| Hat Mountain | |
| Elevation Ft: | 8741 |
| Elevation Ref: | [1] |
| Prominence Ft: | 1177 |
| Listing: | California county high points 24th |
| Location: | Lassen County, California, U.S. |
| Map: | California#USA |
| Map Size: | 240 |
| Label Position: | below |
| Range: | Warner Mountains |
| Coordinates: | 41.1491°N -120.1266°W |
| Coordinates Ref: | [2] |
| Topo: | USGS Emerson Peak |
Hat Mountain is a mountain located in the Warner Mountains south of Eagle Peak in California. The peak, which rises to an elevation of 8741feet, is the highest point in Lassen County.[1] Lost Lake is located to the northwest of the summit.[3] Most of the precipitation that falls on Hat Mountain is snow due to the high elevation.[4]