Inyo National Forest · California
Overview Lake Mary is the star of the Mammoth Lakes region. Of the 11 lakes in the area, Mary is the largest and most developed. Lake Mary Campground is a large facility with plenty of amenities in and around it.
Sites at Lake Mary 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 | 48 |
|---|---|
| Site types | Standard |
| Location | Palo Alto, CA |
| 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 Lake Mary 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.
| Oh Ridge | Cancellation alerts available |
|---|---|
| East Fork Campground – Inyo National Forest (CA) | Cancellation alerts available |
| Four Jeffrey | Cancellation alerts available |
| New Shady Rest Campground | Cancellation alerts available |
| Twin Lakes Campground | Cancellation alerts available |
| Sherwin Creek | Cancellation alerts available |
| French Camp | Cancellation alerts available |
| Coldwater Campground - Inyo NF (CA) | Cancellation alerts available |
| Silver Lake Campground June Lake (CA) | Cancellation alerts available |
| Grays Meadows | Cancellation alerts available |
| Convict Lake Campground | Cancellation alerts available |
| Whitney Portal | Cancellation alerts available |
| Old Shady Rest Campground | Cancellation alerts available |
| Tuff Campground | Cancellation alerts available |
| Big Pine Creek Campground | Cancellation alerts available |
| Onion Valley | Cancellation alerts available |
| June Lake | Cancellation alerts available |
| Lone Pine | Cancellation alerts available |
| Mcgee Creek | Cancellation alerts available |
| Forks Campground (Inyo) | Cancellation alerts available |
| Rock Creek Lake (Inyo National Forest, CA) | Cancellation alerts available |
| Bishop Park Campground (CA) | Cancellation alerts available |
| Upper Sage Flat | Cancellation alerts available |
| Pine Glen | Cancellation alerts available |
| Reversed Creek Campground | Cancellation alerts available |
| Agnew Horse Camp | Cancellation alerts available |
| Gull Lake Campground | Cancellation alerts available |
| Agnew Meadows Group Camp | Cancellation alerts available |
| Pumice Flat Group Camp | Cancellation alerts available |
| Cedar Flat Group Campground | Cancellation alerts available |
| Big Pine Canyon | Cancellation alerts available |
| Aspen Group (Inyo) | Cancellation alerts available |
| Bishop Park Group | Cancellation alerts available |
| Obsidian Flat | Cancellation alerts available |
| Palisades Group Campground | Cancellation alerts available |
| Rock Creek Lake Group Camp (Inyo National Forest, CA) | Cancellation alerts available |
| Saddlebag Lake Trailhead Group Camp | Cancellation alerts available |
| Table Mountain (Inyo) | Cancellation alerts available |
Page data refreshed 2026-10-29. Site facts come from the official directory listing for Lake Mary Campground; cancellation statistics come from our own scanning logs.