Outdoor Activities and Programs - Irvine Ranch Natural Landmarks

The activities below are offered by a variety of organizations and their dedicated volunteers. All programs are FREE unless noted below. Programs led by IRC-Certified Volunteers require pre-registration, which closes at 4 p.m. on the day prior to the event. No walk-up registrations will be permitted for these events. For policies of other organizations, please use the sign-up information provided. For mobility device policies click here.

Irvine Ranch Conservancy is committed to providing a safe and respectful environment for all participants, volunteers, and employees. Certain offensive behaviors, including problematic language or attacks based on race, color, religion, national origin, sex, sexual orientation, gender identity or expression, age, disability, or veteran status will not be tolerated. Participating in certain offensive behaviors may lead to dismissal from activities.

Note: Minors must be accompanied by a parent or guardian for these events. For programs requiring online registration, each adult and child must be registered.

Need help? For the fastest answers, look for organization-specific contact information in each event listing (click More Information for full listing). If no contact information is listed, email info@irconservancy.org for assistance.

Updated Difficulty Ratings: The Hiking and Fitness Difficulty Ratings have been updated to reflect our current activities. Please click below to read the ratings.

Click here to learn more about IRC-Certified Volunteers. • Click here to learn more about the Difficulty Ratings.

Search & Filter Activities

List Grouped Lists Grid Calendar

Saturday, May 31, 2025

Advanced Cardio Hike: Red Rock Wilderness

Join us for a strenuous, extremely challenging, fast-paced, early morning cardio hike in Red Rock Wilderness part of OC Parks’ Irvine Ranch Open Space. Along the way we’ll be rewarded with panoramic views and possible wildlife sightings. This is an 9-mile cardio hike, completed in 2.5+ hours, includes a 1000+ foot elevation change. This hike is for experienced, physically fit hikers who enjoy the challenge of multiple steep climbs and descents. This hike is much faster than a regular walking hike. We average four (4) miles per hour, fast-paced and is extremely difficult over steep terrain in the wilderness setting.