Natural swimming hole
St. Mary Lake
Lake · Montana
Community-reported spot. Details below are compiled from public sources and are reported to be accurate — always verify locally before visiting.
About this swimming hole
Glacier's stunning alpine lake on the east side, with turquoise water and peaks. St. Mary Lake's shoreline works for a cold plunge. The scenery is world-class.
Good to know
| Water type | Lake |
|---|---|
| Water temperature | 40s-50s |
| Depth | glacial lake; shoreline swim |
| Best season | July-September |
| Fees | NPS park entrance |
| Reservations required | No |
| Hours | sunrise-sunset |
| Parking | NPS lots |
| County | Glacier County |
| Nearest town | St. Mary |
| Safety notes | No lifeguard; very cold |
Map
Nearby swimming holes
Frequently asked questions
Can you swim in St. Mary Lake?
Yes — St. Mary Lake is listed as a natural swimming spot in Montana. Reported water temperature: 40s-50s. Heads-up: No lifeguard; very cold. There are rarely lifeguards at natural swimming holes — verify conditions locally before you go.
Does St. Mary Lake require reservations?
No reservations are required at St. Mary Lake based on current information — but verify before you go.
Is there a fee to visit St. Mary Lake?
Reported fee info: NPS park entrance. Fees can change — confirm with the official link.
When is the best time to visit St. Mary Lake?
The best season is typically July-September.