OutdoorSoCal
Pinyon Mountain Trail is an 8.8-mile expert-rated 4WD route across Anza-Borrego Desert State Park in San Diego County, California. The route crosses the Pinyon Mountains east of Borrego Springs, dropping down Fish Creek Wash to Split Mountain Road for a total run of roughly 25 miles. California State Parks manages the corridor; only street-legal 4WDs are permitted, since the park bans OHV use (those riders go to Ocotillo Wells SVRA next door).
Three named obstacles define the difficulty: The Squeeze, the Rock Garden, and Heart Attack Hill. All three demand lockers, 33-inch tires, high ground clearance, and full recovery gear. Most groups run the route one-way from the S-2 trailhead, exiting via Fish Creek Wash. The reliable season is October through April; summer heat plus no cell service makes rescue scenarios harder.
Trailhead: 33.05692, -116.42146
- Technical Difficulty
- hard
- Length
- 25 miles
- Direction
- Point to point
- Vehicle
- 4WD with at least one locking differential; 33-inch tires minimum; high ground clearance. Full recovery gear and a spare tire required. Only street-legal vehicles permitted; Anza-Borrego prohibits OHV use.
- Nearest town
- Borrego Springs, California
- Terrain
- Designated jeep trail through the Pinyon Mountains. Two-track climb to a technical mid-route section, then a sandy descent through Fish Creek Wash to Split Mountain Road.
- Cell coverage
- None on the route or the descent wash.
- Best months
- Oct, Nov, Dec, Jan, Feb, Mar, Apr
- Management
- California State Parks
- Trailhead
- 33.05692, -116.42146
Resources
Maps
Directions
From San Diego. Take I-8 east, then County Road S-2 north (Imperial Highway). Drive about 30 miles north on S-2. The Pinyon Mountain Trail trailhead is signed on the east side of S-2 just south of Shelter Valley.
From Borrego Springs (north access). Take Borrego Springs Road south to S-2. Continue south on S-2 about 12 miles to the trailhead.
Exit (Fish Creek Wash to Split Mountain Road). The eastern terminus drops into Fish Creek Wash. Follow the wash 15 miles east to Split Mountain Road, which connects to Highway 78 and Ocotillo Wells.
Photos · 3
Getting Oriented
Pinyon Mountain Trail sits in the central Anza-Borrego Desert in San Diego County. Anza-Borrego Desert State Park is California's largest state park at 600,000 acres and contains roughly 500 miles of designated dirt roads; Pinyon Mountain is one of the most technical of them. The trail runs east-west across the Pinyon Mountain range between County Road S-2 to the west and the Fish Creek Wash drainage to the east.
Additional photos and a first-hand trail report at our sister site OutdoorSoCal.
Trail Overview
Eight and a half miles of designated route to the eastern terminus, plus a 15-mile sandy exit through Fish Creek Wash to Split Mountain Road. Most of the first six miles run as relatively benign two-track climbing through pinyon-juniper terrain. The technical work clusters between mile 6.9 and mile 7.9. After Heart Attack Hill, the route descends into the Pinyon Wash drainage and joins Fish Creek Wash for the sand exit. Plan four to six hours from S-2 to Split Mountain depending on group size and how clean the obstacles run.
The Three Obstacles
- The Squeeze (mile 6.9). A tight off-camber passage between two rock walls. Body damage risk for full-size trucks. Spot the line before committing.
- The Rock Garden (mile 7.3). A sequence of stepped boulders that includes the Rear Window Breaker — exactly what it sounds like. Spotter mandatory.
- Heart Attack Hill / Pinyon Mountain Drop-off (mile 7.9). A steep descent down loose rock into the Pinyon Wash drainage. The crux of the route. Lockers and proper tires don't make this easy; they make it possible.
Vehicle and Gear Requirements
- 4WD with at least one locking differential. Front and rear lockers preferred.
- Minimum 33-inch tires.
- High ground clearance. Stock vehicles get hung up routinely.
- Full recovery gear: traction boards, kinetic rope, winch, hi-lift or bottle jack.
- Spare tire and a tire repair kit. Sharp rock punctures are common.
- Comms beyond cell phones (CB, GMRS, or satellite messenger). No cell service on the route.
Where to Camp
Dispersed camping is allowed on designated roadways within Anza-Borrego SP, with vehicles required to stay within one car length of the road. The Sandstone Canyon area along Fish Creek Wash is a popular shaded lunch or overnight stop. Borrego Springs has commercial campgrounds and lodging for staging. Ocotillo Wells SVRA next door has more developed RV-style sites if Borrego fills up.
Tips for a Safe and Enjoyable Trip
- Run with at least one other vehicle. Self-recovery on Heart Attack Hill is not a realistic plan.
- Confirm trail status with the Anza-Borrego Visitor Center (760-767-4205) before driving. The park closes corridors after rain to protect the road bed.
- Air down before entering Fish Creek Wash. Fifteen miles of deep sand will bury a rig at street pressure.
- Carry more water than you think. Desert temperatures swing 50°F between night and day in winter.
- Bring a Garmin inReach or PLB. Cell coverage is gone from the moment you leave S-2.
- For OHV recreation, head to Ocotillo Wells SVRA next door. Anza-Borrego itself bans OHV use and only permits street-legal vehicles.
Hazards
- Three named obstacles. The Squeeze, Rock Garden, Heart Attack Hill — all expert-rated. Body damage and rollovers are real risks.
- No cell coverage. Self-recovery isn't optional. Bring a satellite messenger.
- Sand exit. Fish Creek Wash is deep sand for 15 miles; air down before entering or you'll bury the rig.
- Heat. Anza-Borrego summer temperatures regularly top 110°F. The reliable window is October through April.
- Resource damage closures. Anza-Borrego closes corridors after wet weather to protect the road bed. Confirm before driving.
- No OHVs. Only street-legal 4WDs are permitted on the trail.