Enjoy self-guided access in the southern portion of Irvine’s Open Space Preserve. The entire southern Open Space Preserve trail network will be open for self-guided hiking and biking from 8 am to 2 pm. This includes the single-tracks in Shady Canyon and Bommer Canyon that are reserved for guided activities only. Registration is not required for this event, though it is shown on the website. If you need driving directions, please use the online registration to receive a map and instructions for getting to Bommer. The Bommer Canyon Cattle Camp will be available for parking, but please take note that your vehicle must be removed from the Cattle Camp area by 2 pm.

Explore beautiful Limestone Canyon, part of OCParks’ Irvine Ranch Open Space, on this serene morning hike to Dripping Springs. Limestone Canyon Nature Preserve is one of the most pristine wilderness areas in the county. Dripping Springs is an extremely sensitive area and an essential watering hole for wildlife. We’ll hike through coastal sage scrub, grasslands, and oak woodlands as we take in this iconic destination. This 7-mile hike moves between 3 and 3.5 mph with a total elevation gain of 1300 feet. Please come prepared with a sturdy day pack, water, snacks, closed-toe hiking shoes or boots, sunscreen, first aid, and all other supplies to keep you safe and healthy on the trail.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-4 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Come explore the Peter and Mary Muth Interpretive Center and gather with family and friends for a festive morning painting holiday ornaments and learning about our local estuary.

All materials will be provided.

All are welcome; however, the program is designed for ages 6 and up. Minors under age 16 must be accompanied by a parent or guardian at all times.

We will meet in the Learning Center that is located within the Peter and Mary Muth Interpretive Center. Both the program and parking are free.

For questions, please contact resource specialist Emma Arago at emma.arago@ocparks.com or call (949) 923-2277.

Limestone Canyon is a treasure waiting to be discovered. Join us for an afternoon, moderately-paced, 5.5-mile beginning cardio hike. The hike may include a few short rest stops along the way and will be a great introduction to fitness, cardio-style hikes as well as OCParks’ magnificent Irvine Ranch Open Space.  Views of Limestone Canyon, and the surrounding wilderness, from Limestone Ridge will be the highlight of our tour.

Please bring a minimum of 48 oz. water. Come prepared with a pack, sturdy closed-toed hiking shoes or boots, sunscreen, first aid, and all other supplies to keep you safe and healthy on the trail for this beginner cardio-paced (3-3.5 mph with very few stops) hike in a wilderness area. Each participant must carry his or her own pack and water.  Under-prepared participants may be denied access to this program.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level 3 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

You will enjoy a gorgeous sunset with panoramic views of Orange County while hiking in OCParks’ Irvine Ranch Open Space on the paved Hicks Haul Road. This hike travels 6 miles, out and back crossing over Loma Ridge. This is the perfect activity for you to get your work-out in and view the sunset. The hike is conducted at an average pace of 3-3.5 miles per hour, but you may travel a bit faster or slower, at a walk, run, or jog depending on your comfort level. Because of the paved surface of the road, you may wear regular running or walking shoes. Trail shoes are fine, but not required. Please bring adequate water!

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level 4 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Come enjoy an early morning hike in Fremont Canyon Nature Preserve, part of OC Parks’ Irvine Ranch Open Space. Our hike climbs steeply from the mouth of Fremont Canyon, past an abandoned coal mine up to the Fremont Weather Station where winds have been clocked at up to 100 mph. After enjoying the view, we’ll hike back the same way to our starting point. This hike involves steep hills and a 1200’ elevation change but the rewards are panoramic views of Orange County, the Santa Ana Mountains and surrounding areas as well as possible wildlife sightings. Please arrive 15 minutes early and come prepared with a sturdy day pack, water, snacks, closed-toe hiking shoes or boots, sunscreen, first aid, and all other supplies to keep you safe and healthy on the trail.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-4 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Join us on this fast-paced hike over the ridge and the through beautiful Limestone Canyon Nature Preserve, part of OCParks’ Irvine Ranch Open Space. While this will not be a cardio hike, it will be a steady pace of 3 mph with short breaks at the East and West Sinks viewing platforms. We will enjoy a view of wonderful vista’s in addition to spectacular view of The Sinks. This hike involves hiking on both double and single-track trails with an elevation gain of 1000.

