Thompson Creek Trail Hiking Guide
Thompson Creek Trail winds through a quiet canyon on the edge of Claremont, offering one of the San Gabriel foothills' most rewarding moderate hikes without the crowds of more famous routes. Shaded stretches of coast live oak and sycamore line the creek corridor, making this trail a genuine escape even on warm afternoons. The route climbs steadily toward the San Gabriel Mountains, rewarding hikers with wide views of the Pomona Valley and beyond.
Trail Overview and Route Description.
Thompson Creek Trail runs along the namesake creek drainage from a trailhead near the base of the San Gabriel foothills in Claremont. The out-and-back route travels approximately 7 miles round trip with roughly 1,400 feet of elevation gain. The lower section follows the creekbed closely, crossing the seasonal stream several times before the path climbs into more open chaparral on the upper slopes. Footing is generally good on packed dirt, though creek crossings can be slippery after winter rains. The trail is well-marked and intuitive, making navigation straightforward for hikers of most experience levels.
Scenery and Natural Highlights
The lower canyon is the trail's scenic centerpiece. Dense groves of coast live oak and California sycamore create a canopy that filters sunlight into soft pools, and the creek sustains a lush understory of ferns and wildflowers in late winter and early spring. Hikers frequently spot mule deer, red-tailed hawks, and the occasional coyote along the brushy upper sections. On clear days, especially after winter storms scrub the air clean, the upper trail opens onto sweeping views stretching south across the Pomona Valley and east toward the San Bernardino Mountains. The contrast between the intimate lower canyon and the open ridgeline makes the climb feel genuinely earned.
Best Seasons and Conditions
Fall through spring is the ideal window for Thompson Creek Trail. Mild temperatures between roughly 50°F and 70°F make the climb comfortable, and winter rains bring the creek to life, filling pools and deepening the canyon's green canopy. Wildflower season typically peaks from late February through April, adding splashes of color to the oak woodland floor. Summer hiking is possible but not recommended — south-facing chaparral slopes trap heat, afternoon temperatures frequently exceed 90°F, and the creek runs dry. If you hike in summer, start no later than 7 a.m. and carry significantly more water than you think you need.
Trailhead Access and Parking
The trailhead is accessed from the north end of Claremont, just below the foothills. Street parking is available near the trailhead along the surrounding residential streets; arrive early on weekends to secure a spot close to the start. There is no day-use fee for this trail. The nearest services — gas, food, and restrooms — are a short drive south into downtown Claremont, which has a walkable village with cafes and shops worth visiting post-hike. Cell service is generally reliable at the trailhead but can be spotty in the deeper sections of the lower canyon.
Dogs on Thompson Creek Trail
Thompson Creek Trail is dog-friendly, and well-behaved dogs on leash are welcome on the route. The creek crossings and shaded lower canyon make this one of the more comfortable foothill trails for dogs during the cooler months. Bring enough water for your pet — the creek is seasonal and should not be relied upon as a drinking source. Watch for poison oak along the creek banks, which can transfer from brush to a dog's coat and then to you. Picking ticks off both yourself and your dog after the hike is standard practice on any chaparral trail in the San Gabriel foothills.
Safety and Trail Etiquette
Thompson Creek Trail sees a mix of hikers and mountain bikers, so stay alert on blind corners and yield appropriately. The creek crossings add a genuine hazard after heavy rain — if water is moving fast or looks more than knee deep, turn back rather than risk a fall on slick rocks. Rattlesnakes are present in the chaparral, particularly in warmer months; watch where you step and place your hands. Cell coverage gaps in the lower canyon mean that hiking with a partner or group is a smart practice. Let someone know your intended turnaround point before heading out, and carry a basic first-aid kit on longer outings.
Hiking tips for Thompson Creek Trail
- Start before 8 a.m. on weekends to claim roadside parking near the trailhead and avoid afternoon heat on the exposed upper slopes.
- Carry at least two liters of water per person — the creek is seasonal and unreliable as a source, especially from late spring onward.
- Wear waterproof or quick-dry footwear from November through April when creek crossings are likely to be wet.
- Check for poison oak along the creek banks; it grows densely in the lower canyon and is present year-round, even when leafless in winter.
- Bring trekking poles for the steeper upper section, where loose decomposed granite can make descents slippery, particularly when dry.
Nearby trails to explore
- Marshall Canyon Trail
- Sunset Peak Trail
- San Antonio Falls Trail
Hike this trail with TrailMates
TrailMates makes it easy to find other Claremont-area hikers who know Thompson Creek Trail and want to explore it together. Use the mate finder to match by pace and skill level, or post a group hike and let your next trail partner find you — download TrailMates and get moving.