St. Mary Campground
Glacier National Park · Montana · 142 sites
Photos: National Park Service via Recreation.gov
Overview
St. Mary Campground is a National Park Service campground in Glacier National Park, Montana, with 142 sites in 4 loops. Mostly open: only a few shady sites. Verizon and AT&T report coverage at every site; T-Mobile reports none.
27 of 139 sites shaded
106 of 139 sites in full sun
131 of 139 sites with clear sky
Map of the campground
Every site from the Recreation.gov listing. Choose a layer to see it across the campground; tap a site to open it in Roam.
Layers
More in Roam Premium
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Questions
Which sites at St. Mary Campground are the shadiest?
Only a few. 27 of 139 sites have good shade; most sit in the open.
See the tree canopy in RoamWhich sites at St. Mary Campground get the most sun?
Plenty. 106 of 139 sites are open to the south and the sky — easy for solar panels, and warm on cool mornings.
See the tree canopy in RoamWill Starlink work at St. Mary Campground?
Easy here. About 131 of 139 sites have open sky for a Starlink dish, and 1 more have a partial gap. Satellite texting on a phone needs less open sky, but still works best from the most open spot you can find. This is our estimate from tree heights — check with the Starlink app's obstruction check when you arrive.
See the tree canopy in RoamWhich sites at St. Mary Campground are the most level?
15 of 139 sites are flat, and 40 more have a gentle slope most RVs can level with blocks; 84 are steeper, better for tents. Sites that take RVs or trailers fit rigs up to 40 ft.
See the slope at each site in RoamDoes St. Mary Campground have cell service?
Mostly. Verizon and AT&T report coverage at every site; T-Mobile reports none. That's the coverage each carrier reports to the FCC, not a measured signal, so under trees or below a ridge it can be weaker.
See the coverage map in RoamWhat’s the weather like at St. Mary Campground in October?
In October, expect highs around 50°F and lows around 30°F, with about 2.3 inches of rain over the month and 1 inch of snow. Every month’s averages are in Roam Premium.
Open St. Mary in RoamCampground facts
- Sites
- 142 in 4 loops
- Kinds
- 126 for RVs or trailers · 15 tent-only · 1 group site
- Hookups
- None
- Longest rig
- 40 ft
- Accessible
- 2 sites
- Elevation
- 4,493–4,552 ft
- Every site
- Pets allowed
- Managed by
- National Park Service
- Booking
- Reserve on Recreation.gov
How we know Sources and limits
Shade, sun and Starlink are our estimates from Meta and the World Resources Institute’s canopy-height model (about 2 m pixels, from satellite imagery calibrated with space lidar; CC BY 4.0). From 2 m above each site we trace 72 lines out to 60 m and note the tallest tree in each direction. Shade counts trees overhead, the canopy within 30 m and how much of the afternoon sky is blocked. Sun counts how open the southern sky is. Starlink needs open sky above 35°, with the northern half counted twice because US dishes tilt north, and we keep the best spot within 8 m of the site’s post. The model sees tree heights only, not trunks, buildings or hills, so check with the Starlink app when you arrive.
Slope is the ground at each site’s post over about 4 m, from USGS 3DEP 1 m lidar: level under 2%, gentle to 4% (most rigs level on blocks), sloped to 8% (fine for a tent), steep beyond.
Cell coverage is from the FCC Broadband Data Collection (carrier filings as downloaded May 2026): each site is tested against each carrier’s modelled outdoor 4G/5G coverage. It is what the carriers report, not a measured signal.
Weather is NOAA’s 1991–2020 climate normals for the campground. Sites and facts are from Recreation.gov’s open data (July 2026). Map imagery: USGS The National Map. Photos: Recreation.gov.
From the campground’s Recreation.gov listing: “Potable water is accessible in the campground, and restroom facilities provide flush toilets and sinks with running water. A couple of miles down the road and outside the park, visitors will find all the comforts of home, including restaurants, gift shops, camp stores, gas and groceries. Though shade is sparse, the aspen trees that grace St. Mary Campground flutter in spring and summer breezes and provide colorful splashes of yellow late in the season. Views of Singleshot, East Flattop and Red Eagle Mountains provide a dramatic backdrop to the landscape. St. Mary Lake which, although too cold and occasionally too rough to swim in, provides refreshing scenery on warm days.”
Page data as of October 15, 2026. Full source notes are in each layer’s info in the app.