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

Buttermilk

Buttermilk Campground is located approximately 30 miles southwest of West Yellowstone, Montana and 32 miles north of Ashton, Idaho in beautiful Island Park, Idaho. Buttermilk sits next to Island Park Reservoir at an elevation of 6,200 feet. Visitors love Island Park for its world-class fishing and outstanding scenery and wildlife viewing opportunities.

More like this: electric hookups in Idaho · reservable in Idaho · big rigs in Idaho · pets allowed in Idaho · group sites in Idaho

Check availability on Recreation.gov ↗
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Photos via Recreation.gov

Site mix

Standard, no hookups19
Standard with electric1
Group sites1
Host/management35
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 50 feet of vehicle capacity. Most sites are shorter.

Have the trailer VIN? It carries the trailer length.

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

SiteTypeEntryFits, ftSurfaceShadePowerPeople / vehiclesFires
027StandardPull-through45GravelPartialNo8 / 1
028StandardPull-through50GravelPartialNo8 / 1
029StandardPull-through45GravelPartialNo8 / 1
030StandardPull-through45GravelPartialNo8 / 1
031StandardPull-through45GravelPartialNo8 / 1
032StandardPull-through45GravelPartialNo8 / 1
033StandardPull-through45GravelPartialNo8 / 1
034Standard45GravelPartialNo8 / 1
035StandardBack-in50GravelPartialNo16 / 2
036StandardBack-in45GravelPartialNo8 / 1

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, water
Max vehicle length50 ft
EquipmentRVs & trailers, Tents
PetsAllowed
CampfiresAllowed, subject to restrictions
FeesGroup Site Fees: $65.00 per night Sunday through Thursday and $130.00 per night Friday and Saturday. A weekly rate is not available.

The campground contains two loops for single family camping and one loop for group camping, with a total of 55 sites. The large group site can accommodate up to 150 people. Site 038 has 15-amp electric hookups. Vault toilets and drinking water are provided. A concrete boat ramp with docks is located between the group camping and single family camping loops. Access to the campground is on a paved road but the interior loop roads and parking spurs are gravel.

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

Season & status

StatusClosed for the season. Forest Service sites close for the season; check the official page for the reopening date.
SeasonMay
ForestCaribou-Targhee National Forest
BookingSome of these campsites can be reserved by calling Toll Free 1-877-444-6777 or Buttermilk, Caribou-Targhee National Forest - Recreation.gov
FeesSingle Site $ 25.00. Double Site $ 50.00. Group Area (Sun.-Thurs.) $ 100.00. Group Area (Fri.-Sat.) $ 200.00. Extra Vehicle (ea.) $ 7.00
RulesNo All Terrain Vehicles (ATVs) or Off-HighwayVehicles (OHVs) allowed in the park.

Caribou-Targhee National Forest recreation page ↗

Weather by month

NOAA climate normals →
Weather by month near Buttermilk10°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, 3 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 Highway 20 south, southwest for approximately 25 miles and from Ashton, Idaho, take Highway 20 north for approximately 27 miles. Turn west onto the Kilgore-Yale Road #030 (across from Elk Creek Gas Station) and go about 2 miles to the Buttermilk Loop Road #126.

Nearest townIsland Park, Idaho
Coordinates44.4325° N, 111.4261° W · Directions ↗

Supplies & services

Dump stationDump station ↗22.1 mi
Outdoor gearEagle's Curios ↗22.4 mi

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

Explore

Video

A Photographic Tour of Buttermilk Campground in Eastern Idaho

Worth a stop

Mesa Falls Scenic Byway is 13 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 15 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 18 miles north, offering fishing, a fish cleaning station and boat ramp. Yellowstone National Park's west entrance is just 29 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.

  • 0.2 mi
    Lakeside Trail E
    0.9 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 0.3 mi
    Lakeside Trail D
    0.7 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 0.7 mi
    Buttermilk Trail
    1.3 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 1.2 mi
    Mill Creek Trail A
    0.7 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 1.2 mi
    Lakeside Trail
    1.5 mi trail · hiking, horse, bike, motorcycle and 2 more
  • 1.8 mi
    Mill Creek Trail B
    0.7 mi trail · hiking, horse, bike, motorcycle and 2 more

Trailheads within three miles

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. The campground is situated in a forest of lodgepole pine, which provides partial shade in some sites. Some areas of the campground are more open and sunny than others.

Recreation

The Island Park area is prized for its fishing; the Henry's Fork is known as one of the nation's best fly-fishing streams. Anglers cast for rainbow, cutthroat and brook trout and Kokanee salmon. Island Park Reservoir offers boating, water skiing and excellent fishing opportunities. The reservoir is used for irrigation so the water level recedes throughout the summer, but is generally useable all season. Henry's Lake is nearby. Hiking, biking, horseback riding and ATVing are popular activities. Many miles of trails are in the area, including the Continental Divide National Scenic Trail and the Nez Perce Trail. The Big Springs National Recreation Water Trail offers an approximately three-hour float or canoe trip through beautiful scenery. Wildlife, including moose, bald eagles and Sandhill cranes, are often seen along the trail.

Guidebooks for Idaho

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

Reference

Questions people ask

Do I need a reservation at Buttermilk?

Sites at Buttermilk are reservable on Recreation.gov. Some of these campsites can be reserved by calling Toll Free 1-877-444-6777 or Buttermilk, Caribou-Targhee National Forest - Recreation.gov Any walk-up sites are listed on the booking page.

Source: Recreation.gov

How much does it cost to camp at Buttermilk?

Group Site Fees: $65.00 per night Sunday through Thursday and $130.00 per night Friday and Saturday. A weekly rate is not available.

Source: Recreation.gov

What time is check-in at Buttermilk?

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

Source: Recreation.gov

Is Buttermilk open right now?

Closed for the season as of Oct 16, 2026. Season May.

Source: Forest Service status

How many sites does Buttermilk have?

56 sites, including 19 standard sites without power, 1 standard site with power, and 1 group site.

Source: Recreation.gov

Will my RV fit at Buttermilk?

The longest site here provides 50 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 Buttermilk have hookups?

Yes, electric and water hookups at some sites.

Source: Recreation.gov

Are pets allowed at Buttermilk?

Yes, pets are allowed at Buttermilk. Leash rules apply.

Source: Recreation.gov

Can I have a campfire at Buttermilk?

Fires are allowed in the provided rings under normal conditions. No All Terrain Vehicles (ATVs) or Off-HighwayVehicles (OHVs) allowed in the park.

Source: Recreation.gov

Is there cell service at Buttermilk?

FCC coverage maps show Verizon 4G LTE, AT&T 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 Buttermilk?

The Island Park area is prized for its fishing; the Henry's Fork is known as one of the nation's best fly-fishing streams. The Recreation section on this page has the rest.

Source: Recreation

What is the nearest town to Buttermilk?

Island Park, Idaho. Mesa Falls Scenic Byway is 13 miles south of the campground.

Source: Getting there