Montana State Parks · Montana
Big Arm State Park
Montana State Parks · Montana, United States
- Sites
- 41
- Season
- April to October
- Max RV length
- 40 ft
- Group sites
- Yes
- Drinking water
- Yes
- Restrooms
- Yes
- Showers
- Yes
- Pets
- Yes
- Elevation
- 2,979 ft
- Dark sky
- Bortle class 1
- Cell coverage
- T-Mobile good · AT&T good · Verizon good (carriers' 4G LTE filings to the FCC, 2025-12; not measured here)
- Address
- 28031 Big Arm State Park Rd., Big Arm, MT 59910
- Phone
- 406-849-5256
Site map
The imagery of the campground. Press and hold the map to drop your own pins and notes; the operator publishes no site points here. Your ratings, notes, pins and photos are kept with the campground on your Saved list, the same list the camping map and the drive page keep.
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About
Big Arm State Park, one of Flathead Lake State Park's five mainland units, is a Montana FWP state park with 41 campsites including a group site and three yurts.
Fees
Montana FWP's statewide camping rate: $4-$34 per night, depending on season and available amenities. Plus Montana's day-use entrance fee (in addition to the nightly camping rate): Montana residents who pay the $9 state parks fee with vehicle registration owe no daily entrance fee; nonresidents pay $8/vehicle or $4/walk-in per day (or $50/year for a Nonresident Entrance Pass, $35 for a 7-day pass). A 50% camping-fee discount applies statewide to Montana-resident seniors (62+), veterans and people with disabilities.
Weather, month by month
| Month | Typical high | Typical low | Coldest night | Hottest day | Years with a night below 32°F |
|---|---|---|---|---|---|
| January | 35° | 25° | -14° | 42° | 11 of 11 |
| February | 34° | 22° | -8° | 49° | 11 of 11 |
| March | 43° | 30° | 6° | 60° | 11 of 11 |
| April | 49° | 34° | 15° | 73° | 6 of 11 |
| May | 62° | 42° | 35° | 83° | 0 of 11 |
| June | 71° | 51° | 39° | 87° | 0 of 11 |
| July | 85° | 62° | 50° | 97° | 0 of 11 |
| August | 84° | 63° | 49° | 99° | 0 of 11 |
| September | 72° | 54° | 43° | 87° | 0 of 11 |
| October | 57° | 40° | 32° | 75° | 0 of 10 |
| November | 43° | 33° | 17° | 59° | 6 of 10 |
| December | 36° | 31° | 8° | 49° | 9 of 10 |
Mid-month figures from 2016–2026 of daily weather at this spot (ERA5 reanalysis via Open-Meteo, CC BY 4.0), in °F. Typical is the median; coldest and hottest are the extremes seen.
Nearby campgrounds
- Lake Mary Ronan State Park · Montana State Parks · 9 mi · 25 sites
- Finley Point State Park · Montana State Parks · 11 mi · 29 sites
- West Shore State Park · Montana State Parks · 12 mi · 33 sites
- Blue Bay Campground · Tribal Lands · 13 mi · 22 sites
- Yellow Bay State Park · Montana State Parks · 14 mi · 5 sites
All public campgrounds in Montana · Every state and province · Facts read from the operator 2026-08-25. Confirm fees, rules and current status with the operator before you go.