game management unit · Washington Department of Fish and Wildlife
GMU 373 Horse Heaven
Washington, 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 373 Horse Heaven
GMU 373 Horse Heaven is a game management unit in Washington, United States, set by Washington Department of Fish and Wildlife. It covers about 3,022 km² (1,167 mi²). Towns inside it include Kennewick, West Richland and Prosser.
HuntGrid draws its boundary from Washington Department of Fish and Wildlife's data for the 2026 season. The agency's regulations say which species and seasons use it.
- Unit code
- 373
- Area
- 3,022 km²
- Area (miles)
- 1,167 mi²
- Boundaries
- 2026
Public and protected land mapped inside it
HuntGrid's public land layers map about 265 km² of public or protected land inside it, 9% 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 |
|---|---|---|
| Unknown | 208 | 7% |
| Bureau of Land Management | 37 | 1% |
| UMATILLA NATIONAL WILDLIFE REFUGE | 6.2 | under 1% |
| Umatilla National Wildlife Refuge | 6.2 | under 1% |
| Washington Department of Fish & Wildlife | 4.6 | under 1% |
| City of Richland | 3.3 | under 1% |
| KENNEWICK | 2.8 | under 1% |
| County of Benton | 2.6 | under 1% |
| Other or unnamed managers | 6.7 | 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 Washington Department of Fish and Wildlife's regulations:
| Species | Dates | Details |
|---|---|---|
| Cougar (mountain lion) | Sep 1, 2026 to Mar 31, 2027 | source |
| Elk (wapiti) | Oct 31, 2026 to Nov 15, 2026 | source |
| Elk (wapiti) | Oct 31, 2026 to Nov 15, 2026 | muzzleloader source |
| Mule deer | Nov 20, 2026 to Dec 8, 2026 | archery source |
| White-tailed deer | Nov 20, 2026 to Dec 8, 2026 | archery source |
| Elk (wapiti) | Nov 25, 2026 to Dec 8, 2026 | archery source |
The official regulations have the final word: check them before you hunt.
Official regulations: Washington Department of Fish 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 373 Horse Heaven
- 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.
Questions
How big is GMU 373 Horse Heaven (game management unit)?
About 3,022 km² (1,167 mi²), as HuntGrid maps Washington Department of Fish and Wildlife's boundary.
How much public or protected land is in GMU 373 Horse Heaven?
HuntGrid's public land layers map about 265 km² of public or protected land, 9% of the unit; the largest share is managed by Unknown. Public land doesn't always mean you can hunt there.
Where are the season dates for GMU 373 Horse Heaven?
This page lists 6 seasons a person has checked against Washington Department of Fish and Wildlife's regulations; the official regulations have the final word.
Which units are next to GMU 373 Horse Heaven?
In the same unit system: GMU 149 Prescott, GMU 372 Rattlesnake Hills, GMU 379 Ringold, GMU 381 Kahlotus and GMU 382 East Klickitat.
More on huntgrid.net
Sources
Unit boundary: Washington Department of Fish and Wildlife. Boundaries for the 2026 season.
HuntGrid isn't affiliated with Washington Department of Fish and Wildlife. The official regulations and maps have the final word.