San Ysidro

San Ysidro is a hard hike in California, about 9 miles long and roughly 3,000 feet of elevation gain from its low point of about 450 feet to the top at about 3,468 feet. It is an out-and-back route, and the trailhead sits just under a mile from the town of Montecito. The trail is open year-round and is a natural-surface route that allows horses and bikes, according to the USDA Forest Service's trail records. That makes it a flexible option for riders on foot, horseback or on two wheels. The climb is steep, and the route is rated hard. The Old Pueblo Trail and the Wiman Trail both start within a third of a mile of the trailhead. Climbers can head to Romero Canyon Bouldering, about 2 miles away, or Lower Cold Springs Canyon, a similar distance.