The best running trails in Sanborn County Park

The John Nicholas Trail offers a diverse jogging experience, transitioning from smooth singletrack through lush canyon woods to more advanced, rocky terrain at higher elevations. You'll pass towering redwood giants and the picturesque Lake Ranch Reservoir, eventually reaching a vista point with expansive views of the South Bay. This difficult 9.4-mile (15.2 km) route involves 1388 feet (423 metres) of elevation gain and takes about 1 hour and 54 minutes, making it a substantial challenge for trail runners.

This popular trail is well-constructed and heavily used by both joggers and mountain bikers. Parking can fill up quickly, so plan to arrive early, especially on busy days. While generally accessible, some initial climbs can be a little rocky and steep, and higher sections feature extremely tight switchbacks. Always carry sufficient water, particularly during warmer periods.

The trail is notable for its purpose-built design, including a 3-mile singletrack section originally for mountain biking, and unique features like well-built footbridges and a hand-constructed stone culvert. It connects to the broader Bay Area Ridge Trail system, offering a glimpse into the region's diverse ecosystems from creek-side forests to high-elevation madrone and spruce groves.

The Saratoga Gap and Ridge Trail Loop offers a dynamic jogging experience through varied terrain, from dense forests of tanoak and Douglas-fir to open chaparral. You'll navigate smooth paths, rocky sections, and even stairs, with the Ridge Trail providing a significant vertical challenge. Keep an eye out for the impressive Castle Rock Falls and enjoy panoramic views that can stretch all the way to Monterey Bay on clear days.

Planning your visit means preparing for a challenging run. Water is available at the Castle Rock Campground and the main park entrance, but not directly on the trail, so bring enough to stay hydrated. The trail is located within Castle Rock State Park, and while a gun range can sometimes be heard, a ridge often dampens the sound.

This difficult 3.8-mile (6.2 km) jogging route, with its 832 feet (253 metres) of elevation gain, is a fantastic option for experienced runners seeking a quick, intense workout in about 52 minutes. It's a great way to experience the diverse landscapes of the Santa Cruz Mountains, combining shaded forest running with exposed ridge sections offering expansive vistas.

The Summit Rock Loop Trail offers a dynamic jogging experience, winding through cool, shaded redwood and tanoak forests before opening up to varied terrain. You'll navigate narrower singletrack paths, old fire roads, and even rock-hop across Bonjetti Creek, making for an engaging run. Keep an eye out for the impressive Indian Rock, a massive sandstone boulder with unique mini-caves.

This moderate 3.3-mile (5.3 km) loop, with its 692 feet (211 metres) of elevation gain, can be completed in about 42 minutes, making it a great option for a challenging but efficient workout. Be aware that the area around Summit Rock may have seasonal closures until late summer to protect nesting peregrine falcons, so check conditions before you go.

Primarily located within Sanborn County Park and bordering Castle Rock State Park, this multi-use trail is popular with joggers, hikers, and horseback riders. Its diverse surfaces and elevation changes require good trail shoes, and the lush forest environment provides a refreshing escape into nature.

The Bay Area Ridge Trail: El Sereno Loop offers a challenging yet incredibly rewarding jogging experience, characterized by its significant elevation changes and stunning panoramic views. You'll navigate wide dirt trails and fire roads, encountering steep, rocky sections that lead to expansive vistas of Lexington Reservoir, Silicon Valley, and the distant Diablo Range. Much of the route traverses exposed chaparral, but higher elevations reveal meadows and occasional shaded groves, providing a dynamic backdrop for your run.

Planning your visit requires a bit of foresight, especially if you're tackling this difficult 7.1-mile (11.4 km) route with its 1306 feet (398 metres) of elevation gain, which typically takes around 1 hour and 33 minutes. Due to the trail's exposed nature, an early morning start is advisable, particularly on hot days, to beat the sun and secure one of the limited parking spots at the Montevina Road trailhead. Remember to bring plenty of water and sun protection.

This segment of the Bay Area Ridge Trail, dedicated in 2021, is celebrated for its solitude and spectacular viewpoints, making it a standout among circular jogging routes in Santa Clara County. While it's a difficult trail best suited for experienced joggers, the payoff is an intimate connection with the South Bay's natural beauty and a chance to spot local wildlife like mule deer and coyotes.