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State Park

Photo: Via Recreation.govPublic domainRecreation.gov

Verify with the state park system

State parks set their own rules and reservation systems. Fire bans, road closures, and operating dates change seasonally — check the state park website before traveling.

Directions

77

Total Sites

0.0

0 Reviews

76 Tent20 RV1 Group

Official sources & verification

Managed by State Park

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Source of truth

Verify by phone or mail

We display cached information from agency feeds. Hours, fees, permits, closures, fire restrictions, and conditions change without notice. Outdoors is not the permitting authority. Confirm current conditions for this campground using the links above before you go — you are responsible for compliance. Last verified by us: Aug 8, 2026. Our copy is more than a month old — please reconfirm with the agency before relying on it.Spot an error in our data?

Live availability

via Recreation.gov
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Availability is a recent snapshot, not a live hold — you always complete the booking on recreation.gov.

About

Overview 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. 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. Facilities 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. 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. Nearby Attractions 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.

Reviews

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How busy it gets

Recreation.gov
Well reviewed4.6

117 camper reviews on Recreation.gov

Amenities

Flush Toilets
Potable Water
Electric Hookups
Firewood
Picnic Tables
Fire Rings
Trash Service
Cell Service

Cell reception

Camper reports · checked Sep 29, 2026

Some Coverage

Average 2.0 of 4 bars · 97 reports across 3 carriers

Phone calls may occasionally drop; text messages may be delayed. Data service may be unusable. Drop-outs are common and it may be necessary to search for signal. Social media likely unusable.

  • Verizon

    Some Coverage

    1.9/4

    52 reports

  • AT&T

    Good Coverage

    2.5/4

    23 reports

  • T-Mobile

    Some Coverage

    1.6/4

    22 reports

Reported by campers on Recreation.gov, not measured by us. Reception varies by handset, weather, and where you stand in the campground. Recreation.gov

Check-in & Check-out

Check-in 2:00 PM

Check-out 12:00 PM

Campground Rules

  • Campfires generally permitted — verify current fire restrictions before lighting

Reservations

This campground accepts reservations. Book early for popular dates.

Make a Reservation

Individual Sites (77)

027
#027

027

Loop B

Check official pricing Max 8 guests45 ft
CampsiteStandardPull-through
Reserve
028
#028

028

Loop B

Check official pricing Max 8 guests50 ft
CampsiteStandardPull-through
Reserve
029
#029

029

Loop B

Check official pricing Max 8 guests45 ft
CampsiteStandardPull-through
Reserve
030
#030

030

Loop B

Check official pricing Max 8 guests45 ft
CampsiteStandardPull-through
Reserve
031
#031

031

Loop B

Check official pricing Max 8 guests45 ft
CampsiteStandardPull-through
Reserve
032
#032

032

Loop B

Check official pricing Max 8 guests45 ft
CampsiteStandardPull-through
Reserve

In this park

Trails at Targhee National Forest

View park

Within ~30 miles

Trails near Buttermilk

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Hunt context

Hunting units around this campground

During hunting seasons, wear blaze orange and check regulations — see the Idaho hunting page

Nearby Campgrounds

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