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Explore OC Parks’ Irvine Ranch Open Space

Enjoy self-guided access to protected open space, or choose from docent-led hikes and kid-friendly nature activities.

In 2010, OC Parks accepted a gift or 20,000 acres of open space from the Irvine Company. These special, protected wildlands, known as the Irvine Ranch Open Space, are operated by OC Parks, with public programs and activities available through the Irvine Ranch Conservancy.

A variety of docent-led activities, including hiking, biking and habitat restoration are available throughout the week. Self-guided access is available during monthly Wilderness Access Days. These popular events have gained a reputation as “DIY” open space experiences. However, for those not ready to go it alone, Wilderness Access Days include docent-led hikes and kids’ activities as well.

These events switch each month between Limestone Canyon and Black Star Canyon. These unique outdoor adventures begin with check-in at the staging area, where friendly volunteers from Irvine Ranch Conservancy are on hand to help guide visitors to the right trails for their interest, experience and time available. Volunteers are also stationed out on the trails, to provide assistance along the way.

Wilderness Access Days and docent-led hikes are free. And while registration for the access day is strongly encouraged, registration for docent-led hikes is required. Participants can register online at -- registration for Saturday Wilderness Access Days and Saturday’s hikes ends on the preceding Friday at 4 p.m.

To see upcoming events and activities click on the links below.