GMU 521: public land and hunting map
GMU 521 is one of Colorado Parks and Wildlife’s 186 Game Management Units (GMUs) in Colorado. It covers about 507 square miles (324,696 acres), and roughly 75% of it is public land: Forest Service 68%, BLM 7.2%, state land under 1%.
- 75%public land
- 507square miles
- 244,171public acres
- 6neighbouring units
Measured Oct 12, 2026 from agency boundaries and USGS PAD-US 4.1 · sources and method
Who manages the land
- Bureau of Land Management7.2%
- U.S. Forest Service68%
- State land (wildlife, trust and natural-resource agencies)under 1%
Share of the unit’s area. Federal agencies plus state wildlife, trust and natural-resource land, as the WikiHunt map classifies it. The rest is private, tribal, local or other land.
Rut: Published deer rut timing for Colorado: Mid-Nov – mid-Dec. Rut dates and sources for Colorado.
Units next to GMU 521
Colorado season dates, 2026
Statewide general seasons. Many units have their own dates, quotas or draw-only hunts, so check the unit in the regulations before you go.
| Species | Season | 2026 dates |
|---|---|---|
| Deer | Archery Deer | Sep 2 – Sep 30 |
| Deer | Muzzleloader Deer | Sep 12 – Sep 20 |
| Deer | Combined Rifle Deer | Oct 14 – Nov 22 |
| Elk | Archery Elk | Sep 2 – Sep 30 |
| Elk | Muzzleloader Elk | Sep 12 – Sep 20 |
| Elk | Combined Rifle Elk | Oct 14 – Nov 22 |
| Pronghorn | Rifle Antelope | Oct 3 – Oct 11 |
| Black bear | Fall Bear | Sep 2 – Nov 30 |
Full notes on the Colorado page · Colorado regulations.
Questions
How much of GMU 521 is public land?
About 75% of GMU 521 (244,171 of 324,696 acres) is federal or state public land in USGS PAD-US 4.1, mostly U.S. Forest Service, Bureau of Land Management and State land (wildlife, trust and natural-resource agencies). Public land is not always open land: check access and closures before you go.
Who manages the land in GMU 521?
U.S. Forest Service: 68%; Bureau of Land Management: 7.2%; State land (wildlife, trust and natural-resource agencies): under 1%. The rest is private, tribal, local government or other land.
Which units border GMU 521?
GMU 42, GMU 421, GMU 43, GMU 52, GMU 53 and GMU 55.
Where are the season dates and rules for GMU 521?
Colorado Parks and Wildlife sets them. Start at the Colorado hunting regulations. WikiHunt shows the statewide general seasons on the Colorado page and in the app.
Sources and method
- Boundary: Colorado Parks and Wildlife, the same layer the WikiHunt map draws.
- Public land: USGS Protected Areas Database (PAD-US) 4.1, Fee Managers layer (public domain).
- Method: the unit and PAD-US polygons are simplified to about 100 m and measured on a grid of about 250 cells across the unit, so overlapping records are counted once. Expect about ±1 percentage point.
- Season dates: WikiHunt’s season table, updated Sep 2, 2026, checked against each state’s published regulations. Dates change; the regulations win.
- Last updated: Oct 12, 2026. Spotted a mistake? Tell us.