O’Neill Regional Park is located beneath coast live oak and sycamore trees at the corner of Trabuco and Live Oak Canyons. The park is popular for both day use and overnight camping. Despite its proximity to the urban sprawl of Orange County, California, the park’s hillsides are filled with cactus, sagebrush, and chaparral, creating an environment that makes visitors feel miles away from civilization. Managed by OC Parks, it’s open year-round and ideal for outdoor enthusiasts, blending rugged trails with family-friendly amenities.
O’Neill Regional Park Day Use Activities
O’Neill Park offers a variety of seasonal activities, but its main attractions are the picnic and campground facilities, along with 18 miles of riding and hiking trails. The picnic areas accommodate individuals and groups, featuring tables, barbecues, a large grassy area, horseshoe pits, and playground equipment.
The park has trails designated for mountain biking, horseback riding, and hiking, with the Mesa Trail and Live Oak Trail being dog-friendly. Visitors can also explore the O’Neill Park Nature Center, which is open every weekend and on weekdays by request. The park operates daily from 7 a.m. until sunset. Trails may be closed after rain, and camping is available year-round.
Camping at O’Neill Regional Park
O’Neill is a popular spot for car camping in Orange County, with 79 individual sites, 8 group sites (17+ people), and five equestrian sites. All have picnic tables, fire rings, and access to restrooms/showers (coin-operated). No hookups except optional electrical/water at select sites.
Best Campsites: Campsites at O’Neill Park are spacious compared to most campgrounds. Campsites 1 through 29, back onto Trabuco Canyon Road, are the least desirable. Campsites 31 to 78 are adjacent to seasonal Trabuco Creek and offer the best wilderness experience, with showers, bathrooms, and potable water close to all sites. Dogs are permitted on a leash in the camping area.
Day Use & Camping Fees
Day Use: Monday–Friday parking is $3; Weekends $5.00. Entrance is per vehicle; no additional fee for pedestrians or cyclists. Day Use Hours: 7 a.m. to sunset daily.
Camping: Campsites are $20 per night, $15 (senior 60+/disabled). Max RV length 35 ft; reservations are recommended 3–4 weeks in advance. Additional fees: $6 for utility hookups, $5 for a second vehicle, $6 for non-camper dump station use, $ 5 per bundle for firewood. Quiet hours 10 p.m.–6 a.m.; fires only in rings. Camping: Year-round; check-in at 2 p.m., check-out at 12 p.m.
O’Neill Regional Park History
O’Neill Park, like many parks in Orange County, is rich in history. This area of California was first discovered in 1769 by Gaspar de Portolá, who led an expedition through the foothills of Santiago Peak, which later became known as Orange County.
Lost Trabuco: On the second day of exploring the area, Portola turned inland to avoid the swamps and streams that now make up the city of Irvine. While the group was camping, one of the soldiers lost his musket, which was also called a “Trabuco.” As a result of this incident, the entire area became known as Trabuco Canyon.
Regional Park: O’Neill Regional Park originated in the late 1930s, when land along Trabuco Canyon was acquired for public use. The park was officially established in 1948, following the O’Neill family’s donation of additional land. Over the years, the park has expanded to its current size of 4,500 acres.
Getting to O’Neill Regional Park
The park is located just north of Rancho Santa Margarita in Trabuco Canyon, 11 miles east of the San Diego Freeway via El Toro (Santiago Canyon Road) and Live Oak Canyon Roads. To reserve a campsite or for more information, visit the park website.
Nearby Points of Interest
Cook’s Corner Bar and Restaurant. The intersection of Santiago Canyon Road and Live Oak Canyon Road is a popular destination, particularly on weekends, when hundreds of bikers gather to enjoy juicy burgers and cold drinks. A strict “no club colors” policy is enforced, making Cooks a family-friendly establishment (during the day). Despite encroaching suburbia, Cook’s Corner endures as Orange County’s “last roadhouse,” a testament to its canyon heritage.
Irvine Regional Park, Orange County’s oldest regional park, is about 15 miles north of O’Neill Regional Park via Santiago Canyon Road—making it an easy add-on for canyon explorers, blending urban accessibility with serene escapes amid sycamores, willows, and seasonal wildflowers. Managed by OC Parks, it’s a haven for picnickers, hikers, and wildlife enthusiasts, featuring over 16 miles of trails, a small zoo, a historic railroad, and seasonal events that draw over 1 million visitors annually.