Flat Rock (Idaho)
- Right now
- Nobody has saidNo season, no closure, no bookings to read
- A night
- $25–$62Across the site types the agency prices
- Sites
- 1716 on recreation.gov
The place
the agency’s own description · what’s there · 7 notices
In the agency’s own words
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. Keep reading
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.
Facilities
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.
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.
Nearby Attractions
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.
What the agency tells you
Wildlife Caution
Idaho OHV Safety Message
A $7 fee for extra vehicles will be collected at the campground
Everything else this campground posts · 4
No ATVs/OHVs allowed in the campground
This campground has first come, first served sites
Click here for more information on the Caribou-Targhee National Forest
Don't Move Firewood: Help prevent the spread of tree-killing pests in our national forests by obtaining firewood near your destination and burning it on-site. For more information visit dontmovefirewood.org.
Tents and rigs
- Sites
- 17
- Hookups
- 6 electric
- Longest rig
- 65 ft
- Accessible sites
- None listed
- Campfires
- Allowed, barring fire bans
- Shade
- Every site
Facilities
- Toilets
- Vault Toilets
- “…tables, a campfire ring and tent pad. Vault toilets, drinking water and trash collection are provided.…”
- Drinking water
- Yes
- “…ring and tent pad. Vault toilets, drinking water and trash collection are provided. All interior…”
- Boat ramp
- Yes
- Stay limit
- 14 nights
- recreation.gov facility rule maxStay
Around the campground
- On the water
- Reservoir, Lake, River, Meadow
- Biking
- Boating
- Fishing
- Hiking
- Hunting
- Wildlife viewing
- Night sky · 430th darkest of 523 in ID
- Bortle 3
No reading yet, book on recreation.gov
recreation.gov lists 16 of the 17 campsites the agency files here. The rest aren’t on its booking system, so a reservation won’t get you one.
No availability snapshot inside the last 36 hours, so this page draws nothing rather than ageing a reading into fiction.
Watch for a cancellation
Full? Watch it.
One email when a night opens, plus More Than Just Parks dispatches. Unsubscribe any time.
We read recreation.gov once an hour, at 40 minutes past, and write the first time a site in your window is free for the nights you asked for.
Scanners that check every few minutes exist, and most of them charge. This one is free, it reads the same calendar, and it won’t always be first.
Tell me when the season opens
Watch for the season to open
One email when the season goes on sale, plus More Than Just Parks dispatches. Unsubscribe any time.
We check once an hour, at 40 minutes past, and write the first time the agency has that season on sale.
Scanners that check every few minutes exist, and most of them charge. This one is free, it reads the same calendar, and it won’t always be first.
We make nothing when you book. The link goes straight to the government.
Every line of the receipt · 15
What you actually pay
“A $7 fee for extra vehicles will be collected at the campground” · the U.S. Forest Service’s own agency notice
Derived by CAMPANAC: the agency’s published rates for this season, $25–$62 a night, plus one $8 recreation.gov reservation fee for the booking. A weekend here means Friday and Saturday night, booked once. Optional charges (an extra vehicle, a second tent, a dump-station fee) are listed separately and aren’t in this total.
Who keeps the booking fee
The agency’s own policy text says the reservation fee and the cancellation processing fee are “retained by the reservation service contractor”, and that a campground concessionaire will decline to refund them because “they did not receive these fees”. Recreation.gov is run under contract by Booz Allen Hamilton. What share of your booking fee the contractor keeps isn’t published in any federal dataset we can read, so we print no number for it. Our reporting on the contract →
How we know this receipt · 6
rules read Sep 9, 2026 · rates Oct 1, 2026 · How we know all this
The sites
41 records · which ones have room · the site map
The sites, ranked
from 16 mapped sitesAll 41 records
Toilet distances are OpenStreetMap’s, measured for 16 of the 41 sites listed. A site with no reading is unknown, never far.
The price is derived by CAMPANAC, not published per site: the per-night rate this campground publishes for each site’s own site type. 17 of the 41 sites listed carry one, and a site whose type has no published rate sits out of the price rather than being called free.
