Photo: NPS Photo (Diane Renkin)Public domainRecreation.gov
Mammoth Campground (yellowstone)
Yellowstone National Park · Yellowstone National Park, WY
Verify with the state park system
State parks set their own rules and reservation systems. Fire bans, road closures, and operating dates change seasonally — check the state park website before traveling.
Official sources & verification
Managed by State Park
Source of truth
- Agency source page
The page our published rules and notes are derived from.
Reserve or permit
- Reserve on Recreation.gov
Book a site directly with the operator.
Verify by phone or mail
- Operator:307-344-2107
- Email:YELL_visitor_services@nps.gov
- Address:Yellowstone National Park · Yellowstone National Park, WY · 82190
Live availability
via Recreation.govAvailability is a recent snapshot, not a live hold — you always complete the booking on recreation.gov.
About
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How busy it gets
Recreation.gov809 camper reviews on Recreation.gov
Books out
95% booked
5,832 of 6,142 released site-nights were already reserved · Aug 2026 – Oct 2026 · busiest Aug 2026 at 100%
Aug
100%
Sep
100%
Oct
74%
Share of nights Recreation.gov had released for online booking that were already reserved when we checked. Walk-up sites, closures, and nights outside the booking window are excluded.
Amenities
Cell reception
Camper reports · checked Sep 29, 2026Some Coverage
Average 1.6 of 4 bars · 624 reports across 3 carriers
Phone calls may occasionally drop; text messages may be delayed. Data service may be unusable. Drop-outs are common and it may be necessary to search for signal. Social media likely unusable.
Verizon
Some Coverage
2.4/4
312 reports
AT&T
Major Issues
1.0/4
158 reports
T-Mobile
Major Issues
0.8/4
154 reports
Reported by campers on Recreation.gov, not measured by us. Reception varies by handset, weather, and where you stand in the campground. Recreation.gov
Check-in & Check-out
Check-in 10:00 AM
Check-out 10:00 AM
Park Regulations
Overnight camping or parking is only allowed in designated campgrounds or campsites. Campsite occupancy is limited to six people per site. Checkout time is 10 am. Camping is limited to 14 days from July 1 through Labor Day, and 30 days for the rest of the year. There is no stay limit at the Fishing Bridge RV Park. Unless posted otherwise, wood and charcoal fires are permitted in all campgrounds except the Fishing Bridge RV Park. Propane grills and stoves are usually unaffected by fire restrictions. All odorous items that may attract bears, including food, cooking gear, toiletries, and garbage, must be kept secured when not in use. Bear-proof storage boxes are available at many campsites. Where permitted, generators may only be operated from 8 am to 8 pm (60 dB limit). Generators are not permitted at Indian Creek, Lewis Lake, Pebble Creek, Slough Creek, or Tower Fall.
Published by the National Park Service. Rules change seasonally and by area within a park — confirm current regulations with the agency before you go.
Campground Rules
- Campfires generally permitted — verify current fire restrictions before lighting
Individual Sites (87)
Mammoth Campground (Yellowstone) Scan and Pay
Loop Scan and Pay
Mammoth site #10
Loop A
Mammoth site #11
Loop A
Mammoth site #12
Loop A
Mammoth site #13
Loop A
In this park
Trails at Yellowstone National Park
Within ~30 miles
