Flat Rock (Idaho)

Star4.42
89 reviews
HIGHWAY 20, ISLAND PARK, ID 83429, USA

Quick Facts

6,400 ft

Price

$25 - $62/night

Booking

Reservable

Sites

74 campsites

Season

Open from May 23 thr...

Cell

Unknown

Pets

Check Policy

RV FriendlyElectricShowers

Opens Aud & Di Campground Services site

Official Website
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Real-Time Availability

Select a month, then check for open campsites

January 2026

Real-Time Availability

Select a month, then check for open campsites

January 2026
Flat Rock (Idaho)
$25.00 - $62.00 / night
Campsite Fees
The campground charges $31-$62 per night for electric hookup sites and $25 per night for non-electric sites during the peak season (May 23 -...
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Standard Site Fee$25.00
Hookup Site Fee$62.00
Premium Site Fee$0.00
Hike and Bike Site Fee$0.00
Group Site Fee$0.00
Food Storage Locker Fee$0.00

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Provider
208-558-7658 OR 208-270-0094
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What Campers Say

4.42

Recommended

Based on 89 reviews

Most mentioned

viewscleanspaciousfriendly

Some mention

noiseroad noise

"Flat Rock Campground has a mixed reception, with many campers praising its cleanliness, spacious sites, and friendly hosts, while others note issues with noise from the nearby highway and inconsistent host behavior."

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Campground Map

HIGHWAY 20, ISLAND PARK, ID 83429, USA

Flat Rock (Idaho)

HIGHWAY 20, ISLAND PARK, ID 83429, USA

Driving directionsFrom 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.
Flat Rock Campground is adjacent to U.S. Highway 20, making it easily accessible. However, reviews consistently note the proximity to the highway as a source of significant road noise. All interior roads and parking spurs are gravel.
Nearby places
West Yellowstone, MT (22 miles, approximately 20-minute drive)
Ashton, ID (30 miles, approximately 30-minute drive)
Island Park Reservoir and Henry's Lake are nearby.
Nearby supplies
Supplies can be obtained at Macks Inn, located directly across the highway, offering boat rentals, shuttle services, showers, laundry facilities, gas, and groceries.

Best Time to Camp at Flat Rock (Idaho)

Perched at 6,400 feet in the Rocky Mountains, Flat Rock Campground enjoys delightfully cool summers that offer a refreshing escape from valley heat. Daytime temperatures typically hover in the comfortable 70s, while evenings invite cozy campfires as temperatures dip into the crisp 40s and 50s. Winter transforms this landscape into a snow-laden wonderland, though the campground becomes inaccessible as heavy snowfall and sub-zero temperatures dominate from November through April. The shoulder seasons bring their own magic, with wildflower blooms in late spring and golden aspen displays in early fall.

Best
Summer(Jun-Aug)
4.0 / 5

Open peak season; cool summers, many activities, and positive summer reviews noted.

Fall(Sep-Nov)
3.0 / 5

Open into mid-September; early fall pleasant but season ends mid-month limiting full fall appeal.

Spring(Mar-May)
3.5 / 5

Opens May 23; spring reviews positive for river access and floats though season starts late spring.

Winter(Dec-Feb)
Not recommended

Campground closed outside May 23–Sep 14; winter camping not supported on-site.

Planning Tips
  • Peak Season: May 23 - September 14.. Book 2-3 months ahead.
  • Operating Season: Open from May 23 through September 14 (reservable season) annually.
  • Current Alerts: No current alerts explicitly mentioned.

About Flat Rock (Idaho)

Nestled in the heart of Island Park, Idaho, Flat Rock Campground offers an authentic wilderness escape just 22 miles south of the famed West Yellowstone gateway. This scenic retreat along the Henry's Fork of the Snake River provides the perfect basecamp for exploring the Greater Yellowstone ecosystem. Well-appointed with essential amenities including vault toilets, fresh drinking water, and regular trash collection, the campground features sturdy gravel roads and spacious parking spurs that welcome everything from compact cars to full-size RVs. Its convenient location along U.S. Highway 20 makes it easily accessible while still maintaining that coveted off-the-beaten-path feel.
Flat Rock Campground accommodates a range of camping setups with options for tent camping, RVs, and electric sites. No options for primitive or luxury camping are specified.
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Reserving a campsite

Check-in
Check-in is allowed from 11:00 AM.
Check-out
Check-out is by 12:00 PM.
Stay Limit
You may stay up to 14 nights during a visit at this campground.

