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Big Arm State Park (Flathead Lake)

Big Arm, MT

Big Arm State Park (Flathead Lake)
Fee: Montana residents with state parks registration: no daily entrance fee. Nonresidents: $8 per vehicle, $4 walk-in/bicycle. Camping $4-$34 per night; yurts $54-$72 per night.

About this park

The Big Arm unit of Flathead Lake State Park sits on the lake's west shore, about 15 miles north of Polson. A long pebble beach and a mature forest of ponderosa pine and juniper frame views of the Swan and Mission ranges, and the unit is the jumping-off point for 2,163-acre Wild Horse Island. The campground has 41 campsites, including a wheelchair-accessible site and three yurts, and is open April through October. Day use is available year-round, with water and showers running mid-May through mid-September. Visitors can camp, hike, swim, fish, boat, bird watch, and photograph, and there is an archery range on site. Water sports are a big draw in summer, and the park's position on the largest natural freshwater lake in the western United States makes it a convenient base for exploring the Flathead Lake shoreline.

Contact & location

📞 (406) 837-3041
✉️ bigarm@mt.gov
📍 28031 Big Arm State Park Rd., Big Arm, MT, 59910

Nearby state parks

🌲Wild Horse Island State Park (Flathead Lake) · Bigfork · 4.7 mi
🌲Lake Mary Ronan State Park · Dayton · 9.0 mi
🌲Finley Point State Park (Flathead Lake) · Finley Point · 11.3 mi

Map

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Big Arm State Park (Flathead Lake) FAQ

Where is Big Arm State Park (Flathead Lake) located?
Big Arm State Park (Flathead Lake) is in Big Arm, Montana, at 28031 Big Arm State Park Rd.. GPS coordinates: 47.80534, -114.31339. Get directions.
Is there an entrance fee at Big Arm State Park (Flathead Lake)?
Montana residents with state parks registration: no daily entrance fee. Nonresidents: $8 per vehicle, $4 walk-in/bicycle. Camping $4-$34 per night; yurts $54-$72 per night. Fees can change by season, so confirm with the park before you go.
How do I contact Big Arm State Park (Flathead Lake)?
You can call (406) 837-3041 or email bigarm@mt.gov. The park office can confirm RV site availability, hookups, length limits and current conditions.
Are there RV campgrounds near Big Arm State Park (Flathead Lake)?
Yes. The closest RV-friendly campgrounds listed on ParkedRV are:Distances are straight-line miles.
How current is this information about Big Arm State Park (Flathead Lake)?
This listing was last updated on October 4, 2026. If something is out of date, let us know and we'll fix it.