St. Mary Falls is a smaller tiered waterfall in Montana, with a drop of about 35 ft.

The falls are fed by St. Mary River. It lies in Glacier County, Montana. The site is on public land managed by National Park Service (Glacier National Park).

This is a short hike waterfall: reached by a short trail, generally under about a mile each way. The walk to the main viewpoint runs about 2.4 miles round trip. The nearest town is St. Mary.

When to go: Late June through September. Like most waterfalls, St. Mary Falls runs highest after snowmelt or heavy rain and can thin out in late summer, so it's worth checking recent streamflow and the land manager's conditions page before a long drive.