Openings · last 7 days
31
Booking reality
Campsite Sniper detected 31 site openings here in the last 7 days
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
80
Openings · last 90 days
89
Weekday pattern
Detected openings by day of week · 90dFriday accounted for the largest share of the openings Campsite Sniper detected. 25 of 89 openings detected in the last 90 days occurred on a Friday (28.1%), with Thursday (20) and Tuesday (16) next in line.
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 33 of 89 detected openings (37.1%). 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 24 days before the stay date; the middle 50% land 12–32 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 |
|---|---|---|
| 030 | 11 | 12.4% |
| 005 | 9 | 10.1% |
| 023 | 7 | 7.9% |
| 24/25 | 7 | 7.9% |
| 032 | 6 | 6.7% |
Site 030 had the most detected openings in the last 90 days: 11. One free watch covers every site here.
02 · Availability Outlook · Sep 18 – Oct 13, 2026 · of 26 monitored sites
Of the 676 tracked site-nights (Sep 18 – Oct 13, 2026): 107 open for online reservation · 400 reserved · 169 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
84.2% of tracked site-nights are not currently open for online reservation. 107 of 676 remain open; here is where they are.
Load status
Sep 18 – Oct 13, 2026Not open online84.2%
Open site-nights107 / 676
Reserved (of online inventory)400 / 507
Weekday openings100
Weekend openings7
Of the open site-nights on mapped sites, 100 fall on weekdays and 7 on weekends (Fri–Sun).
Open dates by month
Sep 2026 – Oct 2026October holds the most room. 63 of 338 site-nights are still open there.
Holiday windows
Sites open per night · of 26 sites| Window | Night | Sites open | Status |
|---|---|---|---|
| Labor Day | SAT Sep 5 | 0 | None open |
| SUN Sep 6 | 0 | None open | |
| MON Sep 7 | 0 | None open |
Labor Day: no online availability on any tracked night.
Best-availability sites
Most open site-nights · tracked window| Site | Open site-nights |
|---|---|
| 005 | 10 |
| 009 | 10 |
| 24/25 | 10 |
| 008 | 9 |
| 030 | 9 |
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.
Next windows
As of Sep 18, 2026 snapshotNext open dateTue · Sep 22
Next open weekendFri · Oct 9
The next bookable night is Sep 22; the first open weekend starts Oct 9. Campsite Sniper can watch later dates for you.
Stays and site detail
107 open site-nights across 20 sites at Dimond O, from the same hourly snapshot as everything above.
Multi-night stays. 33 2-night, 8 3-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Sep 22 at site 009.
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 | 10 | 5 nights | Sep 22, Sep 23, Sep 30, Oct 4, Oct 5, Oct 6, Oct 7, Oct 8, Oct 12, Oct 13 |
| 009 | 22 ft | None | 10 | 5 nights | Sep 22, Sep 23, Sep 24, Sep 29, Sep 30, Oct 9, Oct 10, Oct 11, Oct 12, Oct 13 |
| 24/25 | 48 ft | None | 10 | 3 nights | Sep 22, Sep 23, Sep 24, Sep 30, Oct 1, Oct 4, Oct 5, Oct 8, Oct 12, Oct 13 |
| 008 | Not recorded | None | 9 | 4 nights | Sep 28, Sep 29, Sep 30, Oct 5, Oct 6, Oct 7, Oct 8, Oct 12, Oct 13 |
| 030 | 40 ft | None | 9 | 3 nights | Sep 22, Sep 23, Sep 24, Sep 29, Sep 30, Oct 4, Oct 7, Oct 8, Oct 13 |
| 017 | 44 ft | None | 7 | 2 nights | Sep 24, Sep 30, Oct 1, Oct 5, Oct 7, Oct 12, Oct 13 |
| 032 | 38 ft | None | 7 | 3 nights | Sep 23, Sep 24, Sep 29, Sep 30, Oct 1, Oct 12, Oct 13 |
| 026 | 48 ft | None | 6 | 2 nights | Sep 24, Sep 29, Sep 30, Oct 8, Oct 12, Oct 13 |
| 016 | 40 ft | None | 5 | 2 nights | Sep 23, Sep 30, Oct 1, Oct 4, Oct 5 |
| 20/21 | 36 ft | None | 5 | 2 nights | Sep 22, Sep 23, Oct 1, Oct 5, Oct 6 |
| 018 | 40 ft | None | 4 | 2 nights | Sep 30, Oct 8, Oct 12, Oct 13 |
| 029 | 40 ft | None | 4 | 1 night | Sep 23, Oct 1, Oct 5, Oct 13 |
| 031 | 38 ft | None | 4 | 2 nights | Sep 24, Oct 5, Oct 12, Oct 13 |
| 013 | 40 ft | None | 3 | 2 nights | Sep 23, Oct 12, Oct 13 |
| 023 | 40 ft | None | 3 | 1 night | Sep 29, Oct 7, Oct 13 |
| 027 | Not recorded | None | 3 | 2 nights | Oct 7, Oct 8, Oct 13 |
| 028 | 40 ft | None | 3 | 2 nights | Sep 24, Oct 12, Oct 13 |
| 014 | 40 ft | None | 2 | 2 nights | Sep 29, Sep 30 |
| 019 | 36 ft | None | 2 | 1 night | Sep 24, Sep 30 |
| 006 | 22 ft | None | 1 | 1 night | Sep 30 |
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. 84.2% of tracked site-nights are not currently open for online reservation; 107 of 676 remain open. Campsite Sniper has also detected 89 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 Sep 18, 2026 16:19 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 31 site-date openings at Dimond O in the last 7 days, 80 over 30 days and 89 over the last 90.
Which day of the week had the most detected openings at Dimond O?
Friday accounted for the largest share of the openings Campsite Sniper detected in the last 90 days: 25 of 89 (28.1%). Days reflect when Campsite Sniper first detected each opening, not when the change occurred upstream.
Can I get a multi-night stay at Dimond O?
8 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Sep 22 at site 009. 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?
October 2026, with 63 open site-nights in the current snapshot of 338.
How far ahead of a stay do openings appear at Dimond O?
Half of the openings Campsite Sniper detected appeared at least 24 days before the stay date; the middle 50% landed 12-32 days out. Campsite Sniper can monitor future changes for dates you select.
When is the next open date at Dimond O?
As of the Sep 18, 2026 snapshot: the next open date is Tue, Sep 22 and the next open weekend starts Fri, Oct 9. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
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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.