Big Arm Unit - Flathead Lake State Park

Star4.52
84 reviews
28031 Big Arm State Park Rd., Big Arm, Montana, 59910, United States
Indigenous Heritage
Pet FriendlyScenic ViewsSwimmingSummer Destination

Real-Time Availability

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April 2026

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Quick Facts

2,982 ft

Price

$8 - $60/night

Booking

Reservable

Sites

40 campsites

Season

Camping season ends ...

Cell

Unknown

Pets

Very Pet Friendly

Top 2% in state

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Big Arm Unit - Flathead Lake State Park
$8.00 - $60.00 / night
Campsite Fees
Yurt rates range from $50 to $60 per night plus a $10 reservation fee. Entrance fee is $8 for out-of-state vehicles.
Standard Site Fee$0.00
Hookup Site Fee$0.00
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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What Campers Say

4.52

Top-Rated

Based on 84 reviews

332 Google reviews

Most mentioned

viewscleanshowerslake

"User reviews for Big Arm Unit at Flathead Lake State Park are overwhelmingly positive, with praise for its cleanliness, beautiful lake views, and friendly camp hosts. However, some users raised concerns about tight campsites and parking limitations."

Read all reviews

Campground Map

28031 Big Arm State Park Rd., Big Arm, Montana, 59910, United States

Big Arm Unit - Flathead Lake State Park

28031 Big Arm State Park Rd., Big Arm, Montana, 59910, United States

Nearby places
Polson (13 miles, approximately 20 minutes driving), null for other cities
Nearby supplies
Supplies such as firewood and ice are sold at the campground by camp hosts. Other grocery or supply locations are not specified.

Best Time to Camp at Big Arm Unit - Flathead Lake State Park

Summer brings daytime highs in the mid-60s to mid-70s with evenings in the 50s. Warm enough for swimming and boating but cool enough for campfires. Water temperatures rise enough for comfortable lake activities, and daylight stretches long. Sites book up fast during this season. Winter transforms the area with snowfall and freezing temperatures, though the campground remains open year-round. Autumn turns surrounding forests gold before the first snows arrive.

Best
Summer(Jun-Aug)
5.0 / 5
Top 3% in MT

Peak season for swimming, boating and sunbathing; many positive summer reviews.

Planning Tips

  • Peak Season: Exact peak season dates not specified.. Book 2-3 months ahead.
  • Operating Season: Camping season ends on November 1, exact reopening not specified.
  • Current Alerts: None mentioned.

About Big Arm Unit - Flathead Lake State Park

Big Arm Unit sits on the southwest shore of Flathead Lake. The largest natural freshwater lake west of the Mississippi. Within the Flathead Indian Reservation. The campground has 40 sites plus 3 yurts, with flush toilets, hot showers, and direct lake access. Sites fill quickly in summer when boat launches, swimming, and fishing draw the biggest crowds.
The campground accommodates tent camping, RVs, and yurt rentals. Sites are located along the shoreline and include accessible ADA-designated spots.

Best Campsites

Curated by campers, for campers
Reveal picks

Reserving a campsite

Check-in
2:00 PM
Check-out
1:00 PM
Stay Limit
Stay limits for general campsites are not explicitly mentioned.

Need help booking Big Arm Unit - Flathead Lake State Park?

Reservation tips, booking windows, and free cancellation alerts.


Amenities available

Showers
Potable water
Flush toilets
Fire rings
Picnic tables
Firewood available

Activities you can enjoy

The Big Arm Unit offers a wide range of recreational opportunities. Activities include swimming, sunbathing, boating, fishing, and hiking on the nature trail. The park is a popular launch point for boat trips to Wild Horse Island.
Hiking
Fishing
Swimming
Boating
Wildlife viewing
Beach activities
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Policies & Safety

Hazards & AlertsBear activity is noted; campers are advised to store food in airtight containers or cars. Some sites have inclined ground, which may affect sleeping comfort.
Active AlertsNone mentioned.

Weather at Big Arm Unit - Flathead Lake State Park

Trip Planning Tools

Reviews

From Booking Sources
4.5
84 reviews
Top-Rated
Top-Rated
Big Arm Unit - Flathead Lake State Park is top-rated, placing it in the top 15% of campgrounds based on reviews
User reviews for Big Arm Unit at Flathead Lake State Park are overwhelmingly positive, with praise for its cleanliness, beautiful lake views, and friendly camp hosts. However, some users raised concerns about tight campsites and parking limitations.
Review Summaries
Based on 84 reviews

What Campers Love

- Clean bathrooms and showers. - Friendly and helpful camp hosts. - Stunning lakeside views. - Easy access to the lake for swimming and boating. - Availability of firewood and ice on-site.
Based on 84 reviews

Common Concerns

- Limited parking at some sites, requiring campers to park on the roadway. - Some campsites are described as tight or crowded. - Flush toilets are located far from certain campsites. - Potential bear...
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Based on 84 reviews
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Last updated April 3, 2026
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Big Arm Unit - Flathead Lake State Park