Miami Backyard Ultra
Miami Backyard Ultra is an ultra and running race on December 19, 2026 in Key Biscayne, FL, with an entry fee of $249.
- Date
- December 19, 2026 (40 days to go)
- Price
- $249
- Sports
- UltraRunning
From the Organizer
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.
Events
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
79°
Typical Low
66°
Chance of Rain
26%
Based on US Climate Normals data from Cape Florida, 2 mi from the venue.
About Key Biscayne, FL
Population
14,560
as of 2023
City Elevation
7 ft
Nearest Airport
MIA
Miami International Airport · 11 mi
Time Zone
Eastern Time
From Endurance Grid
A small town race. Lodging near the start could be limited, so book early.
Race Location
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Miami Backyard Ultra, put it on the calendar, and turn “someday” into a start date.
40
Days to train
- Race
- Miami Backyard Ultra
- Date
- December 19, 2026
Get Ready for Race Day
Plan your training, log every workout, and track your progress all the way to race day in the Endurance Grid app.
More Ultra races near Key Biscayne, FL
Frequently Asked Questions
What is the Miami Backyard Ultra?
When and where is the Miami Backyard Ultra?
How do I register for the Miami Backyard Ultra?
Miami Backyard Ultra
Dec 19, 2026