GMU · Colorado Parks and Wildlife

GMU 100

Colorado, United States

The map opens on this unit. Turn on Hunting units in Layers to see its boundary with public land, your pins and the forecast.

About GMU 100

GMU 100 is a GMU in Colorado, United States, set by Colorado Parks and Wildlife. It covers about 2,744 km² (1,060 mi²). No town of the HuntGrid list lies inside it; the nearest is Brush, about 3.0 km from its edge.

HuntGrid draws its boundary from Colorado Parks and Wildlife's data for the 2026 season. The agency's regulations say which species and seasons use it.

Unit code: 100
Area: 2,744 km²
Area (miles): 1,060 mi²
Boundaries: 2026

Public and protected land mapped inside it

HuntGrid's public land layers map about 164 km² of public or protected land inside it, 6% of the unit. Some protected land is privately owned (a conservation group's, for one). By manager, as the source names it:

Manager	km²	Share
Colorado State Land Board	164	6%
Bureau of Land Management	0.2	under 1%
Colorado Division of Wildlife	0.0	under 1%

Boundaries are approximate and aren't legal descriptions. Public land doesn't always mean you can hunt there: check your local regulations and posted signs.

Public land: U.S. Geological Survey (USGS) Gap Analysis Project (GAP), 2025, Protected Areas Database of the United States (PAD-US) 4.1

Seasons and regulations

Seasons for this unit that a person has checked against Colorado Parks and Wildlife's regulations:

Species	Dates	Details
Elk (wapiti)	Sep 1, 2026 to Jan 31, 2027	rifle source
American black bear	Sep 2, 2026 to Nov 22, 2026	rifle source
Mule deer	Oct 24, 2026 to Nov 3, 2026	antlered, rifle, draw source
Mule deer	Oct 24, 2026 to Nov 3, 2026	antlerless, rifle, draw source
White-tailed deer	Oct 24, 2026 to Nov 3, 2026	antlered, rifle, draw source
White-tailed deer	Oct 24, 2026 to Nov 3, 2026	antlerless, rifle, draw source
Mule deer	Nov 4, 2026 to Nov 30, 2026	archery, draw source
White-tailed deer	Nov 4, 2026 to Nov 30, 2026	archery, draw source
Cougar (mountain lion)	Nov 23, 2026 to Mar 31, 2027	source
Mule deer	Dec 1, 2026 to Dec 14, 2026	antlered, rifle, draw source
Mule deer	Dec 1, 2026 to Dec 14, 2026	antlerless, rifle, draw source
White-tailed deer	Dec 1, 2026 to Dec 14, 2026	antlered, rifle, draw source
White-tailed deer	Dec 1, 2026 to Dec 14, 2026	antlerless, rifle, draw source
Mule deer	Dec 15, 2026 to Dec 31, 2026	archery, draw source
White-tailed deer	Dec 15, 2026 to Dec 31, 2026	archery, draw source

The official regulations have the final word: check them before you hunt.

Official regulations: Colorado Parks and Wildlife

Units around it

Next to it in the same unit system

Other hunting units that cover part of it

What HuntGrid shows for GMU 100

Its boundary on the map; tap inside it for the unit's card with the agency's regulations link.
Public land and the other hunting units in the same view, each with its source.
Season dates once a person has checked them, and legal shooting hours where the rule is checked.
Hourly wind with a scent cone for every stand, and official weather alerts.
Offline maps: download the area and use the map, your pins and the forecast with no signal.

Open in HuntGrid

Questions

How big is GMU 100?

About 2,744 km² (1,060 mi²), as HuntGrid maps Colorado Parks and Wildlife's boundary.

How much public or protected land is in GMU 100?

HuntGrid's public land layers map about 164 km² of public or protected land, 6% of the unit; the largest share is managed by Colorado State Land Board. Public land doesn't always mean you can hunt there.

Where are the season dates for GMU 100?

This page lists 15 seasons a person has checked against Colorado Parks and Wildlife's regulations; the official regulations have the final word.

Which units are next to GMU 100?

In the same unit system: GMU 97, GMU 98, GMU 99, GMU 101, GMU 106 and GMU 107.

Sources

Unit boundary: Colorado Parks and Wildlife. Boundaries for the 2026 season.

HuntGrid isn't affiliated with Colorado Parks and Wildlife. The official regulations and maps have the final word.