Measured shade is NLCD Tree Canopy Cover 2024 (USDA Forest Service / MRLC) read at the site’s own coordinate, 27% canopy or more, and only for the sites the agency gave no Shade value. It never changes the agency’s own shaded count beside it.
| FLAT | B002 | standard electric | 45 ft | 50 amp | 92 ft | 1,012 ft | 1,275 ft | $31–$62 |
| FLAT | B003 | standard nonelectric | 45 ft | 99 ft | 1,051 ft | 1,210 ft | $25 | |
| FLAT | B004 | standard nonelectric | 45 ft | 94 ft | 1,111 ft | 1,386 ft | $25 | |
| FLAT | B005 | standard electric | 45 ft | 50 amp | 94 ft | 1,126 ft | 1,315 ft | $31–$62 |
| FLAT | B006 | standard electric | 45 ft | 50 amp | 101 ft | 1,196 ft | 1,502 ft | $31–$62 |
| FLAT | B007 | standard electric | 50 ft | 50 amp | 94 ft | 1,204 ft | 1,426 ft | $31–$62 |
| FLAT | B008 | standard electric | 50 ft | 50 amp | 126 ft | 1,322 ft | 1,575 ft | $31–$62 |
| FLAT | B009 | standard electric | 50 ft | 50 amp | 79 ft | 1,334 ft | 1,687 ft | $31–$62 |
| FLAT | B010 | standard nonelectric | 45 ft | 79 ft | 1,284 ft | 1,706 ft | $25 | |
| FLAT | B011 | standard nonelectric | 50 ft | 129 ft | 1,156 ft | 1,662 ft | $25 | |
| FLAT | B012 | standard nonelectric | 45 ft | 87 ft | 1,133 ft | 1,543 ft | $25 | |
| FLAT | B013 | standard nonelectric | 45 ft | 87 ft | 1,053 ft | 1,531 ft | $25 | |
| FLAT | B014 | standard nonelectric | 60 ft | 102 ft | 1,057 ft | 1,434 ft | $25 | |
| FLAT | B015 | standard nonelectric | 55 ft | 90 ft | 978 ft | 1,452 ft | $25 | |
| FLAT | B016 | standard nonelectric | 65 ft | 92 ft | 961 ft | 1,320 ft | $25 | |
| FLAT | B017 | standard nonelectric | 60 ft | 106 ft | 881 ft | 1,346 ft | $25 | |
| MANAGEMENT SITES | B001 | type not stated | 45 ft | $30 | ||||
| MANAGEMENT SITES | XXX1 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX10 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX11 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX12 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX13 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX14 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX15 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX16 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX17 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX18 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX19 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX2 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX20 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX21 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX22 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX23 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX24 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX3 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX4 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX5 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX6 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX7 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX8 | unnamed record | $30 | |||||
| MANAGEMENT SITES | XXX9 | unnamed record | $30 |
The agency files 24 more records here that aren’t sites for the night. It types every one of them MANAGEMENT rather than a campsite. They’re in the table above, marked for what they are, and none of them is counted as a site.
25 of 41 listed
Getting there
the map and the coordinate · the agency’s directions · the phone number
Where it is
Flatrock CampgroundTarghee National Forest · 0.0 mi
Upper Coffee PotTarghee National Forest · 1.4 mi
Big Springs Warming HutTarghee National Forest · 2.2 mi
McCrea BridgeTarghee National Forest · 3.8 mi
Big Springs CampgroundTarghee National Forest · 4.2 mi
Big Springs Grp. Area - Island ParkTarghee National Forest · 4.2 miFrom 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.
The weather
the next four days · the thirty-year normal
Next four days, and the thirty-year normal
Forecast
NWS forecast for Island Park, ID
Typical weather
Typical October night 22°F, day 50°F.
Coldest month of the year: typical December night 1°F, below freezing. Bring a bag rated colder than that, and expect ice in the water bottle.
Daily high and lowDays with 0.10 in or more
A normal is the 1991-2020 average for the month, not a forecast: about half of all Julys are colder than the July line. The seven-day forecast above answers the other question.
The land, and who answers for it
what threatens it · who answers for it
What threatens this place
You’re camping on ground somebody wants. We track the threats and the comment deadlines.
Who answers for this land
Flat Rock (Idaho) is in Idaho’s 2nd congressional district. Its representative, Mike Simpson (R), votes on the laws that decide what happens to this land. Public-lands grade so far: F. See every public-lands vote →