Yellowstone National Park · Wyoming
Mammoth Campground (Yellowstone) — how to get a site when it's sold out
Overview Starting Tuesday April 15th, the Mammoth Campground is open and reservations are required. For reservations at the campgrounds managed by Yellowstone National Park Lodges (Fishing Bridge RV Park, Bridge Bay, Canyon, Madison, and Grant Village campgrounds), please visit the Yellowstone National Park Lodges Camping website. Recreation There are many recreational opportunities in the Mammoth Hot Springs and the North area.
,_Grand_Prismatic_Spring_--_2022_--_2514.jpg){kind=link}
Booking Mammoth Campground (Yellowstone)
Sites at Mammoth Campground (Yellowstone) are reserved through Recreation.gov. Sites here can be reserved in advance through the official system, and they are claimed fast — cancellations then trickle back all season, unannounced, at any hour of the day or night.
Site facts
| Total sites | 87 |
|---|---|
| Site types | Standard |
| Location | Yellowstone, WY |
| Book through | Recreation.gov |
| Official listing | Recreation.gov |
The cancellation play at Mammoth Campground (Yellowstone)
Because sites are booked months ahead, a steady share of reservations get cancelled as trips fall through. Each cancellation instantly returns that site and those nights to the official calendar — first-come, first-served, no waitlist, no announcement. Refreshing the booking page yourself, every few minutes for weeks, works in theory. In practice, the people who get these sites are the ones who hear about the opening first.
ItOpened scans the Recreation.gov calendar for Mammoth Campground (Yellowstone) around the clock. When a site matching your dates and your vehicle opens, you get a text with a direct link to it. You book it yourself, in your own account, at the normal price. We never book, hold, or resell — your fee pays for monitoring, and openings are first-come, so speed is the whole game.
Other campgrounds in Yellowstone National Park
| Lewis Lake Campground | Cancellation alerts available |
|---|---|
| Indian Creek Campground (WY) | Cancellation alerts available |
| Tower Fall Campground | Cancellation alerts available |
| Slough Creek Campground | Cancellation alerts available |
Page data refreshed 2026-10-29. Site facts come from the official directory listing for Mammoth Campground (Yellowstone); cancellation statistics come from our own scanning logs.