2.5 Hours from San Diego, CA
Big Bear & San Jacinto in a Camper Van
Why Big Bear & San Jacinto in a Camper Van?
Big Bear Lake and the San Jacinto Mountains are the closest true mountain escape to San Diego — pine forest, alpine lakes, and 20–30 degrees of relief from the desert heat, all within about two and a half hours. It's the destination that pairs naturally with a desert trip: spend a few nights in Anza-Borrego or Joshua Tree, then climb into the pines to cool off before heading home.
Idyllwild, tucked below Mt. San Jacinto, is a quieter, less-developed alternative to Big Bear — a small mountain town surrounded by national forest, with Tahquitz Rock's granite faces drawing climbers and the Palm Springs Aerial Tramway just over the ridge for a dramatic desert-floor-to-alpine-peak day trip.
Big Bear Lake itself is more developed — boating, a small ski resort in winter, and a lively lakefront village — but the surrounding San Bernardino National Forest has extensive dispersed camping once you're off the main roads around the lake.
Getting There from San Diego, CA
For Big Bear: take I-15 North to CA-18 or CA-38 East up the mountain — approximately 2.5 hours. CA-18 (Rim of the World Highway) is the more direct route; CA-38 via Redlands is longer but less steep and easier for a fully loaded van.
For Idyllwild: take I-15 North to CA-74 East, then CA-243 North up through the San Jacinto Mountains — approximately 2 hours. CA-243 is narrow and winding with sharp switchbacks; both vans handle it fine, but take it slow.
Best Campgrounds & Dispersed Sites
Serrano Campground — Big Bear Lake (USFS)
Reservation required (recreation.gov)
The only campground directly on Big Bear Lake with hookups. Paved sites, easy lake access, and a boat launch nearby. Books out fast on summer weekends — reserve well in advance.
Holcomb Valley — Dispersed (San Bernardino NF)
Free, no reservation
North of Big Bear Lake, an extensive network of dispersed forest camping in a historic gold-mining valley. High clearance helps on some spur roads but isn't strictly required for the main routes. Quiet, forested, and free.
Fern Basin & Marion Mountain — San Jacinto Mountains (USFS)
First-come-first-served, no reservation
Small, primitive campgrounds near Idyllwild at the base of Mt. San Jacinto, close to the Deer Springs and Marion Mountain trailheads. No water at either — bring what you need.
Idyllwild County Park
Reservation recommended
A developed campground right in Idyllwild, walking distance to town. Good base if you want restaurants and a brewery within reach after a day in the forest.
Best Time of Year
Summer (Jun–Aug)
Peak season for both areas — cool mountain air is a welcome break from desert heat elsewhere on your trip. Campgrounds book out on weekends.
Fall (Sep–Nov)
Excellent — smaller crowds, cooler days, and fall color in the aspens around Big Bear. Our favorite window for this destination.
Winter (Dec–Mar)
Snow is common above 6,000 ft. Big Bear Mountain Resort runs a small ski operation. Tire chains may be required on CA-18 and CA-243 during storms — check Caltrans before heading up.
Spring (Apr–May)
Snowmelt can leave trails muddy at higher elevations, but lower trails and the towns themselves are pleasant and uncrowded.
Van-Specific Tips
- ◆ Winter storms can require chains on CA-18, CA-38, and CA-243. Check Caltrans QuickMap before heading up between December and March.
- ◆ The diesel heater in both vans handles cold mountain nights easily, even with snow on the ground.
- ◆ Fuel up before climbing — gas is more expensive in Big Bear and Idyllwild than at lower elevations.
- ◆ Dispersed camping in the San Bernardino National Forest requires a California Campfire Permit for any stove or fire use — free online, worth getting before you go.
- ◆ This is a great "cool-down" stop to pair with a desert-heavy itinerary — three nights in Joshua Tree, then two nights up here, works well.
- ◆ Cell service is generally decent around both towns but drops off quickly on forest roads.
Ready for the mountains?
Rent a van for this trip.
The easiest way to cool off between desert legs of a bigger trip — or a destination on its own. Both vans handle the mountain roads with ease. Book through Outdoorsy.
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