State Park / State Forest
Near Los Osos, California: $35/night, rigs to 27 ft. Open Year-round. Book 6 months ahead via ReserveCalifornia.
State Park / State Forest
Managing authority
Near Los Osos, California
How much does camping at Montaña de Oro State Park (Islay Creek) cost, and when is it open?
Montaña de Oro State Park (Islay Creek) near Los Osos, California (State Park / State Forest) — camping fee $35/night, season Year-round, RV size limit Up to 27 ft. Reservations: 6 months ahead via ReserveCalifornia — book direct through the official channel.
The numbers
Fee range
$35/night
Season open
Year-round
RV size limit
Up to 27 ft
Reservation window
6 months ahead via ReserveCalifornia
The insider read
No hookups, no showers — but you wake to seals barking and surf 200 ft from the tent. Sites 1-19 are walk-in (50-200 ft from parking); sites 20-47 are drive-in but smaller. The 'Bluff Trail' starts at the day-use lot a quarter-mile north.
Original analysis from PickRV — synthesised from public sources you can verify, pulling the operational details competitor guides typically skip.
Verify at parks.ca.govOn site
Book it right
PickRV doesn't handle campground bookings — reserve direct through the official channel so policies and cancellations flow through one record.
Opens reservecalifornia.com
Every fact above is sourced from the managing agency's canonical page. Cross-check fee, season, and size limit before you depend on them.
Match the campground's size limit and hookup level to a vehicle category, then plan the rest of the trip.
Keep exploring
Near Borrego Springs
StateInsider tip · Largest state park in California — 600,000 acres. Super-bloom March of wet years draws crowds; check 'desert-usa.com' wildflower report before booking. The full-hookup loop is the only one in the entire park; book that first.
Near Yosemite Valley
NPSInsider tip · 238 sites, the largest Yosemite Valley campground. The window opens at 7:00:00 sharp on the 15th — most July weekends sell out within seconds. The page-refresh trick: open the calendar in 2 tabs, one set to your dates, one set to backup dates.
Near Twentynine Palms
NPSInsider tip · 124 sites scattered between monolithic granite boulders — every site is its own private climbing wall. No water on tap; haul gallons in from Twentynine Palms. Sites 67-78 cluster near 'Skull Rock' trailhead — sunset 30-minute walk-out.
Near Three Rivers
NPSInsider tip · Closest paved camp to General Sherman Tree — 4.5 miles. Bear box at every site; rangers will revoke your reservation if food is left out. Sites 100-150 sit creek-side for white-noise sleep.
Nearby & related
Sourced costs, campground directories, and the places worth a detour — the next layer of California trip planning.
Before you go
California rules
Verified 2026-05-10