Openings · last 7 days
2
Booking reality
Campsite Sniper detected 2 site openings here in the last 7 days
01 · Detected Opening History · the openings record · file CS-232022
When Boulder Basin reopens
Boulder Basin's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 30 days
4
Openings · last 90 days
9
Only 9 openings in the last 90 days: not enough recent activity for a reliable pattern. A free Campsite Sniper alert watches around the clock instead, and pings you the moment one opens.
02 · Availability Outlook · Sep 18 – Oct 25, 2026 · of 16 monitored sites
Of the 608 tracked site-nights (Sep 18 – Oct 25, 2026): 447 open for online reservation · 117 reserved · 44 on sites not offered for online reservation (first-come, first-served or administrative).
Where the open windows are
26.5% of tracked site-nights are not currently open for online reservation. 447 of 608 remain open; here is where they are.
Load status
Sep 18 – Oct 25, 2026Not open online26.5%
Open site-nights447 / 608
Reserved (of online inventory)117 / 564
Weekday openings302
Weekend openings145
Of the open site-nights on mapped sites, 302 fall on weekdays and 145 on weekends (Fri–Sun).
Open dates by month
Sep 2026 – Oct 2026October holds the most room. 325 of 400 site-nights are still open there.
Holiday windows
Sites open per night · of 16 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 |
|---|---|
| 009 | 34 |
| 008 | 32 |
| 013 | 31 |
| 017 | 31 |
| 026 | 31 |
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 · Sep 25
The next bookable night is Sep 22; the first open weekend starts Sep 25. Campsite Sniper can watch later dates for you.
Stays and site detail
447 open site-nights across 16 sites at Boulder Basin, from the same hourly snapshot as everything above.
Multi-night stays. 55 2-night, 55 3-night, 19 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Sep 22 at site 009.
All 16 sites with current availability
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| 009 | 20 ft | None | 34 | 34 nights | Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3 +22 more |
| 008 | Not recorded | None | 32 | 29 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +20 more |
| 013 | 20 ft | None | 31 | 20 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +19 more |
| 017 | Not recorded | None | 31 | 20 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +19 more |
| 026 | Not recorded | None | 31 | 17 nights | Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3 +19 more |
| 032 | Not recorded | None | 30 | 22 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +18 more |
| 005 | 20 ft | None | 29 | 13 nights | Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5 +17 more |
| 003 | Not recorded | None | 27 | 17 nights | Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3 +15 more |
| 015 | 20 ft | None | 27 | 12 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +15 more |
| 025 | Not recorded | None | 27 | 17 nights | Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3 +15 more |
| 027 | 20 ft | None | 27 | 8 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 4, Oct 5, Oct 6 +15 more |
| 029 | 20 ft | None | 27 | 14 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +15 more |
| 022 | 20 ft | None | 25 | 12 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +13 more |
| 028 | Not recorded | None | 25 | 8 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +13 more |
| 023 | Not recorded | None | 23 | 5 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +11 more |
| 030 | Not recorded | None | 21 | 5 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +9 more |
About Boulder Basin
Overview
Black Mountain Road is is poor condition at this time. A four-wheel drive (4WD) vehicle is recommended with a minimum ground clearance of 6 inches. Drive at your own risk.
The San Bernardino National Forest is submitting a proposal to increase fees at various sites across the Forest and is seeking public input. Please visit the https://www.fs.usda.gov/sbnf for more information and to submit comments regarding this proposal.
Boulder Basin Campground offers solitude and primitive camping in a scenic mountain landscape. The area provides ample recreational opportunities, including hiking, mountain biking, boulder climbing and more. Black Mountain Road, which accesses Boulder Basin Campground, is a narrow rough dirt road which may not be suitable for all vehicles.
Recreation
The campground provides access to a number of trailheads, including the Black Mountain Trail, a 3.6-mile, moderately strenuous hiking, mountain biking and horseback riding trail that travels through the forested slopes of Black Mountain.
The trail provides excellent views of the Banning Pass and Mt. San Gorgonio. The trail provides access to the famed Pacific Crest National Scenic Trail, which begins at the Mexico border in Southern California and leads to Washington border of Canada.
Facilities
The campground offers multiple single-family campsites, available for tent and small RV / van camping. Each site is equipped with tables and campfire rings with grills. Vault toilets are also provided.
Natural Features
The campground is located in a mixed conifer forest, which provides ample shade throughout the day. It is situated at an elevation of about 7,300 feet. Roads to the campground are not paved but the campground does have paved roads.
Nearby Attractions
This group site is located approximately 50 miles southeast of San Bernardino, California, and 14 miles north of Idyllwild, where fuel and a variety of small town shops and restaurants are available.
16 monitored sitesRVs up to 20 ftNo hookupsPets OKMax party 8
Getting there
From Idyllwild, travel north for about 8 miles on State Route 243. Turn right onto Black Mountain Road/Forest Route 4S01 and continue about 5 miles to the campground. Black Mountain Road is an unpaved forest road, not recommended for low clearance vehicles or trailers.
Po Box 518, Idyllwild, CA 92549909-382-2922
BackpackingBikingCampingFishingHikingHorseback RidingMountain BikingPicnickingWildlife Viewing
View on Recreation.gov ↗ Get directions ↗
03 · Field Photos · roll CS-232022 · facility + sites
Photo gallery
Roll CS-232022 · Boulder Basin · Idyllwild CA12 frames · facility + sites
FAQ
How do I get a reservation at Boulder Basin?
Reservations for Boulder Basin are made through Recreation.gov. The current snapshot shows substantial availability: 447 of 608 tracked site-nights are open (73.5%), though availability can change. Campsite Sniper has also detected 9 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 13:18 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 Boulder Basin?
Campsite Sniper detected 2 site-date openings at Boulder Basin in the last 7 days, 4 over 30 days and 9 over the last 90.
Can I get a multi-night stay at Boulder Basin?
55 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 Boulder Basin fit a 35-foot RV?
No RV-analyzable site here has a recorded maximum of 35 ft or more; the longest recorded is 20 ft. 7 of those 16 sites have a recorded maximum length and 9 do not; they are not counted as fitting.
Which month has the most availability at Boulder Basin?
October 2026, with 325 open site-nights in the current snapshot of 400.
When is the next open date at Boulder Basin?
As of the Sep 18, 2026 snapshot: the next open date is Tue, Sep 22 and the next open weekend starts Fri, Sep 25. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
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