Flat Rock (Idaho)

US Forest Service · Idaho

Flat Rock (Idaho) in Idaho. Ringed marker is this site; the other dots are the 722 public campsites we map in Idaho.

Flat Rock Campground is located 22 miles south of West Yellowstone, Montana and 30 miles north of Ashton, Idaho in beautiful Island Park, Idaho. Flat Rock is adjacent to U.S. Highway 20 and the Henry's Fork of the Snake River at an elevation of 6,400 feet. Recreation Henry's Fork has great fly-fishing for rainbow and brook trout. The river's headwaters are at Big Springs, one of the nation's largest springs, just 4.5 miles from the campground.

What we know about it

Managed by: US Forest Service
Fee: $25–$31/night
Booking: Reservation required
Dogs: Allowed on a leash (USFS policy)
Site type: RV & Tent Campground
Suits an RV: Yes
Number of sites: 165
Phone: 208-558-7658 OR 208-270-0094
Coordinates: 44.49694, -111.34000

Plan the ride in, not just the night

Motocamp routes the vehicle you are actually in and picks up the road surface on the way. Download the state and it keeps working with no signal.

Start a 14-day trial

Nearest sites we map

Source: Recreation.gov, dated 2026-02-25, fetched 2026-09-07. Official listing.

All camping near West Yellowstone · All camping in Idaho