MIAMI, FLORIDA / THE FIRST EDITION
CAME TO FIND OUT.
One 4.167-mile loop. A new start every hour.
Keep returning until one runner remains.
THE FIRST BELL
8:00 AM EST
Miami Marine Stadium / Virginia Key, Miami
Registration on RunSignup
No previous ultra finish required. Learn how the hourly format works.
01 / THE FORMAT
One loop.
One shared hour.
Run or walk the loop in less than an hour. The time you have left is yours to rest and reset. Then everyone starts together again.
- 01
Complete one loop.
Complete 4 miles and 880 feet in less than one hour.
- 02
Rest and reset.
Use the time left in the hour to eat, drink and recover.
- 03
Start together again.
Be fully inside the starting corral for the next on-the-hour bell.
Finish in 48 minutes. Reset for 12.
There is no preset finish time or distance.
Your first Backyard Ultra?
Previous Backyard experience or an ultramarathon finish is not required. Learn the rules and prepare for repeated hourly starts. First-timer questions
02 / THE PLACE
Return to
the Basin.
Miami Marine Stadium.
Virginia Key, Miami.
The planned course combines dirt trail with paved or concrete sections. The same course is planned throughout the race, including after dark.
The final measured course map will be shared before race day.
COURSE + RACE DETAILS03 / COME PREPARED
Before the
first bell.
Bring your preparation. The Athlete Guide will contain final arrival, check-in and site procedures before race weekend.
ALL RACE QUESTIONSArrival and parking
Packet pickup, parking and arrival details are being finalized. The Athlete Guide and final race-week update will contain the complete instructions.
RACE WEEKEND FAQCrew and race aid
Crew support is between yards. There is no personal aid or pacing during a yard. Crew and spectators are welcome in designated areas; keep the active course, corral and emergency routes clear. Final access and setup procedures will be published before race day.
MBU is mainly self-supported. Bring your own food, nutrition and personal supplies. Water and a limited supply of Näak drink mix will be provided. Final aid locations and procedures will be included in the Athlete Guide. Crew support is only permitted between yards. No specific on-course aid station is confirmed.
CREW + AID FAQPreparing for after dark
If you plan to continue after dark, prepare a headlamp and backup light. Bring the familiar nutrition, hydration and personal supplies you expect to use between yards.
GEAR + RACE WEEKEND FAQDECEMBER 19, 2026 / THE BASIN