Saturday, Nov 26, 2022

SISU 24 Hour Ultra

1100 N. Canyon Blvd

Monrovia, CA 100 Miler, 24 Hours - Team, 24hrs

This Event Took Place Sat. Nov 26, 2022

Event Postponed

This event has been postponed from Nov 25, 2023 to Jul 06, 2024

About the Race

We are excited to announce our return home, Camp Trask in Monrovia, CA!

SISU ENDURANCE presents one of the most unique events on the planet. You have 24-Hour to explore and run any distance you like, with the opportunity to achieve one of the toughest 100-Mile races anywhere! We start in Monrovia Canyon Park-Camp Trask. You are encouraged to come Friday and set up your base camp. Set up your tent and gear next to the Boy Scout Fort - which provides a unique and fun experience, please bring the entire family, crew, or friends – all extra support team are free and encouraged! Saturday morning the race starts. 100-mile runners go out first, then Individual and team 24-hour runners follow shortly after(100 milers start at 5am, 24-hour racers start at 7am) The race ends Sunday, 24 hours later for team and individual, and 36-hour cutoff for 100-mile athletes(4pm).

This race is self-supported. We encourage everyone to be festive and creative with your camp. We will have movies as well as arts and crafts for the family! There are multiple loops all leaving from base camp. Every time you head out you check in at the head table which is at the fort at Trask. You choose which loops you want to do, and how many miles you desire! There are also challenges through the 24 hours if you desire such as midnight yoga, and community service. At the end points are earned by your miles as well any extra challenges you do. You are never far from base camp and your gear/fuel/food. There will be hot food for sale at base camp! The mood is festive with lights, movies, crafts, and onesies. You may encounter bears, cats, deer, and other wildlife but they are your SISU neighborhood friendly wildlife friends, so bring your camera!

New for 2024

We have decided to bring in a new format to the 24 this year. We have added 2 new races. These are two different races that you can take on individually or combined as part of the SISU challenge.

Monrovia Night Dash 30K
Take on 1 lap of the brand new MTD Route at night, the race starts at 9pm
MT. Bliss 21k
Take on 1 lap of the Mt Bliss Trail. The race starts on Sunday at 7am
SISU Challenge
Complete the Monrovia night dash 30k and the Mt Bliss 21k within the time frame given for each race. If you do so you might be able to call yourself SISU strong. Purchase the SISU Challenge option to get both races at a discount.

Southern California Ultra Runner's Grand Prix Series

SISU ENDURANCE is proud to announce the SISU 24 is a qualifying race as part of the Southern California Ultra Runner's Grand Prix Series!

Participating Races: Orange Curtain 50k/100k, Sycamore Canyon 50-100K, Griffith Park Trail, Old West Trails 50k, Run4Kids 12H/24H/100M, Santa Barara Nine Trails, Old Goat 50, Oriflamme 50, SISU 24, Leona Divide, PCT 50, Born To Run, Nanny Goat, Holcomb Valley, Black Mountain, Harding Hustle, AC100, Kodiak 100, Bulldog Ultra, Noble Canyon, Rocky Peak, Lake Hodges

Visit --> Series Registration

Trail & Camp

We are trail runners and love this community. SISU is very proud to offer this race at an affordable price point. Included in your registration is 3 days of camping! The Camp has suffered a lot of damage from fires and floods so this year Cabin stays are not an option. Please bring your tent, sleeping bag, etc. There is a main area where you will have access to set up your camp site. Remember this is just to sleep, we expect you out and racing all weekend! Additionally, the Fort at Camp Trask has recently been remolded and this is where our base camp will be held. Athletes are invited to come and set up tents in and around the camp. All profits will be donated directly to the restoration of the camp, so please be understanding of the years of tribulation.
Please bring your family and crew and camp for free on us! Set up a tent, use your car, just be mindful of the bears and keep your things locked up. Fires are not permitted.
This event will take place at Camp Trask, a special place located in Monrovia, CA. Camp Trask is located

Refund Policy

  1. Please read the entire information provided in the catalog. Make sure you know what you are signing up for.
  2. We do realize that things can come up and keep you from making the race:
    • A 60% refund will be allowed within in the first 45 days of your payment.
    • Post 45 days we will allow you to transfer to the next year for a fee of 50% of your registration.
  3. We DO NOT allow substitutions or transfers. The registration is only good for the person that registered. Teams may switch team members for a fee of $10. However we do not allow substitutions or transfers of solo registrations.
  4. If the race is postponed for any reason out of the race directors control all registrations will be forwarded to the following year. There are NO REFUNDS due to a cancellation or postponement
  5. Finally if you do not show up and fail to arrange for a deferment that is a DNS. This will be a total forfeit of you entry fees.
  6. There are no exceptions to these rules.
*If the event is postponed due to event venue or other circumstance out of the race's control all registrations will be forwarded to the following year. If that date does not work, they will be forwarded to the year after that. If neither of those options work for you, you may gift your entry to any athlete of your choice. Simply contact the Maria de Heras at There will be no refunds in this case as things happen outside of the event's control*

Event's current local time: 12:01 PM PT


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