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Charles C
VerifiedJuly 30, 2020 Stayed at: B016, Loop: FLAT
Restrooms clean, camp site spacious, lots of shade at most sites. Be prepared for street noise since it is just off of the highway.
Helpful
Featured amenities
Parking
Restrooms
About Flat Rock (Idaho)
Flat Rock Campground is located 22 mi south of West Yellowstone, Montana and 30 mi 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 6.4 ft.
Available sites
37 total sitesActivities & Attractions
Nearby
Fishing
Year-round
Hiking
Year-round
Year-round
Fishing
Nearby
Hiking
Nearby
Seasonal information
2026
(Current year)
2026 Season availability
Current season
Upcoming seasons
Past seasons
Closed periods
Jan
Feb
Mar
Apr
May
Jun
Jul
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Currently closed
Campground Amenities
Most popular amenities
Parking
Restrooms
Water and Hygiene
- Restrooms
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Rates, Sites & Availability
Select check-in and check-out dates to see real-time availability for each site.
37 Sites Available
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B005, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
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B006, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
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B007, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
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B008, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
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B009, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
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B010, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B011, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B012, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B013, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B014, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B015, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B016, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B017, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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XXX1, Loop: MANAGEMENT SITES
Tent
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XXX10, Loop: MANAGEMENT SITES
Tent
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XXX11, Loop: MANAGEMENT SITES
Tent
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XXX12, Loop: MANAGEMENT SITES
Tent
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XXX13, Loop: MANAGEMENT SITES
Tent
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XXX14, Loop: MANAGEMENT SITES
Tent
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XXX15, Loop: MANAGEMENT SITES
Tent
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XXX16, Loop: MANAGEMENT SITES
Tent
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XXX17, Loop: MANAGEMENT SITES
Tent
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XXX18, Loop: MANAGEMENT SITES
Tent
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XXX19, Loop: MANAGEMENT SITES
Tent
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XXX2, Loop: MANAGEMENT SITES
Tent
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XXX20, Loop: MANAGEMENT SITES
Tent
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XXX21, Loop: MANAGEMENT SITES
Tent
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XXX22, Loop: MANAGEMENT SITES
Tent
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XXX23, Loop: MANAGEMENT SITES
Tent
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XXX24, Loop: MANAGEMENT SITES
Tent
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XXX3, Loop: MANAGEMENT SITES
Tent
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XXX4, Loop: MANAGEMENT SITES
Tent
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XXX5, Loop: MANAGEMENT SITES
Tent
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XXX6, Loop: MANAGEMENT SITES
Tent
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XXX7, Loop: MANAGEMENT SITES
Tent
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XXX8, Loop: MANAGEMENT SITES
Tent
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XXX9, Loop: MANAGEMENT SITES
Tent
No sites found matching your criteria.
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Site Details
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37 Sites Available
Site
Price
🚐
B005, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
🚐
B006, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
🚐
B007, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
🚐
B008, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
🚐
B009, Loop: FLAT
RV
50 amp · Gravel · Driveway entry: Back-In
🚐
B010, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B011, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B012, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B013, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B014, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B015, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B016, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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B017, Loop: FLAT
RV
Gravel · Driveway entry: Back-In
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XXX1, Loop: MANAGEMENT SITES
Tent
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XXX10, Loop: MANAGEMENT SITES
Tent
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XXX11, Loop: MANAGEMENT SITES
Tent
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XXX12, Loop: MANAGEMENT SITES
Tent
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XXX13, Loop: MANAGEMENT SITES
Tent
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XXX14, Loop: MANAGEMENT SITES
Tent
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XXX15, Loop: MANAGEMENT SITES
Tent
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XXX16, Loop: MANAGEMENT SITES
Tent
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XXX17, Loop: MANAGEMENT SITES
Tent
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XXX18, Loop: MANAGEMENT SITES
Tent
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XXX19, Loop: MANAGEMENT SITES
Tent
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XXX2, Loop: MANAGEMENT SITES
Tent
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XXX20, Loop: MANAGEMENT SITES
Tent
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XXX21, Loop: MANAGEMENT SITES
Tent
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XXX22, Loop: MANAGEMENT SITES
Tent
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XXX23, Loop: MANAGEMENT SITES
Tent
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XXX24, Loop: MANAGEMENT SITES
Tent
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XXX3, Loop: MANAGEMENT SITES
Tent
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XXX4, Loop: MANAGEMENT SITES
Tent
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XXX5, Loop: MANAGEMENT SITES
Tent
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XXX6, Loop: MANAGEMENT SITES
Tent
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XXX7, Loop: MANAGEMENT SITES
Tent
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XXX8, Loop: MANAGEMENT SITES
Tent
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XXX9, Loop: MANAGEMENT SITES
Tent
No available sites
All sites are booked for your selected dates. Try showing all sites to see booked options, create an alert to be notified when something opens up, or adjust your dates.
