Colorado GMU 18 Mule Deer Hunting
Grand County, northwest Colorado · 646 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 18 is like
GMU 18 spans 646 square miles of rolling to moderately steep terrain in Grand County's northwest region. Elevations range from 7,300 feet to 13,500 feet, with typical terrain around 9,400 feet. The unit is composed of 29 percent gentle slopes, 50 percent moderate slopes, 18 percent steep slopes, and 2 percent rugged terrain by area. The country supports mule deer across a mix of National Forest, BLM, and State Wildlife Area holdings, with private parcels interspersed throughout.
Approximately 64 percent of the unit—roughly 412 square miles—is open to public hunting on National Forest, BLM, and State Wildlife Area lands. An additional 23 percent consists of National Park Service ground where hunting is prohibited. The remaining 12 percent is private land. This mix of open public ground and closed holdings means a hunter must plan access carefully and understand which parcels are available.
Mule deer summer range covers 100 percent of the unit, while winter range occupies 16 percent. Winter concentration areas, where mule deer cluster during the coldest months, cover 8 percent of the unit. Migration corridors account for 6 percent. The contrast between broad summer distribution and more limited winter-range coverage suggests mule deer shift their distribution as the season advances and weather changes, though timing and extent vary with snow and cold.
Six seasons are offered, five of which are open to the public. Archery runs September 2–30 and is either-sex. Muzzleloader hunts occur September 12–20 for doe or buck. Three rifle seasons follow: the 2nd rifle runs October 24–November 1 for doe or buck; the 3rd rifle runs November 7–15 for doe or buck; and the 4th rifle runs November 18–22 for buck only. All seasons are during or just before the rut phases when buck behavior shifts from velvet shedding through migration and into the primary rut. Hunter pressure on this unit is extreme, and the draw is easy—often zero points—for the most accessible either-sex and buck codes. This rating applies only to the easiest unit-wide public-land hunts available to adult Colorado residents; other seasons, weapons, and nonresident applicants may require substantially more points.
Terrain & elevation
- Elevation
- 7,300–13,500 ft, typically around 9,400 ft
- Steepness
- Steep — mean slope 16.8°
- Slope breakdown
- 29% gentle · 50% moderate · 18% steep · 2% rugged
- Ground you can count on
- ~412 sq mi, plus ~4 sq mi of State Trust Land where access depends on enrollment
Land & access
About 64% of GMU 18 is public land a hunter can count on — National Forest, BLM and State Wildlife Areas. Another 23% is public but closed to hunting — National Park Service.
- National Forest53%
- BLM11%
- State Wildlife Area<1%
- State Trust Land<1%
- National Park Service23%
- Unclassified ownership<1%
- Private12%
Where mule deer live in the unit
Colorado Parks & Wildlife maps mule deer seasonal ranges statewide. This is how much of GMU 18 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
- Winter Range16%used in winter
- Winter Concentration8%where mule deer bunch up in winter
- Migration Corridors6%movement between ranges, not residence
Mule Deer seasons & weapons (2026)
| Season | Dates | Tags offered |
|---|---|---|
| Archery | September 2 – September 30 | Either-sex |
| Muzzleloader | September 12 – September 20 | Doe, Buck |
| 2nd Rifle | October 24 – November 1 | Doe, Buck |
| 3rd Rifle | November 7 – November 15 | Doe, Buck |
| 4th Rifle | November 18 – November 22 | Buck |
| Private-land only | October 24 – November 15 | 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 63°F, lows around 34°F, about 0.3 in of snow (mid-elevation normals)
- October — highs around 51°F, lows around 26°F, about 5.2 in of snow (mid-elevation normals)
- November — highs around 38°F, lows around 16°F, about 15 in of snow (mid-elevation normals)
GMU 18 mule deer hunting FAQ
Can a hunter with zero preference points draw this unit?
Yes. The easiest qualifying either-sex and buck hunts on GMU 18 draw at zero preference points for adult Colorado residents, making this unit accessible to first-time applicants. However, other seasons and weapons—and all nonresident applicant categories—may require points, and this easy-draw rating applies only to the most accessible unit-wide public-land hunts.
Is there enough public ground here for a hunter on foot?
Approximately 64 percent of the 646-square-mile unit is open to public hunting on National Forest, BLM, and State Wildlife Area land, providing roughly 412 square miles of accessible terrain. The mix of open and closed (National Park Service) holdings means careful planning is needed, but substantial public ground exists for those willing to locate it and find a way in.
When in the fall do the seasons align with the rut?
The archery and muzzleloader seasons in early September fall during velvet shedding, before the rut begins. The 2nd rifle season in late October and early November spans the transition into the primary rut. The 3rd rifle season (November 7–15) overlaps the early pre-rut and primary rut phases. The 4th rifle season (November 18–22) falls squarely in the primary rut, when buck behavior is most active.
How does weather change through the hunting season?
September begins mild, with highs around 63°F and minimal snowfall. October cools significantly, with highs near 51°F and average snowfall of 5.2 inches. November is cold and snowy, with highs near 38°F and average snowfall of 15 inches. Hunters should expect the season to grow steadily colder and wetter from opening to close.
Where does mule deer distribution shift as the season progresses?
Summer range covers the entire unit, but winter range occupies only 16 percent, with winter concentration areas covering 8 percent. As temperatures drop and snow accumulates through fall, mule deer are expected to concentrate on the smaller portion of the unit designated as winter range, though the exact timing and extent of this shift depend on weather and snow depth.
Why is this unit easy to draw despite extreme hunter pressure?
Draw difficulty and hunter pressure are separate factors. An easy-to-draw unit can still receive heavy hunting pressure because many hunters apply. GMU 18 offers abundant tags at low point requirements, but the combination of accessibility and popularity means the ground will be crowded once the season opens.
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.