CampsiteScan

California state park campsites open for booking six months before your arrival date, at 8:00am Pacific, on ReserveCalifornia. It’s a rolling window. Every morning one new date opens. To camp on July 4, 2027, you book at 8am on January 4, 2027. To arrive on Saturday, August 14, you book at 8am on February 14.

That one rule runs every state park and state beach campground in California, 115 parks and 304 campground sections by our count. Here’s how to count back, what really happens at 8am, and which parks are gone before breakfast.

Count back six months, same day of the month

The arrival date and the booking date share a day number. The 20th opens on the 20th. The 3rd opens on the 3rd. Six months is the gap, not 180 days.

Two wrinkles. You book the arrival date and add nights after it in the same booking, so a Friday arrival opens on a Friday six months out and the Saturday night comes with it. [VERIFY: maximum nights per booking and whether every night must fall inside the open window] And month lengths don’t line up. There is no February 31 to open August 31. [VERIFY: how ReserveCalifornia handles arrival dates at the end of longer months]

Set a reminder for 7:50am on the booking day. Log in, have the park and the site picked, and be on the page with your card out. The clock matters to the second.

What really happens at 8am

Two things drop at the same moment. The new date six months out opens. And any site that was sitting in someone’s cart, or under a hold that expired overnight, comes back into the pool. [VERIFY: exact ReserveCalifornia hold and cart timeout rules]

We can see it in our own numbers. Between August 13 and September 10, 2026, we sent 329 alerts for California campsites that had sold out and come back. 156 of them, 47%, fired at 8am Pacific. Almost half of everything we caught landed in that one minute of the day.

The other 173 alerts were true cancellations, spread across the rest of the clock. They peaked in the evenings (5pm was the busiest hour, then 8pm) and on Tuesdays (41) and Wednesdays (40). Friday was the dead day, with 9 cancellations in four weeks.

So 8am isn’t only for people booking six months out. If you want a site for next weekend, 8am tomorrow is the single most likely minute for one to appear. It’s also why you’ll see a lock icon on sites that look empty. Someone is holding them. We explain what the lock icon means separately.

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Weekends are the problem, not the parks

Since our availability record began on August 17, 2026, we’ve checked every ReserveCalifornia park we cover, every day. Across all of them, 83% of Friday and Saturday nights were sold out. Midweek nights: 41%.

That gap is the whole story of state park camping. The campground that’s booked solid every Saturday has room on Tuesday. If your dates can move, move them. If they can’t, you’re competing with everyone else for the 17% of weekend nights that are open, and most of those are inland or off-season.

Our users already know this. Of the 63 scans people have asked us to run, 34 wanted a Friday or Saturday arrival, 52 wanted one or two nights, and 51 were set less than a week before the trip. Most people come to us inside the final week, chasing a weekend.

Which parks fill on release day

The coast fills first. We score each campground on how many nights have nothing bookable, weighted toward weekends, with 100 meaning nothing on any night. For the three weeks from September 10 to 30, 2026, these ReserveCalifornia parks scored 100: Big Basin Redwoods SP (93 sites), Emma Wood SB (79), Westport-Union Landing SB (78), El Capitan SB (22), Mount Tamalpais SP (9), Tolowa Dunes SP, Manresa SB and Andrew Molera SP.

Half Moon Bay SB was at 95, Crystal Cove Moro at 93, and Emerald Bay SP at Tahoe at 89. Of the 36 coastal campgrounds we rate, 10 had nothing on any night and only 4 had room on nearly every night: Hearst San Simeon, Salt Point, Silver Strand and Sue-meg.

For the parks at the top of that list, the 8am release six months out is the booking. If you’re not on the page that morning for a summer Saturday, plan on a cancellation or a different park. The live ranking is on our hardest campgrounds to book page, and every beach we track is on the California beach camping hub.

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Fees and cancellations

ReserveCalifornia charges a reservation fee on every booking and a cancellation fee when you drop one. [VERIFY: current reservation fee and cancellation fee amounts, and the same-day cancellation cutoff] The cancellation fee is the reason sites come back at all. People book on release day, plans change months later, and they let the reservation go rather than pay for a trip they won’t take.

That’s why the timing of cancellations is so lopsided. Three quarters of the sites we catch come back within a week of the arrival date. Nobody cancels a July Saturday in January. They cancel it the Tuesday before.

If you missed 8am

The honest answer is that the site you wanted is now a waiting game. Midweek is bookable right now at most parks. The weekend you wanted depends on someone else’s plans falling through, and that mostly happens in the last week, in the evening, on a Tuesday or Wednesday.

Set a free alert on the park you wanted and we email you the moment a site comes back: campsitescan.com. One campground is free. Pro adds area scans and 5-minute checks.

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Booking site, for reference: reservecalifornia.com.

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