The best walks and hikes in William R. Mason Regional Park (Wilderness Area)

Yes, dogs are welcome in the park, but they must be on a leash no longer than 6 feet (1.8 meters) at all times. This rule applies to both the paved paths in the main park area and the unpaved trails within the wilderness section.

The wilderness area, located on the east side of Culver Drive, features more rugged terrain compared to the rest of the park. Expect unpaved, dirt trails that wind through scrub-covered ground and along a small creek. The paths are generally considered easy, with some small hills, offering a more natural hiking experience.

Absolutely. The park is very family-friendly. For a very gentle walk, the paved paths on the west side of the park are perfect for strollers and small children. For an easy but more adventurous hike, consider the San Joaquin Marsh Reserve loop, which is mostly flat and offers great opportunities for bird watching.

Yes, William R. Mason Regional Park is a popular spot for trail running. The network of trails offers a good variety, from the flat, paved loops in the main park to the more rugged dirt paths in the 123-acre wilderness area. The varied terrain allows you to customize the difficulty of your run.

The park is a habitat for a variety of wildlife. Around the 9-acre lake, you can often spot migrating birds and turtles. On the trails, especially in the quieter wilderness section, it's common to see rabbits, quail, and even the occasional roadrunner. The adjacent San Joaquin Marsh is a particularly rich area for bird watching.

Yes, there are several excellent loop trails. A great option that is almost entirely flat is the Yale loop — Woodbridge. It's a longer walk that explores the paved paths around the area, making it a reliable choice for a straightforward outing.

There are over 90 designated hiking routes in and around William R. Mason Regional Park. These range from short, paved walks around the lake to more moderate dirt trails that explore the surrounding hills and the adjacent San Joaquin Marsh.

The trails in this area are highly regarded by the komoot community, holding an average rating of 4.8 out of 5 stars. Hikers frequently praise the park's well-maintained paths, the peaceful atmosphere around the lake, and the surprising sense of wilderness so close to the city.

Yes, be aware of planned maintenance. Starting October 15, 2025, and lasting through spring 2026, some trails within the wilderness area will be closed for pedestrian bridge improvements. It's best to check for specific trail alerts with OC Parks before your visit during that period.

For those seeking a longer route, the Mountains to Sea Trail — San Joaquin Marsh Reserve is a great moderate option. This trail covers over 7 miles (12 km) and connects different parts of the local trail system, offering a more extensive exploration of the area.

There are multiple parking lots within William R. Mason Regional Park, accessible from University Drive. Parking is generally plentiful, though it can get busy on weekends. A fee is typically required for vehicle entry into the park. Street parking may be available nearby, but be sure to check local signage.

Yes, the park accommodates both. The western side of the park has wide, paved paths that are ideal for leisurely bike rides and strolls. The eastern wilderness area has unpaved dirt trails that are also open to mountain biking, offering a more rugged experience.