Mammoth Campground
Yellowstone National Park · Wyoming · 81 sites
Photos: National Park Service via Recreation.gov
Overview
Mammoth Campground is a National Park Service campground in Yellowstone National Park, Wyoming, with 81 sites in 4 loops. Mostly open: only a few shady sites. Verizon at 39 of 81, AT&T at 8 of 81; T-Mobile reports none.
10 of 81 sites shaded
63 of 81 sites in full sun
81 of 81 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 Mammoth Campground are the shadiest?
Only a few. 10 of 81 sites have good shade; most sit in the open.
See the tree canopy in RoamWhich sites at Mammoth Campground get the most sun?
Plenty. 63 of 81 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 Mammoth Campground?
Easy here. All 81 sites have open sky for a Starlink dish. 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 Mammoth Campground are the most level?
4 of 81 sites are flat, and 11 more have a gentle slope most RVs can level with blocks; 66 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 Mammoth Campground have cell service?
Patchy. Verizon at 39 of 81; AT&T at 8 of 81; 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 Mammoth Campground in October?
In October, expect highs around 54°F and lows around 28°F, with about 1.5 inches of rain over the month and 5 inches of snow. Every month’s averages are in Roam Premium.
Open Mammoth in RoamCampground facts
- Sites
- 81 in 4 loops
- Kinds
- 64 for RVs or trailers · 17 tent-only
- Hookups
- None
- Longest rig
- 40 ft
- Accessible
- 5 sites
- Elevation
- 5,996–6,069 ft
- Amenities
- Amphitheater, Flush toilets, Food storage lockers, Recycling, Water spigots
- Every site
- Drive-in · Pets allowed · Check-in 10 AM, check-out 10 AM
- 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: “Mammoth Campground offers: 82 campsites Some Cell Phone Reception Food Storage Lockers Trash/Recycling Collection Amphitheater - Seasonal Staff or Volunteer Host On Site - Seasonal Potable Water spigots Flush Toilets - year round There are no showers at the campground The Mammoth Campground is in a high sagebrush steppe, scattered juniper and Douglas fir trees provide shade during hot summer months. Wildlife including elk, bison, pronghorn, and mule deer frequent the Mammoth Hot Springs and the North area of the park, depending on the season. The road from the North Entrance to the Mammoth Campground winds up the Gardner River canyon, past crumbling walls of sandstone and ancient mudflows.”
Page data as of October 15, 2026. Full source notes are in each layer’s info in the app.