Reviews
188 reviews
Summary
Flat Rock Campground in Idaho offers a clean and well-maintained environment with spacious campsites and beautiful surroundings, making it a great spot for families and outdoor enthusiasts. Many reviews highlight the helpfulness of camp host Annie, who is praised for her dedication to maintaining the campground. However, some guests report issues with noise from the nearby highway and mixed experiences with camp hosts, suggesting improvements in host interactions and garbage management would enhance the overall experience.
Based on guest feedback
4.3
Overall rating
Based on 188 reviews
5 stars
57.4% (108)
4 stars
25.0% (47)
3 stars
9.0% (17)
2 stars
3.7% (7)
1 star
4.8% (9)
Showing 188 reviews
Verified Only
Sort by: Newest First
Charles C
VerifiedJuly 30, 2020 Stayed at: B016, Loop: FLAT
Restrooms clean, camp site spacious, lots of shade at most sites. Be prepared for street noise since it is just off of the highway.
Helpful
Greg G
VerifiedJuly 26, 2020 Stayed at: B006, Loop: FLAT
I have camped in that area for many years. This was the worst campground hostess we have ever had. She not once said hello to me or my family. When we arrived there was no one in the campground host campsite. After we parked our trailer, we discovered smoke and a smoldering campfire and trash in the pit in our site. There was trash in the site and the campground. The campground had obviously not been cared for. We were there almost a week and never did we see the campground host care for any site or the campground itself. We went to throw our trash away and the host was walking her dogs. We found the trash was full so my wife asked when they would be emptied, and she never did answer.
Helpful
Greg G
VerifiedJuly 26, 2020 Stayed at: B006, Loop: FLAT
I have camped in that area for many years. This was the worst campground hostess we have ever had. She not once said hello to me or my family. When we arrived there was no one in the campground host campsite. After we parked our trailer, we discovered smoke and a smoldering campfire and trash in the pit in our site. There was trash in the site and the campground. The campground had obviously not been cared for. We were there almost a week and never did we see the campground host care for any site or the campground itself. We went to throw our trash away and the host was walking her dogs. We found the trash was full so my wife asked when they would be emptied, and she never did answer.
Helpful
Lisa J
VerifiedJanuary 17, 2020 Stayed at: B017, Loop: FLAT
Nice campground. Some road noise. Camp hostess was anything but welcoming.
Helpful
Lisa J
VerifiedJanuary 17, 2020 Stayed at: B017, Loop: FLAT
Nice campground. Some road noise. Camp hostess was anything but welcoming.
Helpful
Lee H
VerifiedJanuary 16, 2020 Stayed at: B011, Loop: FLAT
nice clean place to camp
Helpful
Frank H
VerifiedJanuary 16, 2020 Stayed at: B015, Loop: FLAT
We love Island Park, and we love Flat Rock campground. Level, clean sites. Easy access to water. Clean bathrooms, friendly camp hosts. Close to Big Spring and river floating access.
Helpful
Lee H
VerifiedJanuary 16, 2020 Stayed at: B011, Loop: FLAT
nice clean place to camp
Helpful
Frank H
VerifiedJanuary 16, 2020 Stayed at: B015, Loop: FLAT
We love Island Park, and we love Flat Rock campground. Level, clean sites. Easy access to water. Clean bathrooms, friendly camp hosts. Close to Big Spring and river floating access.
Helpful
Location & Directions for Flat Rock (Idaho)
Highway 20, Island Park, ID 83429 United States
Elevation: 1,962 ft
Getting There
From West Yellowstone, Montana, take U.S. Highway 20 south for 22 mi, or from Ashton, Idaho, take U.S. Highway 20 north for 30 mi. The campground entrance is 1/4 mi south of Macks Inn on the west side of the highway.
Highway access
The campground is accessible via U.S. Highway 20, which runs north and south with connections to West Yellowstone, Montana, and Ashton, Idaho.
Near Yellowstone National Park
The closest entrance is: West Entrance
Approximate drive: 20.2 mi · 35 min
Policies & Rules
General
- Wildlife Caution
- Idaho OHV Safety Message
- A $7 fee for extra vehicles will be collected at the campground
- 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.
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Last updated: October 24, 2026
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Explore Island Park, ID
Population: 170
Nearby city: Idaho Falls, ID
Approx. 78 mi away (straight-line distance)
Elevation: 6,289 ft
Island Park, ID
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Managed by the USDA Forest Service