U.S. Forest Service · Caribou-Targhee National Forest · Island Park, ID

Flat Rock (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.

More like this: electric hookups in Idaho · reservable in Idaho · big rigs in Idaho

Check availability on Recreation.gov ↗
FLAT ROCK (IDAHO)FLAT ROCK (IDAHO)FLAT ROCK (IDAHO)FLAT ROCK (IDAHO)
Photos via Recreation.gov

Site mix

Standard, no hookups10
Standard with electric6
Host/management25
Most sites here open on Recreation.gov six months ahead, at 10 a.m. Eastern. Sold out is not final: cancellations come back into the pool, most of them two to three days out. How to catch one

Site guide

Will my RV fit

The longest site here provides 65 feet of vehicle capacity. Most sites are shorter.

Have the trailer VIN? It carries the trailer length.

16 sites. Tap a filter to narrow the list; the map follows.

SiteTypeEntryFits, ftSurfaceShadePowerPeople / vehiclesFires
B002ElectricBack-in45GravelPartial50 amp8 / 1Yes
B003StandardBack-in45GravelNo8 / 1Yes
B004StandardBack-in45GravelNo8 / 1Yes
B005ElectricBack-in45GravelFull50 amp8 / 1Yes
B006ElectricBack-in45GravelFull50 amp8 / 1Yes
B007ElectricBack-in50GravelPartial50 amp8 / 1Yes
B008ElectricBack-in50GravelPartial50 amp8 / 1Yes
B009ElectricBack-in50GravelFull50 amp16 / 3Yes
B010StandardBack-in45GravelFullNo8 / 1Yes
B011StandardBack-in50GravelFullNo8 / 1Yes

Per-site records as published by the managing agency on Recreation.gov. Blank cells mean the agency listed nothing for that site. Check-in 2:00 PM, checkout 12:00 PM.

Amenities & rules

HookupsElectric
Max vehicle length65 ft
EquipmentRVs & trailers, Tents
CampfiresAllowed, subject to restrictions

The campground contains single and double campsites, some of which have 50-amp electric hookups. Sites are equipped with picnic and utility tables, a campfire ring and tent pad. Vault toilets, drinking water and trash collection are provided. All interior roads and parking spurs are gravel. Macks Inn is just across the highway from the campground and offers amenities such as boat rentals, shuttle service, showers, laundry facilities, gas and groceries.

Individual sites vary. Confirm on Recreation.gov or with the managing office.

Weather by month

NOAA climate normals →
Weather by month near Flat Rock (Idaho)10°20°30°40°50°60°January: 3.53 inches of precipitationFebruary: 2.64 inches of precipitationMarch: 2.05 inches of precipitationApril: 2.37 inches of precipitationMay: 2.99 inches of precipitationJune: 2.63 inches of precipitationJuly: 1.17 inches of precipitationAugust: 1.14 inches of precipitationSeptember: 1.66 inches of precipitationOctober: 2.09 inches of precipitationNovember: 2.54 inches of precipitationDecember: 4.01 inches of precipitationJanFebMarAprMayJunJulAugSepOctNovDecJanuary: 16.2°F averageFebruary: 18.6°F averageMarch: 26.5°F averageApril: 35.3°F averageMay: 45.4°F averageJune: 52.6°F averageJuly: 60.0°F averageAugust: 58.6°F averageSeptember: 50.1°F averageOctober: 37.7°F averageNovember: 25.0°F averageDecember: 16.0°F average0 in1 in2 in3 in4 in5 inTemp °FInches
The line is the average temperature and the bars are average precipitation at Island Park, 6 miles from the campground at 6,290 feet, station USC00104598 in the NOAA monthly climate normals for 1991 to 2020. Precipitation totals about 29 inches a year.

Getting there

From West Yellowstone, Montana, take U.S. Highway 20 south for 22 miles, or from Ashton, Idaho, take U.S. Highway 20 north for 30 miles. The campground entrance is 1/4 mile south of Macks Inn on the west side of the highway.

Nearest townIsland Park, Idaho
Coordinates44.4969° N, 111.3400° W · Directions ↗

Supplies & services

Dump stationDump station ↗15.9 mi
Outdoor gearEagle's Curios ↗16.3 mi

Locations © OpenStreetMap contributors. Call ahead; hours change seasonally.

