3 to October 11. All three seasons are either-sex or doe/buck hunts. Archery spans the Pre-Rut and Primary Rut phases as pronghorn establish territories and enter the rut. Muzzleloader overlaps the Primary Rut and Late Rut phases. Rifle occurs during the Late Rut phase as the rut winds down. Draw difficulty for the easiest unit-wide either-sex code for an adult Colorado resident is Hard, requiring 3–5 preference points in the primary draw, though applicants with fewer points may draw through the secondary draw or leftover list. Hunter pressure in the unit is low.
Terrain & elevation
- Elevation
- 5,300–10,900 ft, typically around 8,500 ft
- Steepness
- Steep — mean slope 13.2°
- Slope breakdown
- 47% gentle · 40% moderate · 13% steep · 1% rugged
- Ground you can count on
- ~245 sq mi, plus ~28 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 581.
Lower elevations
- Conifer50%
- Sagebrush28%
- Grass and meadow15%
- Other cover6%
- Riparian1%
Mid elevations
- Conifer45%
- Sagebrush25%
- Grass and meadow21%
- Other cover5%
- Riparian2%
- Aspen1%
Higher elevations
- Conifer42%
- Grass and meadow28%
- Sagebrush21%
- Aspen4%
- Other cover3%
- Riparian1%
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 36% of GMU 581 is public land a hunter can count on — BLM, National Forest and State Wildlife Areas. A further 4% is State Trust Land, which is huntable only where CPW has enrolled it. Another 1% is public but closed to hunting — National Park Service.
- BLM23%
- National Forest12%
- State Wildlife Area2%
- State Trust Land4%
- National Park Service1%
- Unclassified ownership3%
- Private56%
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.
“Ownership unclassified” means the source dataset does not record an owner for that acreage. It is not known to be public or private.
Where pronghorn live in the unit
Colorado Parks & Wildlife maps pronghorn seasonal ranges statewide. This is how much of GMU 581 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 Range51%the full extent of range CPW maps for pronghorn — near 100% on most units, and not a statement about when pronghorn are present
- Winter Range17%used in winter
- Winter Concentration12%where pronghorn bunch up in winter
- Migration Corridors2%movement between ranges, not residence
Pronghorn seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | August 15 – September 20 | Doe, Buck |
| Muzzleloader | September 21 – September 29 | Doe, Buck |
| Rifle | October 3 – October 11 | Doe, Buck |
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 68°F, lows around 36°F, about 0.1 in of snow (mid-elevation normals)
- October — highs around 57°F, lows around 25°F, about 2.1 in of snow (mid-elevation normals)
- November — highs around 45°F, lows around 15°F, about 3.1 in of snow (mid-elevation normals)
GMU 581 pronghorn hunting FAQ
How much ground can a public-land hunter actually hunt in this unit?
Public hunting access is limited to about 36% of the unit on BLM, National Forest and State Wildlife Areas. An additional 4.1% is State Trust Land, but it is only huntable where CPW has enrolled it in the Public Access Program—not all parcels are open. The remaining 56% is private land. A hunter must plan access carefully and know which ground is actually available.
Is this unit realistic for someone with no preference points?
The easiest unit-wide buck or either-sex code requires 3–5 preference points in the primary draw, making it difficult for zero-point applicants in that system. However, applicants with fewer points sometimes draw, and anyone can enter the secondary draw in June (pure random, no points) or check the leftover list after the primary draw closes.
How does pronghorn distribution change through the fall season?
Overall Range covers 51% of the unit year-round, but pronghorn concentrate into specific areas during winter. Winter Range covers 17% and Winter Concentration covers 12%, indicating that as fall advances, pronghorn cluster on concentrated-use ground rather than spreading across their broader range. This shift varies with weather and snow.
Which season offers the best hunting conditions for rut activity?
Muzzleloader (September 21–29) occurs during the Primary Rut and Late Rut phases, when rut activity peaks and then begins to decline. Archery (August 15–September 20) spans the Pre-Rut and Primary Rut phases, starting earlier in territory formation and catching the opening of the rut. Rifle (October 3–11) occurs in the Late Rut phase after peak rut intensity has passed.
What is the terrain like for hunting on foot?
The unit is rolling to moderately steep, with 47% gentle terrain, 40% moderate terrain, and 13% steep terrain. The remaining 1% is rugged. Hunters should expect a mix of easier and challenging footing depending on where they hunt, though the majority of the unit is gentle to moderate.
How does weather change across the fall season?
September highs average 68 degrees Fahrenheit with minimal snowfall. By October, highs drop to 57 degrees and snowfall averages 2.1 inches. November highs fall to 45 degrees with 3.1 inches of snowfall on average. Hunters should prepare for cooling temperatures and increasing snow as the season advances.
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.