Miami Backyard Ultra
About this race
CAME TO FIND OUT.
One 4.167-mile yard. Every hour. Until one remains.
Miami Backyard Ultra starts December 19, 2026 at 8:00 AM EST at Miami Marine Stadium / Virginia Key. The field is limited to 500 runners.
Maybe it is two yards. Maybe four. Farther than you have ever gone. Through the night. Fifty miles. One hundred. The final yard. Everyone starts the same yard under the same rules.
Complete each yard in less than one hour, recover in the time left, then start with the field at the next hourly bell. There are no late starts, skipped yards, pacers or personal aid during a yard. One runner must complete one more yard than everyone else to win. All other runners technically record a DNF, with completed yards as their official result.
Parking, packet pickup, basecamp, crew access and aid procedures will be published in the Athlete Guide before race weekend. Participant award details coming soon.
Full rules / FAQ
Pick your distance
Trail running
Backyard Ultra
One 4.167-mile yard every hour at Miami Marine Stadium / Virginia Key. Everyone starts under the same rules. Come to find out what the next yard holds.
Typical race-day weather
Based on 3 years of Open-Meteo archive data for this event's race dates in Key Biscayne, plus the 3 days either side.
The sun rises at 7:01 AM and sets at 5:33 PM local time (EST) in Key Biscayne on December 19, 2026 — 10h 32m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Other races near Key Biscayne
Different organizers, within 40 miles, in the next three months
Run For Recovery
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Halloween Trick or Trot Run 5K/10K/13.1 MIAMI
PB&J Fuel Run 5K/10K/13.1 MIAMI
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 44 Key Biscayne events
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