Big Flat Campground is a primitive, high-elevation (5,000 ft) basecamp in Klamath National Forest offering 9 first-come, first-served sites with vault toilets, a small horse corral, and direct access to Trinity Alps Wilderness trails including Caribou Lakes.

No potable water or garbage service is available—campers must filter/boil creek water and pack out trash—and the remote location requires an 18-mile drive on Coffee Creek Road with no cell service.

The campground typically operates June through October depending on snow levels and has a 14-day stay limit.