Please come prepared with a sturdy day pack, water, snacks, closed-toe hiking shoes or boots, sunscreen, first aid, and all other supplies to keep you safe and healthy on the trail on this half-day hike in the wilderness area.
Under-prepared hikers may be denied access to the event. Please come prepared.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-4 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Join us Sunday morning in OCParks’ Irvine Ranch Open Space for a fitness-focused hike on the Hicks Haul Road, West Loma and Shoestring trails in Limestone Canyon. Hikers will enjoy wonderful views and a panoramic overview of Orange County. The hike starts at Hicks Haul Road staging area and will cover a distance of 8.5 miles, about 5 miles of the hike is on paved surface and rest on trails. Participants are expected to hike close to 3 miles per hour and come prepared with closed toe hiking boots or shoes, water, trail snacks, sunscreen, hat, day pack or fanny pack, and any other necessary equipment or supplies you might need to keep you safe on this hike.

Experience the serenity of Bommer Canyon during this moderate-paced hike in the Irvine Open Space Preserve. We’ll experience mature coastal sage scrub and fantastic views overlooking the city of Irvine and the hillsides to the north. This hike is just over 3 miles and includes 700 feet of total climbing elevation with several very steep inclines. The steepest section ascends 300 feet in a quarter-mile. Participants must be in good physical condition.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-3 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Trail Patrol for future IRC-led activities

Permission received from OC Parks 12/6/23

Route: Gypsum, Trail 5, Trail 1, Trail 2, Trail 3, Trail 4, Trail 5, Trail 1, Oven

If you are new to mountain biking and interested in getting started the right way, or if you just want to hone your existing skills developing terrain-influenced bike handling over several types of man-made features, this is the clinic for you! The class begins with a brief overview of rider fundamentals starting with platform position and weight transfer then covering equipment basics & setup, braking, gearing and a brief bike maintenance Q&A session followed by a series of exercises demonstrating terrain-influenced bike handling over a variety of man-made features including log piles, rock step-ups, A-frames and many more. These riding techniques will be taught and practiced at the Mountain Bike Skills Development area. This activity originates in the City of Irvine and travels into OC Parks’ Irvine Ranch Open Space.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-3 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Come chat with a Civil War living historian at the cannon in Irvine Regional Park! The volunteer will share the history of the 1853 Howitzer cannon and how it came to be at its current location. Hear recounts of other historical elements found in and around Irvine Regional Park’s long history as well as the Civil War.

The volunteer may take periodic breaks. Check with the Nature Center on future Civil War reenactor visits! Inclement weather may cancel.

You can find the Civil War living historian located at the cannon and Spanish-American War Veterans monument at the lake, near the snack stand and boat house, between Parking Lots U and T.

For further questions, please contact Resource Specialist Kelley Brugmann at Kelley.Brugmann@ocparks.com and 714-973-6625

For families and children ages 12 and up who would like to join IRC-certified volunteers in OCParks’ Irvine Ranch Open Space on a longer, slow-paced, family-oriented ride through sycamores, oaks, and habitat native to California. The route takes us to The Sinks, Orange County’s own “Grand Canyon.” Along the way, we will stop and talk about the local habitat, and hope to see some of our local native animals and raptors. The ride is an 8-9 miles with 400-800 feet of elevation gain that may require hike-a‐bike for some riders.

