Activities and Programs

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.

    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.

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

Thursday, October 17, 2019

Intermediate Evening Mountain Bike Ride

Mountain Biking

Explore Limestone Canyon by night on this intermediate mountain bike night ride. We will ride out of Augustine, up Loma Ridge, down to The Sinks, and along Limestone Ridge or Limestone Valley, depending on the group. Please plan for a distance between 10-12 miles. Please arrive early as it will get dark quickly. Trails include […]

Intermediate Evening Mountain Bike Ride
Date:
Thu, 10/17/2019
Time:
6:00 PM - 8:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
4
Distance:
13 miles
Minimum Age:
18
Spaces Left:
Full
More Information  

Friday, October 18, 2019

Limestone Canyon Geology Hike to The Sinks

Interpretive

Come along with us to visit one of the most photographed and famous sites on the Irvine Ranch Natural Landmarks – The Sinks. This interpretative program will begin with a hike along a canyon corridor and will visit the east side of The Sinks.  Along the way we’ll talk about the geologic processes that over […]

Limestone Canyon Geology Hike to The Sinks
Date:
Fri, 10/18/2019
Time:
7:30 AM - 1:30 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
4
Distance:
9 miles
Minimum Age:
18
Spaces Left:
9 of 20
More Information  

Saturday, October 19, 2019

Earthcache Hike to East Sinks

Interpretive

Come and hike with us to the East Sinks in Limestone Canyon, location of the Earthcache site — a special place people can visit to learn about unique aspects of the Earth — listed on www.geocaching.com. The cache is titled “The Sinks- Irvine Ranch Wildlands, GC1ZB6V.” This hike is open to existing geocachers, those curious about […]

Earthcache Hike to East Sinks
Date:
Sat, 10/19/2019
Time:
8:00 AM - 12:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
3
Distance:
6 miles
Minimum Age:
16
Spaces Left:
2 of 22
More Information  

Limestone Canyon Photography Truck Tour

Interpretive

Join us on a backcountry wilderness driving tour filled with great sightseeing and photographic opportunities. Our journey begins at the Hicks Haul Staging Area, where you will board the back of an open-air, ten-seat, 4-wheel drive vehicle for a tour of Limestone Canyon.
 We will stop occasionally for 10-15 minutes or so to admire the […]

Limestone Canyon Photography Truck Tour
Date:
Sat, 10/19/2019
Time:
8:00 AM - 2:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
2
Distance:
16 miles
Minimum Age:
18
Spaces Left:
Full
More Information  

Sunday, October 20, 2019

Afternoon Family Beginner Mountain Bike Ride: Limestone Canyon to The Sinks

Mountain Biking

For families and children ages 12 and up who would like to join IRC-certified volunteers 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 […]

Afternoon Family Beginner Mountain Bike Ride: Limestone Canyon to The Sinks
Date:
Sun, 10/20/2019
Time:
3:00 PM - 5:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
Variable
Distance:
8 miles
Minimum Age:
12
Spaces Left:
4 of 20
More Information  

Wednesday, October 30, 2019

Mid-Week Hike: Agua Chinon and The Sinks

Hiking & Fitness

Recharge your batteries with a refreshing mid-week hike through the Agua Chinon Wash in Limestone Canyon Nature Preserve. This hike will visit The Sinks and other possible destinations such as Box Springs, Loma Ridge, Limestone Ridge and Limestone Canyon. This hike involves multiple steep climbs and descents, with 2100+ feet of accumulated climbing elevation, but is […]

Mid-Week Hike: Agua Chinon and The Sinks
Date:
Wed, 10/30/2019
Time:
8:00 AM - 1:00 PM
Where:
Irvine Open Space Preserve
Difficulty Rating:
4
Distance:
12 miles
Minimum Age:
18
Spaces Left:
13 of 20
More Information  

Thursday, October 31, 2019

Thursday Morning Trek: Agua Chinon and The Sinks

Hiking & Fitness

Come out and join us on a breathtaking hike from the Irvine Open Space Preserve into OC Parks’ Limestone Canyon. This week’s docent-led hike begins in the Agua Chinon wash, continues to The Sinks, and may include a side trip to Box Springs, a natural year-round source of fresh water. Maximum distance is just short […]

Thursday Morning Trek: Agua Chinon and The Sinks
Date:
Thu, 10/31/2019
Time:
8:00 AM - 11:00 AM
Where:
Irvine Open Space Preserve
Difficulty Rating:
4
Distance:
7 miles
Minimum Age:
16
Spaces Left:
6 of 20
More Information  

