Headwaters Campground at Flagg Ranch
Grand Teton National Park · Wyoming · 165 sites
Photos: National Park Service via Recreation.gov
Overview
Headwaters Campground at Flagg Ranch is a National Park Service campground in Grand Teton National Park, Wyoming, with 165 sites in 7 loops. Mostly shady: most sites have good shade. Verizon and AT&T report coverage at every site; T-Mobile reports none.
124 of 165 sites shaded
22 of 165 sites in full sun
122 of 165 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
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Questions
Which sites at Headwaters Campground at Flagg Ranch are the shadiest?
Most of them. 124 of 165 sites have good shade, much of it from the afternoon sun; the other 41 are more open.
See the tree canopy in RoamWhich sites at Headwaters Campground at Flagg Ranch get the most sun?
Only a few. 22 of 165 sites are truly sunny and 40 more get some sun; the rest are shaded.
See the tree canopy in RoamWill Starlink work at Headwaters Campground at Flagg Ranch?
Easy here. About 122 of 165 sites have open sky for a Starlink dish, and 32 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 Headwaters Campground at Flagg Ranch are the most level?
82 of 165 sites are flat, and 62 more have a gentle slope most RVs can level with blocks; 21 are steeper, better for tents. Sites that take RVs or trailers fit rigs up to 45 ft.
See the slope at each site in RoamDoes Headwaters Campground at Flagg Ranch 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 Headwaters Campground at Flagg Ranch in October?
In October, expect highs around 49°F and lows around 26°F, with about 2.5 inches of rain over the month and 9 inches of snow. Every month’s averages are in Roam Premium.
Open Headwaters at Flagg Ranch in RoamCampground facts
- Sites
- 165 in 7 loops
- Kinds
- 132 for RVs or trailers · 33 tent-only
- Hookups
- 94 with electric
- Longest rig
- 45 ft
- Elevation
- 6,837–6,845 ft
- Amenities
- Accessible flush toilets, Accessible showers, Amphitheater, Camp host, Drinking water, Firewood for sale, Flush toilets, Recycling, Showers, Trailhead access, Trash collection, Water spigots
- Every site
- Drive-in · Pets allowed · Campfires allowed · Check-in 2 PM, check-out 11 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: “Headwaters campground offers camping for tents, full-hookup camping for RVs, and hard-wall Camper Cabins. Each tent site has a gravel parking space for up to two vehicles, and tent pads for up to two tents. All RV sites are pull-through with gravel parking space for one RV and one tow vehicle with a maximum total length of 45 feet. Our RV sites offer full-hookups including sewer, water, and 20-, 30-, and 50-amp electric outlets. Propane is available for purchase at the campground office. Headwaters Camper Cabins are scattered throughout the campground and include double-double or double-single bunk-style beds. While the bunks are padded, bedding and pillows not included. Headwaters at Flagg Ranch is situated in a tranquil setting along the upper reaches of the Snake River, surrounded by meadows and conifer forests. The Yellowstone Plateau rises to the north, and Huckleberry Mountain to the east. Within walking distance is Polecat Creek, which runs through forests, wildflower meadows, and thermal features. For avid anglers, the Snake River offers plentiful cutthroat trout, brook trout, and whitefish.”
Page data as of October 15, 2026. Full source notes are in each layer’s info in the app.