Big Burro 24 Hour

24 Hours. 5-Mile Loop. Sunset to Sunset.

The Big Burro 24 Hour is an old-school mountain ultra on the Maple Hills Trail System in Big Bear, California.

Runners will complete as many laps as possible on an approximately 5-mile loop over 24 hours. The format is simple: start at sunset, run through the night, see what you have left when the sun comes back up, and keep moving until sunset Saturday.

This is not a polished road race. It is a gritty, community-driven trail event built around good people, hard miles, a lively basecamp, and the kind of suffering that makes ultras worth doing.

Event Details

Date: April 30 – May 1, 2027
Location: Maple Hills Trail System, Big Bear, CA
Start Time: Sunset Friday, approximately 7:00 PM
Finish Time: Sunset Saturday, approximately 7:00 PM
Format: Timed trail race
Course: Approx. 5-mile loop
Winner: Most completed laps in 24 hours

Course

The course uses existing trails within the Maple Hills Trail System.

Expect a mix of runnable singletrack, punchy climbs, rocky sections, fast descents, and classic Big Bear mountain terrain.

Each lap returns runners to the Start/Finish basecamp before heading back out.

Aid

Aid will be available at:

Start/Finish Basecamp
Primary aid, timing, crew access, medical, and race operations.

Shore Drive Aid Station
On-course aid station.

Elementary Trailhead Aid Station
On-course aid station.

Runners may crew from the Start/Finish area only.

Schedule
Friday, April 30

4:00 PM – Check-in opens
6:30 PM – Runner briefing
Sunset / approx. 7:00 PM – Race start

Saturday, May 1

Sunset / approx. 7:00 PM – Race finish
After race – Awards and cleanup

Trail Stewardship

The Big Burro 24 Hour is committed to supporting the Maple Hills trails.

We will coordinate a volunteer trail work day before race weekend, remove all course markings after the event, and donate $5 from every race entry to the Bear Valley Education Foundation for trail maintenance and improvements.

Warning

Sleep deprivation, mountain weather, bad decisions, and repeated 5-mile loops may become habit-forming.

Register accordingly.

Challenges & Awards

The Big Burro 24 Hour offers multiple ways to test yourself. Whether you're chasing the overall win, 100 miles, or simply your longest day on the trails, every lap counts.

?? Big Burro Champion

The overall winner is the runner who completes the greatest number of full laps within the 24-hour time limit.

Awards will be presented to the top overall male and female finishers.

The Burro Hundred

20 Laps. 100 Miles.

Complete twenty full laps (100 miles) within the 24-hour time limit and earn induction into The Burro Hundred.

Burro Hundred finishers receive:

Official Big Burro Hundred Belt Buckle
Recognition on the Burro Hundred Finisher List
Lifetime membership in the Burro Hundred Club

The belt buckle is reserved exclusively for runners who complete the full 100-mile challenge.

Course Records

The inaugural running of the Big Burro 24 Hour will establish two permanent course records.

Overall Course Record

The greatest number of laps completed within 24 hours.

Burro Hundred Course Record

The fastest time to complete 20 laps (100 miles).

Both records will be recognized each year and serve as benchmarks for future competitors.

Event's current local time: 8:41 AM PT