Motorized recreation vehicles of any class or type are not permitted for recreational use. Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level 2-3 activity on the land.  Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Come enjoy a scenic evening cardio hike in the remote Fremont Canyon Nature Preserve, part of OCParks’ Irvine Ranch Open Space. Our hike climbs steeply from the mouth of Fremont Canyon along the Lakeview Trail overlooking Irvine Lake. Upon reaching our turnaround point, we’ll head back the same way, descending to our starting point. This challenging hike involves steep climbs and an 1100’ elevation gain but the rewards are sweeping views of Fremont at sunset. Please arrive 15 minutes early and come prepared with a sturdy pack, water, closed-toe hiking shoes or boots, sunscreen, first aid, and all other supplies to keep you safe and healthy on the trail.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-4 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Enjoy nature with friends and family in Round Canyon. We hike along a fairly flat trail as we watch for red-tailed hawks and mule deer. This activity originates in the City of Irvine and travels into OC Parks’ Irvine Ranch Open Space. The hike averages 2-3 miles round trip at an easy pace with a medium level of interpretation. This program is for participants who would like a slower-paced and level hike. Wear comfortable clothes and sturdy shoes, and bring water for the hike.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-2 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Come explore the newly opened Gypsum Canyon Wilderness, the northernmost portion of OC Park’s Irvine Ranch Open Space. This scenic fitness hike involves steep climbs and descents on several single-track trails and is done at an average moving pace of 3 miles per hour. Reward yourself with panoramic views of Fremont and Weir Canyon Nature Preserves and beyond, possible wildlife sightings, interesting rock formations and beautiful wildflowers in season.

Please come prepared with a sturdy day pack, water, snacks, closed-toe hiking shoes or boots, sunscreen, first aid and all other supplies to keep you safe and healthy on the trail. All participants must carry their own day pack and water and be comfortable hiking an average moving pace of 3 miles per hour. Underprepared participants may be denied access to this activity.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-4 activity on the land.

It’s easy to think many of the birds we see and hear look and act the same. But do they? Bring your binoculars and join us on a slow/medium paced walk in OCParks’ Irvine Ranch Open Space, as we search for resident and visiting birds of the local coastal sage scrub, oak woodland, riparian, and grassland habitats. We will discuss the diverse features of the birds we observe and how they match the season, their habitat and lifestyle. We will travel mostly on ranch roads, usually without shade. Beginners to advanced bird enthusiasts are welcome. Please wear sturdy shoes suitable for hiking and bring water, along with sun protection such as a hat and sunscreen. Bring a small birding field guide if you have one. A few binoculars will be available to borrow.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-2 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Join us every Monday night for a fitness-focused hike on the paved Hicks Haul Road in the Irvine Open Space Preserve. During the spring, summer and fall, hikers will enjoy wonderful sunset views and a panoramic overview of Orange County. This hike travels about 3.5 miles, up to the top of Loma Ridge and back down. The hike is conducted at about 3-3.5 miles per hour, but you may travel a bit faster or slower, at a walk, run, or jog depending on your comfort level. Most participants finish the route in about 1 hour. Because of the paved surface of the road, you may wear regular running or walking shoes. Trail shoes are fine, but not required. Please bring adequate water!

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-3 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Join us on this early morning hike in OC Parks’ Whiting Ranch Wilderness Park. This hike involves steep climbs and descents on a variety of trails, both double and singletrack, and is done at an average moving pace of 3 mph. Though challenging, we are rewarded with canopied woodlands, sweeping views, and possible wildlife sightings. Please come prepared with a daypack, 70 oz. (2 quarts) of water, trail snacks, closed-toe hiking shoes, sunscreen, first aid, and any other supplies needed to keep you safe on the trail. Each participant must carry his or her own pack and water. Under-prepared participants may be denied access to this program.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-4 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.

Ready for a workout? Forget the gym for the day and head outside! Join us for an exhilarating morning fitness hike on the paved Hicks Haul Road in OCParks’ Irvine Ranch Open Space. This hike allows you to choose between a 3, 6, or 8 mile route, all of which are conducted at the speed of about 3.0 to 3.5 miles per hour. The footing on the asphalt paved road is smoother than dirt roads and single track trails normally found in Limestone Canyon Nature Preserve, but is beginning to show its age with cracks, crevices and an occasional dip. Otherwise, the terrain is smooth, so this is a great walk for anyone who wants a “wilderness experience” without getting dirty! The 6 and 8 mile routes experience two fairly steep ascents and descents. The 3 mile route takes you to the top of Loma Ridge and back down. Along the way, you will have sweeping views of much of Orange County and the Santa Ana Mountains. Various animals, like hawks, deer, and lizards are also frequently seen in this area.

Reviewing the 1-through-5 Difficulty Ratings will help you evaluate your readiness to participate in this level-3/4 activity on the land. Please visit our FAQ page for answers to activity specific questions you may have prior to registering.