game management unit · Washington Department of Fish and Wildlife
GMU 505 Mossyrock
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 505 Mossyrock
GMU 505 Mossyrock is a game management unit in Washington, United States, set by Washington Department of Fish and Wildlife. It covers about 768 km² (296 mi²). The town of Chehalis is inside it.
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
- 505
- Area
- 768 km²
- Area (miles)
- 296 mi²
- Boundaries
- 2026
Public and protected land mapped inside it
HuntGrid's public land layers map about 127 km² of public or protected land inside it, 17% 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 |
|---|---|---|
| Tacoma, City of | 98 | 13% |
| Washington Department of Fish & Wildlife | 34 | 4% |
| Unknown | 28 | 4% |
| Lewis County | 0.8 | under 1% |
| CITY OF TACOMA | 0.5 | under 1% |
| Chehalis, City of | 0.3 | under 1% |
| Bureau of Land Management | 0.2 | under 1% |
| Centralia, City of | 0.1 | under 1% |
| Other or unnamed managers | 0.2 | 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 |
| Black-tailed deer | Oct 17, 2026 to Nov 1, 2026 | antlered source |
| Elk (wapiti) | Nov 7, 2026 to Nov 18, 2026 | antlered source |
| Black-tailed deer | Nov 19, 2026 to Nov 22, 2026 | antlered source |
| Black-tailed deer | Nov 25, 2026 to Dec 31, 2026 | archery source |
| Elk (wapiti) | Nov 25, 2026 to Dec 8, 2026 | muzzleloader source |
| Elk (wapiti) | Nov 25, 2026 to Dec 15, 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 505 Mossyrock
- 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 505 Mossyrock (game management unit)?
About 768 km² (296 mi²), as HuntGrid maps Washington Department of Fish and Wildlife's boundary.
How much public or protected land is in GMU 505 Mossyrock?
HuntGrid's public land layers map about 127 km² of public or protected land, 17% of the unit; the largest share is managed by Tacoma, City of. Public land doesn't always mean you can hunt there.
Where are the season dates for GMU 505 Mossyrock?
This page lists 7 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 505 Mossyrock?
In the same unit system: GMU 501 Lincoln, GMU 503 Randle, GMU 510 Stormking, GMU 520 Winston, GMU 530 Ryderwood and GMU 667 Skookumchuck.
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.