GMU 421

About GMU 421

GMU 421 is a GMU in Colorado, United States, set by Colorado Parks and Wildlife. It covers about 1,400 km² (541 mi²). No town of the HuntGrid list lies inside it; the nearest is Palisade, about 10 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

421

Area

1,400 km²

Area (miles)

541 mi²

Boundaries

2026

Public and protected land mapped inside it

HuntGrid's public land layers map about 921 km² of public or protected land inside it, 66% of the unit. Some protected land is privately owned (a conservation group's, for one). By manager, as the source names it:

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:

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

• GMU 41
• GMU 42
• GMU 52
• GMU 411
• GMU 521

Other hunting units that cover part of it

• S24 Battlement Mesa (bighorn sheep GMU)
• Western Zone (duck zone)
• Western Zone (goose zone)

What HuntGrid shows for GMU 421

• 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 421?

About 1,400 km² (541 mi²), as HuntGrid maps Colorado Parks and Wildlife's boundary.

How much public or protected land is in GMU 421?

HuntGrid's public land layers map about 921 km² of public or protected land, 66% of the unit; the largest share is managed by Forest Service Region 02 Rocky Mountain. Public land doesn't always mean you can hunt there.

Where are the season dates for GMU 421?

This page lists 33 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 421?

In the same unit system: GMU 41, GMU 42, GMU 52, GMU 411 and GMU 521.

More on huntgrid.net

• Hunting map of Colorado
• HuntGrid, the hunting app

Sources

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

• The agency's boundary data
• Official regulations

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