Explore

Video

CampgroundViews.com - Flatrock Campground Island Park Idaho Forest Service

Worth a stop

Mesa Falls Scenic Byway is 11 miles south of the campground. This 28-mile road leads to scenic overlooks and trails at 110 foot Upper Mesa Falls and 85 foot Lower Mesa Falls. Harriman State Park is 13 miles south. The Henry's Fork meanders through the Harriman, offering excellent fishing. Over 20 miles of trails are available, and wildlife is abundant in this scenic park. Henry's Lake State Park is 10 miles north, offering fishing, a fish cleaning station and boat ramp. Yellowstone National Park's west entrance is just 22 miles north in the town of West Yellowstone, Montana. Visitors enjoy day-tripping to the park for unparalleled wildlife viewing and the beautiful and unique scenery.

  • 1.4 mi
    Coffee Pot Rapids
    2.1 mi trail · hiking, horse, bike
  • 3.2 mi
    Ponds Trail
    2.4 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 3.2 mi
    Shotgun Trail A
    0.07 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 3.2 mi
    Shotgun Trail
    0.6 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 3.4 mi
    Big Springs Interpretive Trail ↗
    0.9 mi trail · hiking, horse, bike
  • 3.7 mi
    Lakeside Trail
    1.5 mi trail · hiking, horse, bike, motorcycle and 2 more

Trail and trailhead records are the Forest Service's. Distances are straight-line to the nearer trail end. Trail conditions are not tracked here.

On the National Register nearby

On Register Atlas →

Natural features

Island Park is composed of two areas of extinct volcanic activity. The Henry's Fork Caldera sits inside the larger Island Park Caldera. The area is known for its dense forests of lodgepole pine, broad grassy meadows bursting with summer wildflowers and a wide variety of wildlife, including black and grizzly bears, moose, elk, deer, bald eagles, Sandhill cranes and much, much more. A mixed growth of lodgepole pine forest provides partial shade. A portion of one loop is fairly close to the river and some sites have river views.

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. Tubing, canoeing, kayaking and rafting are also popular on the river. The Big Springs National Recreation Water Trail begins at Big Springs and ends just northeast of the campground at Macks Inn. It offers a lazy three-hour float or canoe trip through beautiful scenery. Wildlife, including moose, bald eagles and Sandhill cranes, is often seen along the trail. Hiking, biking, horseback riding and ATVing are popular activities. Many miles of trails crisscross Island Park, including the 2.5-mile Coffee Pot Rapids Trail, which begins at nearby Upper Coffee Pot Campground and meanders along the riverbank. The Continental Divide National Scenic Trail and the Nez Perce Trail are in the area. Island Park Reservoir and Henry's Lake are nearby, both offer boating, water skiing and excellent fishing opportunities.

Guidebooks for Idaho

We earn a small commission if you buy through these links. It does not change what we list.

Titles come from Open Library's catalog, matched by subject heading or by title.

Reference

Questions people ask

Do I need a reservation at Flat Rock (Idaho)?

Sites at Flat Rock (Idaho) are reservable on Recreation.gov. Any walk-up sites are listed on the booking page.

Source: Recreation.gov

What time is check-in at Flat Rock (Idaho)?

Check-in 2:00 PM, checkout 12:00 PM.

Source: Recreation.gov

How many sites does Flat Rock (Idaho) have?

41 sites, including 10 standard sites without power and 6 standard sites with power.

Source: Recreation.gov

Will my RV fit at Flat Rock (Idaho)?

The longest site here provides 65 feet of vehicle capacity. Most sites are shorter. The sidebar tool checks a trailer or motorhome length against every site.

Source: Will my RV fit

Does Flat Rock (Idaho) have hookups?

Yes, electric hookups at some sites.

Source: Recreation.gov

Are there showers or a dump station at Flat Rock (Idaho)?

Macks Inn is just across the highway from the campground and offers amenities such as boat rentals, shuttle service, showers, laundry facilities, gas and groceries.

Source: Recreation.gov

Can I have a campfire at Flat Rock (Idaho)?

Fires are allowed in the provided rings under normal conditions.

Source: Recreation.gov

Is there cell service at Flat Rock (Idaho)?

FCC coverage maps show Verizon 5G and T-Mobile 5G at the campground point. Terrain changes that from one site to the next.

Source: FCC Broadband Map

What is there to do at Flat Rock (Idaho)?

Henry's Fork has great fly-fishing for rainbow and brook trout. The Recreation section on this page has the rest.

Source: Recreation

What is the nearest town to Flat Rock (Idaho)?

Island Park, Idaho. Mesa Falls Scenic Byway is 11 miles south of the campground.

Source: Getting there

What if Flat Rock (Idaho) is full?

The nearest public campgrounds are Upper Coffee Pot (1.3 mi), Big Springs Warming Hut (2.1 mi, partly first-come), and Mccrea Bridge (3.8 mi).

Source: Campgrounds nearby