Boulder Basin
San Bernardino National Forest — fishing, hiking
Location: Idyllwild, CA, CA
Price: From $20 per night
Price range: $20–$33 per night
Rating: 4.2 out of 5 (38 reviews)
Season: May through October
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. The San Bernardino National Forest is submitting a proposal to increase fees at various sites across the Forest and is seeking public input.
Cell coverage (FCC estimate): moderate signal. Actual signal may vary in remote areas. Best carrier: T-Mobile. Verizon 4G: 100%. AT&T 4G: 0%. T-Mobile 4G: 100%.
Amenities: Fire Rings, Picnic Tables, Vault Toilets, Fishing
Availability alerts: Set a free cancellation alert at camperwatch.org/campground/boulder-basin to be notified when sites open up.
Boulder Basin Campground offers solitude and primitive camping in the San Bernardino National Forest with 16 sites suitable for tent and self-contained RV camping. Activities include fishing, hiking, biking, horseback riding, and wildlife viewing.
Wildlife alert: Red Diamond Rattlesnake and Southern Pacific Rattlesnake present in area. Also Steller's Jay, Northern Saw-whet Owl, Mountain Chickadee, and San Diego Alligator Lizard.
Insider tips for Boulder Basin: Book early as this is a popular federal campground Black Mountain Road is unpaved with poor conditions; 4WD vehicle with minimum 6 inches ground clearance recommended Suitable for self-contained RVs only as there are no hookups
Skip Boulder Basin if: You need RV hookups. You have a low-clearance vehicle, as Black Mountain Road access requires high ground clearance. You're visiting outside May through October when campground is closed.
Best time to visit Boulder Basin: May-October — Verified operating season from RIDB data.
Nearby campgrounds: Black Mountain (San Bernardino) (Idyllwild, CA), Dark Canyon Campground (Idyllwild, CA), Marion Mountain (Idyllwild, CA), Fern Basin (IDYLLWILD, CA).
Cell Phone Coverage at Boulder Basin
Cell signal at Boulder Basin (Idyllwild, CA): moderate overall signal based on FCC broadband data. Best carrier: T-Mobile.
- Verizon 4G LTE: 100% coverage
- T-Mobile 4G LTE: 100% coverage · T-Mobile 5G: 100%
Coverage data source: FCC Broadband Data Collection (BDC). Actual signal may vary due to terrain, tree cover, and distance from towers. Camper reports are more reliable than coverage maps in remote areas.
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. The San Bernardino National Forest is submitting a proposal to increase fees at various sites across the Forest and is seeking public input.
Verified facts
RIDB / Recreation.gov official databaseAmenities
RIDB /facilities /campsites · owner-verifiedStraight talk
CamperWatch intel · curated from camper reportsKnown issues, each with the workaround. Read before you book.
Insider tips & when to go
CamperWatch intel · hand-curated entryBook early as this is a popular federal campground
Black Mountain Road is unpaved with poor conditions; 4WD vehicle with minimum 6 inches ground clearance recommended
Suitable for self-contained RVs only as there are no hookups
Verified operating season from RIDB data
Things to do nearby
RIDB /activities /recareas + intelConditions today
LiveCell signal
FCC BDC · quarterly datasetFCC maps are theoretical — camper reports confirm signal. Best carrier: T-Mobile.
Wildlife nearby
iNaturalist · research-grade · 8 kmLocation
Leaflet · OpenStreetMap tiles
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.
Campground entrance
Google Maps APICommunity
#community · posts, photos & Q&A · AI-moderated (Claude Vision)Pro tips
- Book on recreation.gov exactly 6 months ahead at 10am ET — San Bernardino National Forest fills fast in peak season.
- Check current road conditions at San Bernardino National Forest before arrival — seasonal closures common.
Frequently asked questions
RIDB facts + intel · FAQPage schema, speakableHow much does Boulder Basin cost per night?+
What season is Boulder Basin open?+
Does Boulder Basin have hookups?+
What is the maximum RV length at Boulder Basin?+
How do I make reservations at Boulder Basin?+
What is the cell service like at Boulder Basin?+
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●Data sources on this page
CamperWatch never fabricates data. Where data is unavailable, it is not shown.
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