Shoshone National Forest · Wyoming
Overview Threemile Campground is located just three miles from the east entrance of Yellowstone National Park, and 50 miles from the full service gateway community of Cody, in northwestern Wyoming. The area is an ideal destination for a family getaway, with many opportunities for outdoor recreation. Hard-sided camp trailers and RVs are required.
Sites at Threemile Campground 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.
| Total sites | 21 |
|---|---|
| Site types | RV |
| Location | Cody, WY |
| Book through | Recreation.gov |
| Official listing | Recreation.gov |
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 Threemile Campground 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.
| Wapiti Campground | Cancellation alerts available |
|---|---|
| Rex Hale | Cancellation alerts available |
| Big Game Campground | Cancellation alerts available |
| Clearwater Campground | Cancellation alerts available |
| Hunter Peak | Cancellation alerts available |
| Sunlight Rangers Cabin | Cancellation alerts available |
Page data refreshed 2026-10-29. Site facts come from the official directory listing for Threemile Campground; cancellation statistics come from our own scanning logs.