Porcupine Trail loop from Woodacre

The Porcupine Trail loop from Woodacre is a standout mountain biking route in Marin County, offering a dynamic ride that packs a punch. This moderate 4.8-mile (7.7 km) loop features 802 feet (245 metres) of climbing, and you can expect to complete it in about 52 minutes. It's an excellent choice for riders looking for varied terrain and a taste of technical singletrack without committing to an all-day epic.

What to expect on Porcupine Trail loop from Woodacre

Expect a journey through diverse landscapes, from dense wooded areas providing welcome shade to open grasslands offering expansive views of the Loma Alta Open Space Preserve. The trail begins with forested climbs, transitioning into technically rooted sections, especially in the upper parts, which demand careful line choices. As you descend, the lower trail becomes fast and flowy, even featuring some jumps for an exhilarating finish. This route is best suited for mountain bikers with good fitness and advanced riding skills, as some sections, particularly 'Upper Porcupine,' can be quite challenging.

Planning your visit

The Porcupine Trail is a key part of the Loma Alta Open Space Preserve, and notably, one of the few bike-legal singletracks in Marin County. While specific parking details aren't provided, Woodacre serves as the natural starting point. The trail is part of the broader Bay Area Ridge Trail, making it a popular connector. Given its varied terrain, the best season for riding would likely be spring or fall when conditions are generally drier and temperatures are mild.

Trail details

• Distance: 4.8 miles (7.7 km)
• Elevation gain: 802 feet (245 metres)
• Difficulty: moderate
• Estimated time: 52 minutes