Tent & Tree
Destinations / Stanislaus National Forest
Diamond O Campground
On the Middle Fork Tuolumne near Yosemite's Big Oak Flat entrance — a good fallback when the Valley is full.
Getting a site here
- Forest
- Stanislaus NF
- Reservable sites
- 26
- Getting there
- Hwy 120, then 4 miles up Evergreen Road
From the National Park Service's campground table, checked . Recreation.gov calls it the closest campground to the Big Oak Flat entrance and Hetch Hetchy, near the Middle Fork Tuolumne River.
Popular weekends here book up soon after they open on Recreation.gov. After that, the realistic path is cancellations.
When does your date go on sale at Diamond O? Find the release day →
Cancellations we've caught here
In the last 30 days, 18 booked site-nights at Diamond O came back up (9 of them Friday or Saturday nights). Of the 14 that someone rebooked, at least half were gone within 439 minutes, and 3 within an hour.
Latest:
- Tue Oct 13 · Site 028 River · opened Wed 4:56 PM PT, closed
- Sun Oct 11 · Site 008 Lower · opened Tue 3:50 PM PT, rebooked within 986 min
- Mon Oct 12 · Site 019 River · opened Mon 7:37 AM PT, rebooked within 1792 min
- Fri Oct 9 · Site 006 Lower · opened Sun 11:26 PM PT, rebooked within 439 min
- Sat Oct 10 · Site 006 Lower · opened Sun 11:26 PM PT, rebooked within 439 min
- Sun Oct 11 · Site 006 Lower · opened Sun 11:26 PM PT, rebooked within 439 min
From our own checks of every site here, lately about every 15 minutes for nights this month and next, less often further out. A site that opens and is rebooked between two checks isn't counted, so these are floors, and each time is a bound. Cancellations at every campground we log →
The 7am release here
Arrivals on Saturday, May 1, 2027 went on sale at 7am Pacific on Sunday, November 1. 1 of its 20 sites were already reserved, by stays that started on an earlier night. Of the 19 sites that went on sale, 19 were still open at our 7:17 AM read.
From our own reads just before 7:00 and through the morning; each time is when we looked. Every campground's release →
Diamond O Campground cancellation policy
Cancel by 11:59 p.m. two days before you arrive (Wednesday night for a Friday arrival) and you lose only the $10 fee; after that you also lose the first night. That's Recreation.gov's site-wide rule.
From Diamond O's Recreation.gov page, read Sep 30, 2026. How cancellations work, and how far ahead the cancelled nights are →
Set an alert for your dates and we check every site in Diamond O every 30 seconds. When one opens, you get an email with a direct link to the site and night — you book it yourself, in your own Recreation.gov account.