Friday, November 1, 2019

Epic Distance Hike in Limestone Canyon

Hiking & Fitness

Join us on this epic hike through the scenic canyons and along the ridges of Limestone Canyon Nature Preserve. This distance hike involves multiple steep climbs and descents on a variety of trails, both double and single track. Though very challenging, the rewards are well worth the effort – a visit to Dripping Springs, both […]

Epic Distance Hike in Limestone Canyon
Date:
Fri, 11/01/2019
Time:
7:00 AM - 2:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
5
Distance:
16 miles
Minimum Age:
18
Spaces Left:
1 of 15
More Information  

Sunday, November 3, 2019

Intermediate Mountain Bike Ride from Irvine to Limestone Canyon

Mountain Biking

We start our ride on the paved Hicks Haul Road, the extension of Jeffrey Rd north of Portola Pkwy. As we warm up on the climb to the top of the road, we enjoy increasingly beautiful views over Irvine. We then follow Loma Ridge to the East, with fantastic vistas of Orange County, the surrounding […]

Intermediate Mountain Bike Ride from Irvine to Limestone Canyon
Date:
Sun, 11/03/2019
Time:
8:00 AM - 11:30 AM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
4
Distance:
16 miles
Minimum Age:
18
Spaces Left:
10 of 20
More Information  

Saturday, November 9, 2019

Agua Chinon and the Sinks Exploration

Special Events

Please note: Preregistration is required due to limited parking capacity. Start your weekend off by exploring the Agua Chinon wash and the Sinks through this self-guided opportunity. Designated trails will be open for self-guided trail use in OC Parks’ Irvine Ranch Open Space. Trail routes vary in distance and level of difficulty with choices ranging […]

Agua Chinon and the Sinks Exploration
Date:
Sat, 11/09/2019
Time:
8:00 AM - 1:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
Variable
Distance:
Variable
Minimum Age:
n/a
Family Friendly:
Yes
Spaces Left:
Full
More Information  

Sunday, November 10, 2019

Moderate-Paced Ride: Limestone Canyon via Hicks Haul Road

Mountain Biking

This is a moderate-paced ride designed for the intermediate rider who has experience and skills, but sometimes needs to move slower in more technical areas with steep descents/ascents. This program is for very physically fit riders in excellent cardio condition. The ride starts at the Augustine staging area and travels along the Hick’s Haul paved […]

Moderate-Paced Ride: Limestone Canyon via Hicks Haul Road
Date:
Sun, 11/10/2019
Time:
8:00 AM - 10:30 AM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
4
Distance:
11.5 miles
Minimum Age:
16
Spaces Left:
7 of 15
More Information  

Saturday, November 16, 2019

Limestone Canyon Photography Truck Tour

Interpretive

Join us on a backcountry wilderness driving tour filled with great sightseeing and photographic opportunities. Our journey begins at the Hicks Haul Staging Area, where you will board the back of an open-air, ten-seat, 4-wheel drive vehicle for a tour of Limestone Canyon.
 We will stop occasionally for 10-15 minutes or so to admire the […]

Limestone Canyon Photography Truck Tour
Date:
Sat, 11/16/2019
Time:
8:00 AM - 2:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
2
Distance:
16 miles
Minimum Age:
18
Spaces Left:
Full
More Information  

Sunday, November 17, 2019

Afternoon Family Beginner Mountain Bike Ride: Limestone Canyon to The Sinks

Mountain Biking

For families and children ages 12 and up who would like to join IRC-certified volunteers 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 […]

Afternoon Family Beginner Mountain Bike Ride: Limestone Canyon to The Sinks
Date:
Sun, 11/17/2019
Time:
2:00 PM - 4:30 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
Variable
Distance:
8 miles
Minimum Age:
12
Spaces Left:
1 of 20
More Information  

Thursday, November 21, 2019

Intermediate Evening Mountain Bike Ride

Mountain Biking

Explore Limestone Canyon by night on this intermediate mountain bike night ride. We will ride out of Augustine, up Loma Ridge, down to The Sinks, and along Limestone Ridge or Limestone Valley, depending on the group. Please plan for a distance between 10-12 miles. Please arrive early as it will get dark quickly. Trails include […]

