Openings · last 7 days
0
01 · Detected Opening History · the openings record · file CS-233772
When Dimond O reopens
Dimond O's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 30 days
10
Openings · last 90 days
121
Weekday pattern
Detected openings by day of week · 90dNo strong weekday pattern is evident in the openings Campsite Sniper has detected: 121 openings spread across the week.
Hour-of-day pattern
First detected by hour · local time · last 90 daysThe largest concentrations of detected openings were first detected during the 18:00 and 23:00 local-time hours. Those hours contained 42 of 121 detected openings (34.7%). Hours show when Campsite Sniper first detected each opening, in Pacific Time, not when the change was made upstream.
Lead-time profile
Days before stay date · percentilesHalf of the openings Campsite Sniper detected appeared at least 10 days before the stay date; the middle 50% land 5–25 days out. Set an alert if you want Campsite Sniper to monitor future openings.
Highest-churn sites
Most openings · 90d| Site | Openings | Share of all openings |
|---|---|---|
| 005 | 11 | 9.1% |
| 028 | 11 | 9.1% |
| 023 | 10 | 8.3% |
| 030 | 10 | 8.3% |
| 019 | 9 | 7.4% |
Site 005 had the most detected openings in the last 90 days: 11. One free watch covers every site here.
02 · Availability Outlook · Apr 26 – May 3, 2027 · of 26 monitored sites
Of the 208 tracked site-nights (Apr 26 – May 3, 2027): 157 open for online reservation · 3 reserved · 48 on sites not offered for online reservation (first-come, first-served or administrative). Of the facility's 26 monitored sites, 20 can be reserved online and 6 are first-come, first-served.
Where the open windows are
24.5% of tracked site-nights are not currently open for online reservation. 157 of 208 remain open; here is where they are.
Load status
Apr 26 – May 3, 2027Not open online24.5%
Open site-nights157 / 208
Reserved (of online inventory)3 / 160
Weekday openings99
Weekend openings58
Of the open site-nights on mapped sites, 99 fall on weekdays and 58 on weekends (Fri–Sun).
Open dates by month
Apr 2027 – May 2027April holds the most room. 98 of 130 site-nights are still open there.
Holiday windows
Sites open per night · of 26 sites| Window | Night | Sites open | Status |
|---|---|---|---|
| Memorial Day | FRI May 28 | 0 | None open |
| SAT May 29 | 0 | None open | |
| SUN May 30 | 0 | None open | |
| MON May 31 | 0 | None open |
Memorial Day: no online availability on any tracked night.
Best-availability sites
Most open site-nights · tracked window| Site | Open site-nights |
|---|---|
| 005 | 8 |
| 006 | 8 |
| 008 | 8 |
| 009 | 8 |
| 013 | 8 |
The 5 sites with the most open site-nights in the current snapshot. Pair a bookable date with a free alert to cover everything else.
Tracked window
CoverageCampsite Sniper's data for this facility starts Apr 26, 2027. That is about 175 days after the current snapshot was taken, so dates before Apr 26, 2027 are not covered by what Campsite Sniper tracks here — they are not known to be unavailable. The site-nights shown on this page describe Apr 26, 2027 onwards only. Check Recreation.gov for earlier dates.
Stays and site detail
157 open site-nights across 20 sites at Dimond O, from the same hourly snapshot as everything above.
Multi-night stays. 21 2-night, 20 3-night, 19 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Apr 26, 2027 at site 005.
RV length. Longest recorded site here is 48 ft. 20 sites take 25 ft, 18 sites take 35 ft, 13 sites take 40 ft. 4 sites of 26 have no recorded maximum and are not counted.
All 20 sites with current availability
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| 005 | Not recorded | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 006 | 22 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 008 | Not recorded | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 009 | 22 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 013 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 014 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 016 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 017 | 44 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 018 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 019 | 36 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 023 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 026 | 48 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 027 | Not recorded | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 028 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 029 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 030 | 40 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 031 | 38 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 032 | 38 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 20/21 | 36 ft | None | 8 | 8 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| 24/25 | 48 ft | None | 5 | 3 nights | Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, May 2, 2027, May 3, 2027 |
About Dimond O
Overview
Dimond O is ideally located closest to Yosemite National Park's Big Oak Flat entrance and Hetch Hetchy. It's nestled near the banks of the scenic Middle Fork Toulumne River, where warm summer days can be spent wading and fly fishing in the refreshing waters.
Recreation
Nearby trails include the Carlon Falls Trail near the Carlon Day Use Area, and Yosemite National Park trails accessible from Hetch Hetchy.
The Middle Fork Toulumne River is a popular spot for swimming, wading and rainbow trout fishing.
Facilities
The campground offers single and double-family sites, many of which are accessible. Picnic tables and campfire rings are provided, as are accessible vault toilets and drinking water. Roads and parking spurs are paved. Firewood is available for a fee.
Natural Features
Some sites overlook the river and others are tucked among cedar and ponderosa pine trees. The Tuolumne River runs for about 150 miles from the central Sierra Nevada to the San Joaquin River.
26 monitored sites6 FCFS sitesRVs up to 48 ftNo hookups24 shadedWaterfrontRiverfrontPets OKFire pitsMax party 12
Getting there
From the Groveland District Office, head east 15 miles on Highway 120, then turn left on Evergreen Road and travel 4 miles. The campground is located on the left.
34660 Evergreen Road, Groveland, CA 95321209-379-2258
BikingBoatingCampingCanoeingClimbingFishingHikingRock Climbing
View on Recreation.gov ↗ Get directions ↗
03 · Field Photos · roll CS-233772 · facility + sites
Photo gallery
Roll CS-233772 · Dimond O · Groveland CA12 frames · facility + sites
FAQ
How do I get a reservation at Dimond O?
Reservations for Dimond O are made through Recreation.gov. The current snapshot shows substantial availability: 157 of 208 tracked site-nights are open (75.5%), though availability can change. Campsite Sniper has also detected 121 site openings here in the last 90 days, so further dates may appear. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
Does Campsite Sniper book this campground for me?
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
How current is this availability data?
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Nov 2, 2026 18:20 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
How often do new openings appear at Dimond O?
Campsite Sniper detected 121 site-date openings here over the last 90 days, none in the last 7. A free alert watches around the clock and pings you the moment one appears.
Can I get a multi-night stay at Dimond O?
20 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Apr 26, 2027 at site 005. Confirm and book on Recreation.gov.
Which sites at Dimond O fit a 35-foot RV?
18 of the 26 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 48 ft. 22 of those 26 sites have a recorded maximum length and 4 do not; they are not counted as fitting.
Which month has the most availability at Dimond O?
April 2027, with 98 open site-nights in the current snapshot of 130.
How far ahead of a stay do openings appear at Dimond O?
Half of the openings Campsite Sniper detected appeared at least 10 days before the stay date; the middle 50% landed 5-25 days out. Campsite Sniper can monitor future changes for dates you select.
When is the next open date at Dimond O?
Campsite Sniper cannot answer that from the current snapshot. The availability data held for Dimond O begins Apr 26, 2027 — about 175 days after this snapshot was taken, so any earlier dates are outside what Campsite Sniper is tracking here rather than known to be unavailable. Check Recreation.gov for dates before Apr 26, 2027.
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When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.
Alerts monitor online-reservable inventory only; first-come, first-served sites are not included.