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Hall Canyon on Horseback

Take a leisurely ride on beautiful Hall Canyon and...

Limestone Canyon - Weekend Hike to Both Sides of the Sinks

Join us on this moderate-paced hike over the ridge...

Mountain Bike Ride at Fremont and Weir Canyons to Sierra Peak

Join us in OC Parks’ Irvine Ranch Open Space for a...

Growing Together at the Native Seed Farm

Looking for a way to give back to Nature this...

Agua Chinon and the Sinks Exploration Day

Please note: Preregistration is required due to...

Mountain Bike Ride at Fremont to Lizard Rock

Join us in OC Parks’ Irvine Ranch Open Space for a...

Nature's Grocery Store

Come enjoy and learn about the bounty of the local...

History

Ralph B. Clark Regional Park has a rich history of fossils. Over 10,000 years ago this site contained marshes, grassy meadows and oak woodlands, inhabited by at least 70 forms of life including the ancient mammoth, ground sloth and ring-tailed cat. Paleontologists have discovered remains of prehistoric camel, whale, bison...

Hoofprints and Horizons: a Gentle Family Hike with a Horse

Escape into the stunning landscapes of the Irvine...

Restoration Day

Lend a helping hand to improve native habitat at...