Colorado GMU 431 Elk Hunting
Pitkin County, northwest Colorado · 220 sq mi
Based on the EASIEST unit-wide bull 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 431 is like
GMU 431 is a 220-square-mile high-elevation unit in Pitkin County spanning 6,800 feet to 14,300 feet, with typical hunting occurring around 10,400 feet. The terrain is steep and broken: 16 percent of the unit is gentle, 38 percent moderate, 36 percent steep, and 10 percent rugged. Hunters should expect to work across difficult country with minimal easy ground, particularly in mid-elevation basins and ridges where elk concentrate seasonally.
Public hunting is available on roughly 73 percent of the unit, approximately 160 square miles of National Forest and BLM land. Private ground comprises about 24 percent, and roughly 2.4 percent is unclassified. The size and agency distribution of public ground allows access from multiple directions, though private inholdings and terrain steepness mean that entry and travel require planning. State Trust Land covers a negligible share and is not a practical hunting resource here.
Elk distribution shifts substantially across the fall. Summer Range covers 98 percent of the unit, with 5 percent marked as Summer Concentration where elk cluster. Resident Population mapping indicates year-round use on only 4 percent of the unit, meaning most elk move seasonally. Winter Range covers just 20 percent of the unit. As temperatures drop from September through November and snow accumulates, elk redistribute toward lower elevations and winter ground. Migration Corridors cover only 1 percent, indicating that movement is dispersed rather than funneled through narrow passes.
The unit offers six public seasons across a long fall window. Archery runs September 2–30, overlapping the transition into the primary rut. Muzzleloader hunts occur September 12–20 during peak rut. Four rifle seasons follow: October 14–18, October 24–November 1, November 7–15, and November 18–22, spanning the post-rut period through early winter range occupation. September conditions are cool but dry, with average highs near 59 degrees and minimal snowfall. October brings colder weather and 9 inches of average snowfall, while November drops significantly colder with nearly 28 inches of snow expected at mid-elevation. The draw is easy, typically requiring zero points for the most accessible bull and either-sex hunts available to adult Colorado residents. Hunter pressure is low overall.
Terrain & elevation
- Elevation
- 6,800–14,300 ft, typically around 10,400 ft
- Steepness
- Rugged — mean slope 23.9°
- Slope breakdown
- 16% gentle · 38% moderate · 36% steep · 10% rugged
- Ground you can count on
- ~160 sq mi
Land & access
About 73% of GMU 431 is public land a hunter can count on — National Forest and BLM.
- National Forest72%
- BLM1%
- State Trust Land<1%
- Unclassified ownership2%
- Private24%
“Ownership unclassified” means the source dataset does not record an owner for that acreage. It is not known to be public or private.
Where elk live in the unit
Colorado Parks & Wildlife maps elk seasonal ranges statewide. This is how much of GMU 431 each range covers — the single best clue to whether elk are here in September, in November, or only passing through. The layers overlap, so they do not add to 100%.
- Overall Range100%the full extent of range CPW maps for elk — near 100% on most units, and not a statement about when elk are present
- Summer Range98%used in summer
- Winter Range20%used in winter
- Summer Concentration5%where elk bunch up in summer
- Winter Concentration5%where elk bunch up in winter
- Resident Population4%the only layer that means year-round use
- Migration Corridors1%movement between ranges, not residence
Elk seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex, Antlerless |
| Muzzleloader | September 12 – September 20 | Antlerless, Bull |
| 1st Rifle | October 14 – October 18 | Either-sex, Antlerless |
| 2nd Rifle | October 24 – November 1 | Antlerless |
| 3rd Rifle | November 7 – November 15 | Antlerless |
| 4th Rifle | November 18 – November 22 | Either-sex, Antlerless |
| Private-land only | August 15 – January 15 | Either-sex, Antlerless |
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 59°F, lows around 35°F, about 0.5 in of snow (mid-elevation normals)
- October — highs around 48°F, lows around 26°F, about 9.2 in of snow (mid-elevation normals)
- November — highs around 38°F, lows around 15°F, about 27.7 in of snow (mid-elevation normals)
GMU 431 elk hunting FAQ
Can someone with zero preference points draw a bull tag here?
Yes. The unit draws easy for the most accessible bull and either-sex codes available to adult Colorado residents, often at zero points. However, specific seasons, nonresident applicants, and other weapon types can require substantially more points. A new applicant should confirm the exact preference-point requirement for the season and code they plan to pursue.
Which seasons are realistic for someone hunting late in the fall?
The third and fourth rifle seasons in November offer late-season opportunity. The third rifle season (November 7–15) falls during the migration transition as elk shift toward winter range, while the fourth (November 18–22) places hunters on emerging winter ground. Both run during heavy snow, with November averaging 28 inches at mid-elevation, which can slow hiking but may concentrate elk on lower terrain.
Does this unit hold enough year-round elk to hunt after December?
No public season extends past November 22. Resident Population mapping shows year-round use on only 4 percent of the unit, meaning the majority of elk leave as winter sets in and do not stay to support a December hunt.
How much huntable ground can a public-land hunter actually access?
Approximately 160 square miles (roughly 73 percent of the unit) is National Forest and BLM. Private inholdings at 24 percent and steep terrain complicate entry and travel. A hunter should scout access points and plan routes carefully, as steepness and elevation gain limit the country that one person can cover in a single day, even where ownership is public.
Where do elk concentrate during the archery and muzzleloader seasons?
Summer Concentration mapping shows elk cluster on 5 percent of the unit during early fall. This concentrated ground is not mapped to specific elevations or aspects; hunters must scout to locate it. Broad Summer Range coverage across 98 percent of the unit means elk are dispersed outside these concentration areas, requiring more ground search to find animals.
Is the terrain manageable for a hunter on foot?
The unit is steep and broken across 46 percent of its area, and mean slopes exceed 23 degrees. The remaining 54 percent includes 16 percent gentle ground, but much of the unit demands fitness and route-finding ability. High elevation and October–November snowfall add difficulty, especially above 10,000 feet where snow accumulation is substantial.
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 — Elk 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) — elk 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 28, 2026.