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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. No walk-up registrations will be permitted. Minors must be accompanied by a parent or guardian for all events. For policies of other organizations, please see the sign-up information provided.
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Our Activities and Programs

The activities listed are offered by a variety of organizations and their dedicated volunteers. All programs are FREE unless noted otherwise. Programs led by IRC-Certified Volunteers require pre-registration. No walk-up registrations will be permitted. Minors must be accompanied by a parent or guardian for all events. For policies of other organizations, please see the sign-up information provided.
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31 Events Found • Filtered by: Area: Fremont Canyon Nature Preserve

Sunday, November 16, 2025

Experienced mountain bikers can explore one of the most rugged and remote areas of OC Parks’ Irvine Ranch Open Space from the trails of Fremont Canyon Nature Preserve on this moderate-paced ride through Fremont, Blind, and Weir Canyons. Fremont Canyon...

Date:
Sun, 11/16/2025
Time:
8:00 am - 11:00 am
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
4
Distance:
15 miles
Minimum Age:
16
Registration:
Registration Opens on 11/02/2025 at 8:00am

Tuesday, November 25, 2025

Join us for an amazing distance hike from remote Fremont Canyon to the oak woodlands of Weir Canyon. Shortly after leaving Irvine Regional Park, this hike climbs steeply from the mouth of Fremont Canyon and passes an abandoned coal mine....

Date:
Tue, 11/25/2025
Time:
7:00 am - 1:00 pm
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
5
Distance:
14 miles
Minimum Age:
18
Registration:
Registration Opens on 11/10/2025 at 8:00am

Friday, November 28, 2025

Watering native plant nursery at Fremont Staging Area by IRC Volunteers.

**No need to water during rainy days.

Date:
Fri, 11/28/2025
Time:
9:00 am - 10:00 am
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
1
Minimum Age:
12

Saturday, November 29, 2025

**Due to trail closures, this hike is being rerouted. It will not be the full 16 mile loop but an out and back to “Mini Moab”. The hike will be shortened to 14 miles with 2900 feet of elevation gain.**...

Date:
Sat, 11/29/2025
Time:
7:00 am - 1:00 pm
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
5
Distance:
16 miles
Minimum Age:
18
Registration:
Registration Opens on 11/14/2025 at 8:00am

Sunday, November 30, 2025

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...

Date:
Sun, 11/30/2025
Time:
7:00 am - 9:30 am
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
4
Distance:
6 miles
Minimum Age:
18
Registration:
Registration Opens on 11/15/2025 at 8:00am

Tuesday, December 2, 2025

Non-native and invasive plant species are invading our native habitat and open spaces. They aggressively compete with our native plants for resources and spreads rapidly once established. Monitoring, management, and removal of these plant species is an important aspect of...

Date:
Tue, 12/02/2025
Time:
8:30 am - 11:30 am
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
3
Distance:
0 miles
Minimum Age:
18
Registration:
Registration Opens on 11/17/2025 at 8:00am

Sunday, December 7, 2025

The Irvine Ranch Open Space Ultra Distance, series is designed for experienced hikers who thrive on long days, big climbs, and the satisfaction of pushing physical and mental limits. This hike covers approximately 18 miles with 3,400 feet of elevation...

Date:
Sun, 12/07/2025
Time:
8:00 am - 3:00 pm
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
5
Minimum Age:
18
Registration:
Registration Opens on 11/21/2025 at 8:00am

Saturday, December 13, 2025

Join us for an extremely challenging and strenuous hiking adventure in the scenic Fremont Canyon Wilderness Area. This 16-mile loop hike is for experienced, physically fit distance hikers. The hike is on fire/SCE dirt roads with numerous significantly steep, unrelenting...

Date:
Sat, 12/13/2025
Time:
7:00 am - 1:00 pm
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
5
Distance:
16 miles
Minimum Age:
18
Registration:
Registration Opens on 11/28/2025 at 8:00am

Join us in OC Parks’ Irvine Ranch Open Space for a challenging docent-led mountain bike ride for very experienced off-road riders in excellent cardio shape. Climb challenging State Spur to Cathedral Rock, and then descend into Fremont Canyon while passing...

Date:
Sat, 12/13/2025
Time:
7:30 am - 12:30 pm
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
5
Distance:
25 miles
Minimum Age:
18
Registration:
Registration Opens on 11/28/2025 at 8:00am

Thursday, December 18, 2025

Come bring your horse and join us on the sage-scented trail up and down gentle hills. We will start from Irvine Park and proceed on the Irvine Regional Park Horseshoe Loop to Waterworks trail that will take us under the...

Date:
Thu, 12/18/2025
Time:
10:00 am - 2:00 pm
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
3
Distance:
6 miles
Minimum Age:
18
Registration:
Registration Opens on 12/03/2025 at 8:00am

Sunday, December 21, 2025

Experienced mountain bikers can explore one of the most rugged and remote areas of OC Parks’ Irvine Ranch Open Space from the trails of Fremont Canyon Nature Preserve on this moderate-paced ride through Fremont, Blind, and Weir Canyons. Fremont Canyon...

Date:
Sun, 12/21/2025
Time:
8:00 am - 11:00 am
Where:
Fremont Canyon Nature Preserve
Difficulty Rating:
4
Distance:
15 miles
Minimum Age:
16
Registration:
Registration Opens on 12/07/2025 at 8:00am
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