Colorado GMU 161 Mule Deer Hunting
Jackson County, northwest Colorado · 408 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 161 is like
GMU 161 is a 408-square-mile unit in Jackson County, rolling terrain with some steeper breaks, spanning 7,800 to 12,200 feet in elevation. About 66 percent of the unit is gentle country, 28 percent moderate, and 6 percent steep or rugged combined. Mule deer inhabit this landscape across summer range that covers the entire unit, with seasonal movements tied to winter and migration patterns.
Public land covers roughly 68 percent of the unit, distributed across U.S. Forest Service, BLM, and State Wildlife Areas. An additional 4.8 percent is Colorado State Trust Land, huntable only where CPW has enrolled parcels in the Public Access Program; access to this ground is contingent on enrollment status. Private land comprises 27 percent of the unit. Public ownership is concentrated but not universal, and hunters must verify access on the ground given the mixture of ownership and the presence of private inholdings.
Mule deer occupy summer range across the full unit and use winter range on roughly 12 percent of the ground. Winter Concentration layers mark 4 percent of the unit where deer cluster during the winter period. A Migration Corridor layer covers 35 percent of the unit, indicating movement corridors but not residency. Hunters should expect deer distribution to shift with season and weather, with concentrations forming on winter grounds as the fall progresses and conditions cool.
GMU 161 offers seven hunting seasons across five weapons. Archery runs September 2–30 and allows either-sex harvest. Muzzleloader runs September 12–20 for does and bucks. Early Rifle spans September 5–October 7 for either-sex hunting. Four numbered rifle seasons follow: 1st Rifle October 14–18, 2nd Rifle October 24–November 1, 3rd Rifle November 7–15, and 4th Rifle November 18–22, all buck-only. September temperatures average highs near 64°F and lows near 38°F with minimal precipitation. October cools to highs near 51°F and lows near 28°F, with average snowfall of 4.7 inches. November brings substantial change, with highs dropping to 38°F and lows to 18°F, and average snowfall of 23.2 inches. The draw difficulty for the easiest unit-wide either-sex code available to adult Colorado residents is Moderate, requiring 1–2 preference points. Hunter pressure on the unit is High.
Terrain & elevation
- Elevation
- 7,800–12,200 ft, typically around 8,600 ft
- Steepness
- Gentle — mean slope 8.8°
- Slope breakdown
- 66% gentle · 28% moderate · 5% steep · 1% rugged
- Ground you can count on
- ~279 sq mi, plus ~19 sq mi of State Trust Land where access depends on enrollment
Land & access
About 68% of GMU 161 is public land a hunter can count on — National Forest, BLM and State Wildlife Areas. A further 5% is State Trust Land, which is huntable only where CPW has enrolled it.
- National Forest40%
- BLM26%
- State Wildlife Area2%
- State Trust Land5%
- Unclassified ownership<1%
- Private27%
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 mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 161 each range covers — the single best clue to whether mule deer are here in September, in November, or only passing through. The layers overlap, so they do not add to 100%.
- Summer Range100%used in summer
- Overall Range100%the full extent of range CPW maps for mule deer — near 100% on most units, and not a statement about when mule deer are present
- Migration Corridors35%movement between ranges, not residence
- Winter Range12%used in winter
- Winter Concentration4%where mule deer bunch up in winter
Mule Deer seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex |
| Muzzleloader | September 12 – September 20 | Doe, Buck |
| 1st Rifle | October 14 – October 18 | Buck |
| 2nd Rifle | October 24 – November 1 | Buck |
| 3rd Rifle | November 7 – November 15 | Buck |
| 4th Rifle | November 18 – November 22 | Buck |
| Early Rifle | September 5 – October 7 | 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 64°F, lows around 38°F, about 0.2 in of snow (mid-elevation normals)
- October — highs around 51°F, lows around 28°F, about 4.7 in of snow (mid-elevation normals)
- November — highs around 38°F, lows around 19°F, about 23.2 in of snow (mid-elevation normals)
GMU 161 mule deer hunting FAQ
Can a hunter with no preference points draw a tag in this unit?
The easiest unit-wide either-sex hunts draw with 1–2 preference points for adult Colorado residents, so a zero-point applicant will not reliably draw those codes. Some buck-only seasons may require additional points, and private-land-only and Ranching for Wildlife opportunities are separate systems. A prospective hunter should consult the current draw results to verify point requirements for specific hunt codes.
How much ground can a hunter actually hunt on public land?
Roughly 68 percent of the unit is National Forest, BLM, and State Wildlife Areas open to public hunting. An additional 4.8 percent is State Trust Land, huntable only where CPW has enrolled parcels in the Public Access Program; enrollment status varies and must be verified separately. The remaining 27 percent is private land. Access and road conditions still govern whether mapped public land is reachable, so hunters should scout the specific areas they intend to hunt.
Is this unit better for archery or rifle?
Archery (September 2–30) falls during the velvet-shed phase when bucks are still transitioning into fall patterns and may be unpredictable. Early Rifle (September 5–October 7) and the first numbered rifle season (October 14–18) occur during early fall movement, when deer are becoming more active. The 3rd Rifle (November 7–15) and 4th Rifle (November 18–22) overlap the primary rut and late rut, when buck activity intensifies. Season choice depends on personal preference and the specific hunting conditions expected for each window.
What should a hunter expect from the weather and terrain in November?
November brings a dramatic shift: average highs drop to 38°F and lows to 18°F, with average snowfall of 23.2 inches. The unit is rolling with some steeper breaks, so snow accumulation will make travel and movement more challenging as the month progresses. Hunters pursuing late seasons should plan for cold, snow-covered conditions and expect deer to consolidate on winter grounds.
Where do mule deer concentrate during the winter hunting season?
Winter Concentration layers mark 4 percent of the unit where mule deer cluster during winter, but the mapping does not specify where that ground is located within the unit. Winter Range covers 12 percent of the unit overall. Hunters should check detailed maps and local information to identify the specific areas where concentrations typically form and plan access accordingly.
Does this unit's draw difficulty mean tags are easy to get?
The Moderate draw difficulty (1–2 points) describes the easiest unit-wide either-sex hunt code and does not mean few hunters compete for tags. GMU 161 experiences High hunter pressure, so even though the draw tier is accessible, the ground will be used actively. Premium buck seasons in this unit require substantially more points than the easiest hunts.
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 — Deer 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) — mule deer 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 31, 2026.