Amenities available

Showers
Potable water
Electricity hookups
Fire rings
Picnic tables
Vault toilets

Activities you can enjoy

Flat Rock Campground offers a variety of recreational activities for outdoor enthusiasts. 'Henry's Fork has great fly-fishing for rainbow and brook trout.' The Big Springs National Recreation Water Trail allows for a scenic three-hour float. Activities like tubing, canoeing, kayaking, and rafting are popular on the river. Hiking, biking, horseback riding, and ATVing are also available, with many trails crisscrossing the Island Park area. Nearby reservoirs and lakes enhance the experience with boating, water skiing, and fishing.
HikingThe campground is located near the 2.5-mile Coffee Pot Rapids Trail and other major trails such as the Continental Divide National Scenic Trail and the Nez Perce Trail.
FishingFishing is a major draw with opportunities to catch rainbow and brook trout at Henry's Fork. Additional nearby fishing spots include the Island Park Reservoir and Henry's Lake.
BikingBiking is a popular activity, with trails in the surrounding Island Park area.
BoatingBoating opportunities are available at nearby Island Park Reservoir and Henry's Lake, which offer water skiing and excellent fishing. Canoeing and kayaking are popular on Henry's Fork.
Wildlife viewingWildlife such as moose, bald eagles, and Sandhill cranes can often be seen along the Big Springs National Recreation Water Trail.
Winter Activities
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Policies & Safety

Hazards & AlertsCommon hazards include road noise from U.S. Highway 20, potential encounters with wildlife such as bears, and seasonal fire restrictions.
Active AlertsNo current alerts explicitly mentioned.

Weather at Flat Rock (Idaho)

Reviews

4.4
89 reviews
Recommended
Recommended
Flat Rock (Idaho) is recommended, placing it in the top 40% of campgrounds based on reviews
Flat Rock Campground has a mixed reception, with many campers praising its cleanliness, spacious sites, and friendly hosts, while others note issues with noise from the nearby highway and inconsistent host behavior.
Review Summaries
Based on 89 reviews

What Campers Love

Cleanliness of campsites and vault toilets, spacious and level sites, friendly and helpful hosts, close proximity to recreational activities, and excellent fishing opportunities. Many reviews commend...
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Based on 89 reviews

Common Concerns

Complaints include road noise from the adjacent U.S. Highway 20, negative experiences with specific hosts, and occasional trash management issues. Some users also found the campground difficult to...
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Based on 89 reviews

Pro Tips & Recommendations

Bring earplugs for highway noise. Book early, as reservations fill up quickly. Use Macks Inn for additional amenities like showers and laundry. Consider nearby Upper Coffee Pot Campground for a...
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Based on 89 reviews

Seasonal Insights

Summer reviews highlight the campground's proximity to Yellowstone National Park and the pleasant outdoor activities available. However, road noise and the campground's popularity during peak seasons...
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Based on 89 reviews

Camper Quotes

1. 'The campground was great, just all the rain and weather made it good.' - LEON B. 2. 'Nice wide level campsite. Access road is dirt, so some dust.' - BRYAN P. 3. 'The camp host Dan and Annie...
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Based on 89 reviews

Site-Specific Reviews

Site B006 received both positive ('very clean and quiet') and negative ('trash in the pit, campfire smoldering') feedback. Site B008 was frequently mentioned as spacious and clean. Road noise was...
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Based on 89 reviews

Accessibility Features

No specific user reviews addressing accessibility features were available.
Based on 89 reviews

Pet-Friendly Features

Reviews generally do not mention pet-specific policies, but one user appreciated the campground's dog-friendly atmosphere and walkable distance to Mack's Inn.
Based on 89 reviews

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Last updated January 13, 2026
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