Montana State Parks · Montana
Lake Mary Ronan State Park
Montana State Parks · Montana, United States
- Sites
- 25
- Drinking water
- Yes
- Restrooms
- Yes
- Pets
- Yes
- Elevation
- 3,812 ft
- Dark sky
- Bortle class 1
- Cell coverage
- T-Mobile none · AT&T none · Verizon none (carriers' 4G LTE filings to the FCC, 2025-12; not measured here)
- Address
- 50623 Lake Mary Ronan Rd, Dayton, MT 59860
- Phone
- 406-849-5082
About
Lake Mary Ronan State Park is a Montana FWP state park with 25 campsites, some with seasonal electricity.
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 | 33° | 22° | -17° | 40° | 11 of 11 |
| February | 32° | 19° | -13° | 46° | 11 of 11 |
| March | 41° | 26° | 2° | 58° | 11 of 11 |
| April | 46° | 30° | 8° | 71° | 10 of 11 |
| May | 58° | 39° | 31° | 80° | 2 of 11 |
| June | 68° | 47° | 36° | 84° | 0 of 11 |
| July | 82° | 57° | 46° | 94° | 0 of 11 |
| August | 81° | 58° | 47° | 96° | 0 of 11 |
| September | 69° | 51° | 40° | 84° | 0 of 11 |
| October | 54° | 38° | 30° | 73° | 3 of 10 |
| November | 40° | 31° | 12° | 56° | 9 of 10 |
| December | 34° | 28° | 6° | 46° | 10 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
- Big Arm State Park · Montana State Parks · 9 mi · 41 sites
- West Shore State Park · Montana State Parks · 9 mi · 33 sites
- Wayfarers State Park · Montana State Parks · 17 mi · 30 sites
- Yellow Bay State Park · Montana State Parks · 17 mi · 5 sites
- Blue Bay Campground · Tribal Lands · 18 mi · 22 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.