Colorado GMU 521 Elk Hunting
Delta and Gunnison counties, northwest Colorado · 508 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 521 is like
Unit 521 spans 508 square miles across Delta and Gunnison counties in Colorado's northwest region, covering elevations from 5,400 feet to 13,100 feet with a typical mid-elevation around 8,500 feet. The terrain is rolling to moderately steep, with 35 percent gentle slopes, 45 percent moderate, 17 percent steep, and 3 percent rugged. This mixed topography offers varied country for hunters willing to work terrain ranging from accessible low-elevation ridges to more demanding higher slopes.
The unit is approximately 75 percent open to public hunting on National Forest and BLM land—roughly 382 square miles—with the remaining 25 percent in private ownership. The National Forest comprises 68 percent of the unit's total area and dominates public holdings, while BLM accounts for 7.6 percent. Private land is interspersed throughout, so hunters need to verify access routes and respect property boundaries.
Elk occupy summer range across 92 percent of the unit, with concentrated summer use on 80 percent of that ground. Winter range covers 57 percent of the unit, with concentrated winter use on 17 percent. Migration corridors are mapped across 9 percent. As temperatures drop from September highs near 68°F to November highs around 44°F, and snowfall accumulates from essentially zero in September to an average 8.6 inches in November, elk can be expected to shift from higher summer ground toward lower winter range. The timing and extent of this movement vary with weather patterns and snow depth.
The unit offers seven seasons including four rifle seasons. Archery runs September 2–30 for either-sex, coinciding with rut onset and primary rut phases. Muzzleloader hunts occur September 12–20 for antlerless or bull elk during the primary rut. First rifle runs October 14–18 for antlerless or bull during late rut and post-rut recovery. Second, third, and fourth rifle seasons span October 24–November 22 for antlerless and bull elk, covering post-rut recovery and migration transition phases. A private-land-only hunt covers the full season September 2–November 22 for either-sex. The unit draws with easy difficulty—often at zero preference points—on the easiest qualifying unit-wide bull or either-sex code for adult Colorado residents, and hunter pressure is moderate overall.
Terrain & elevation
- Elevation
- 5,400–13,100 ft, typically around 8,500 ft
- Steepness
- Steep — mean slope 15.9°
- Slope breakdown
- 35% gentle · 45% moderate · 17% steep · 3% rugged
- Ground you can count on
- ~382 sq mi
Land & access
About 75% of GMU 521 is public land a hunter can count on — National Forest and BLM.
- National Forest68%
- BLM8%
- Unclassified ownership<1%
- Private25%
Where elk live in the unit
Colorado Parks & Wildlife maps elk seasonal ranges statewide. This is how much of GMU 521 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 Range92%used in summer
- Summer Concentration80%where elk bunch up in summer
- Winter Range57%used in winter
- Winter Concentration17%where elk bunch up in winter
- Migration Corridors9%movement between ranges, not residence
Elk seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex |
| Muzzleloader | September 12 – September 20 | Antlerless, Bull |
| 1st Rifle | October 14 – October 18 | Antlerless, Bull |
| 2nd Rifle | October 24 – November 1 | Antlerless |
| 3rd Rifle | November 7 – November 15 | Antlerless |
| 4th Rifle | November 18 – November 22 | Antlerless, Bull |
| Private-land only | September 2 – November 22 | 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 68°F, lows around 42°F (mid-elevation normals)
- October — highs around 56°F, lows around 32°F, about 2.2 in of snow (mid-elevation normals)
- November — highs around 44°F, lows around 21°F, about 8.6 in of snow (mid-elevation normals)
GMU 521 elk hunting FAQ
Can a hunter with no preference points draw here?
Yes. The unit carries an easy draw difficulty rating and often draws at zero preference points on the easiest qualifying bull or either-sex hunts available to adult Colorado residents. Other weapons, seasons, and nonresident applicants may require additional points.
How much public land is actually huntable in this unit?
Approximately 75 percent of the unit—roughly 382 square miles of National Forest and BLM—is open to public hunting. The remaining 25 percent is private, so hunters must plan routes carefully and confirm access before entering.
Is this unit better suited to early or late season?
The archery and muzzleloader seasons in early September coincide with rut onset and the primary rut, when bulls are active and vocal. Later rifle seasons from October through November fall during post-rut recovery and migration transition, when hunting shifts to different tactics as cow-calf groups and bachelor bands reorganize.
When should a hunter expect elk to move toward lower ground?
As temperatures decline from September highs near 68°F to November lows near 21°F and snowfall increases from essentially nothing in September to an average 8.6 inches in November, elk can be expected to gradually shift from higher summer range toward lower winter range. The timing depends heavily on snow depth and weather variability.
What elevation bands hold concentrated elk use in summer and winter?
CPW maps summer concentration use across 80 percent of the unit's 92 percent summer range, indicating where elk cluster during that season. Winter concentration covers 17 percent of the unit's 57 percent winter range. The mapping indicates areas of concentrated use but does not specify elevation bands—that requires field research and recent scouting.
How much of this unit is steep or rugged terrain?
Only 20 percent of the unit is steep or rugged (17 percent steep, 3 percent rugged), while 35 percent is gentle and 45 percent is moderate slope. A hunter on foot can find manageable terrain throughout, though higher elevations toward the 13,100-foot maximum will naturally become more demanding.
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.