Intermediate Evening Mountain Bike Ride
Date:
Thu, 11/21/2019
Time:
5:30 PM - 7:30 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
4
Distance:
13 miles
Minimum Age:
18
Spaces Left:
Full
More Information  

Saturday, November 23, 2019

Slow-Paced Mountain Bike Ride: Two Springs and The Sinks

Mountain Biking

Enjoy the relaxation of riding in the wilderness on empty trails when you join us on this docent led mountain bike ride through Limestone Canyon, one of the most pristine wilderness areas in Orange County. After an ascent of East Loma Ridge, we will visit Dripping Springs. This beautiful, fern covered, year-round source of water for local […]

Slow-Paced Mountain Bike Ride: Two Springs and The Sinks
Date:
Sat, 11/23/2019
Time:
8:00 AM - 10:30 AM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
4
Distance:
13 miles
Minimum Age:
16
Spaces Left:
Full
More Information  

Photo Journey Limestone Canyon: The Sinks, Loma Ridge Backcountry & Sunset

Interpretive

Join us in the back-country wilderness for a journey filled with beautiful sights that are photographic and artistic sketching opportunities. Our journey begins in the afternoon. We will be deep in a secluded canyon, where time is measured in centuries, even millennia, in the sandstone cliffs of this ancient place called Limestone Canyon. You will […]

Photo Journey Limestone Canyon: The Sinks, Loma Ridge Backcountry & Sunset
Date:
Sat, 11/23/2019
Time:
1:00 PM - 5:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
2
Minimum Age:
16
Spaces Left:
Full
More Information  

Tuesday, November 26, 2019

Stewardship Day at the West Sinks View Deck

Stewardship

Please join us as we enhance habitat adjacent to the west viewing deck at the Sinks in Limestone Canyon. This area is characterized by beautiful geological formations that resemble a mini Grand Canyon. Volunteers will travel for approximately 20 minutes in an open air safari style truck to the project site. The morning will be […]

Stewardship Day at the West Sinks View Deck
Date:
Tue, 11/26/2019
Time:
10:00 AM - 1:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
3
Distance:
1 miles
Minimum Age:
14
Spaces Left:
Full
More Information  

Wednesday, November 27, 2019

Mid-Week Hike: Agua Chinon and The Sinks

Hiking & Fitness

Recharge your batteries with a refreshing mid-week hike through the Agua Chinon Wash in Limestone Canyon Nature Preserve. This hike will visit The Sinks and other possible destinations such as Box Springs, Loma Ridge, Limestone Ridge and Limestone Canyon. This hike involves multiple steep climbs and descents, with 2100+ feet of accumulated climbing elevation, but is […]

Mid-Week Hike: Agua Chinon and The Sinks
Date:
Wed, 11/27/2019
Time:
8:00 AM - 1:00 PM
Where:
Irvine Open Space Preserve
Difficulty Rating:
4
Distance:
12 miles
Minimum Age:
18
Spaces Left:
8 of 20
More Information  

Sunday, December 1, 2019

Intermediate Mountain Bike Ride from Irvine to Limestone Canyon

Mountain Biking

We start our ride on the paved Hicks Haul Road, the extension of Jeffrey Rd north of Portola Pkwy. As we warm up on the climb to the top of the road, we enjoy increasingly beautiful views over Irvine. We then follow Loma Ridge to the East, with fantastic vistas of Orange County, the surrounding […]

Intermediate Mountain Bike Ride from Irvine to Limestone Canyon
Date:
Sun, 12/01/2019
Time:
8:00 AM - 11:30 AM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
4
Distance:
16 miles
Minimum Age:
18
Spaces Left:
12 of 20
More Information  

Saturday, December 7, 2019

Wilderness Access Day: Limestone Canyon

Special Events
Limestone canyon trail users

Start your weekend off by exploring numerous opportunities found throughout magnificent Limestone Canyon. Designated trails will be open for self-guided trail use in OC Parks’ Irvine Ranch Open Space. Trail routes vary in distance and level of difficulty with choices ranging from easy one-hour walks to strenuous 15-mile cardio treks. Whether traveling by feet, hooves […]

Wilderness Access Day: Limestone Canyon
Date:
Sat, 12/07/2019
Time:
8:00 AM - 2:00 PM
Where:
Limestone Canyon Nature Preserve
Difficulty Rating:
Variable
Distance:
Variable
Minimum Age:
n/a
Family Friendly:
Yes
Spaces Left:
312 of 450
More Information  
1 2