William R. Mason Regional Park

Use 18712 University Drive, Irvine, CA 92612. Check the official map for the closest parking area to the lake, one of three tot lots, picnic shelter, amphitheater, trails, or natural area.

The park is open daily from 7 a.m.-9 p.m. during spring and summer and 7 a.m.-6 p.m. during fall and winter. Event and office schedules are separate.

Vehicle entry is $3 Monday-Friday and $5 Saturday-Sunday, with higher rates possible on holidays and event days. Park near the exact playground, lake, shelter, or trail you plan to use.

The park has three separate tot-lot playground areas. They are spread across the developed park, so use the official map to choose the most convenient parking and picnic zone.

OC Parks identifies concrete pathways throughout the developed park, supporting walking, jogging, wheelchairs, strollers, and bicycles. The separate 123-acre wilderness area has more natural conditions.

Yes. A large-group shelter can be reserved, and additional family picnic areas, tables, restrooms, lawns, and shade trees are available. Organized uses must follow OC Parks reservation and vendor rules.

Yes, dogs are permitted on leash. Keep them restrained and out of any signed restricted facility, sports, habitat, or event area.

Yes. Restrooms are listed with developed picnic and recreation areas. Use the park map to identify the facility closest to your playground, shelter, lake, or trail route.

The developed park has concrete pathways, accessible parking and curb ramps, and picnic tables with wheelchair overhangs. The separate 123-acre natural area has less predictable terrain, so use the developed lake, playground, and picnic zones when a paved route is important.

No. Swimming and wading are prohibited, and visitors may not launch personal watercraft. The lake is used for viewing and organized model sail boating; follow all posted shoreline barriers and event controls.

Yes. OC Parks describes rows of mature shade trees throughout the developed park, especially around lawns and picnic areas. Playgrounds, trails, and the lake edge can still be exposed, so select a shelter or tree-lined picnic zone when guaranteed shade matters.

No. Mason Regional Park has no listed splash pad, and OC Parks explicitly prohibits swimming or wading in its lake or creek. Watercraft are also prohibited. Treat the 9.2-acre lake as scenery and wildlife habitat, keep children and pets out of the water, and choose a separately operated Orange County aquatic facility for managed swimming or water play.

OC Bus serves the Irvine and UC Irvine area, but OC Parks does not identify one guaranteed park-front route. Use OCTA's current trip planner with 18712 University Drive and verify the stop, final crossing, and return service before leaving; the lake, playgrounds, shelters, amphitheater, and sports fields are spread through the property. Do not rely on an older route number because OCTA schedules change quarterly.

The developed park centers on a 9-acre lake used for scenery and model boats, with nearby picnic areas, playgrounds, paths, and an amphitheater. A separate 123-acre wilderness and natural area occupies another part of the property. Choose the lake, amphitheater, reservable shelter, playground, or wilderness area before parking because this 339-acre park is much larger than a single lawn or lakefront stop.

Vehicle entry is $3 Monday-Friday and $5 Saturday-Sunday, with higher rates on some holidays and event days. General park use is otherwise free; reservations and programs may charge.