19Dec
Backyard Ultra
Running
- Distance
- Backyard Ultra
- Start time
- 08:00
- Entry fee
- $249.00
Miami Backyard Ultra
Key Biscayne,
Florida,
United States
41 days left
runsignup.com
Date
19 Dec, 2026
Races
1 distance
Entry fee
$249.00
Runner rating
Be the first to rate
Website
Official website
Miami Backyard Ultra
About the event
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.
Races offered
Weather history
3-year monthly averages for December in Key Biscayne.
Temperature19.1° / 24.8°
Feels like18.2° / 24.5°
Sunshine hours8h 27m
Rainfall4.3 mm
Snowfall—
Wind14.6 km/h (Gentle breeze)
Humidity73.2%
Max UV indexLow (2.4)
Sweat lossHigh
Course conditionsHard and dry surface
Sunrise07:59
Sunset18:33
About Key Biscayne
Learn more about the host city, Key Biscayne.
Key Biscayne is a village in Miami-Dade County, Florida, United States. Located on the island of Key Biscayne, the village is part of the Miami metropolitan area of South Florida. The population was 14,809 at the 2020 census, up from 12,344 in 2010.
Read moreHotels & places to stay
Things to do nearby
Tours and activities near Key Biscayne, powered by Viator.
Runner reviews
Read what other athletes have to say about their experience at the Miami Backyard Ultra.
No reviews yet
Be the first to share your experience with the community!
Suggest an edit
Spotted an error or missing detail about the Miami Backyard Ultra? Help us improve.
Nearby races
Explore other exciting events happening in this same region.
-
Dec 19, 2026
-
Dec 13, 2026
-
Nov 21, 2026
-
Nov 22, 2026
-
Nov 26, 2026
-
Nov 26, 2026
-
Nov 26, 2026
-
Dec 06, 2026
Recommended for you
Hand-picked events we think you’ll love.
-
Nov 08, 2026
The 20th Annual Liquid Youth Fort Lauderdale Running Festiv…
WE HAVE A RACE FOR EVERYONE! 5K 10K HALF MARATHON RELAY HALF MARATHON High-quality T-shirt Finishers medal Professional…
Read more about The 20th Annual Liquid Youth Fort Lauderdale Running Festival -
Nov 08, 2026
Turkey Trails - Tampa
Join us for the annual Turkey Trails 5k/10k/Half Marathon! A fun, Thanksgiving-themed event that is perfect for the who…
Read more about Turkey Trails - Tampa -
Nov 08, 2026
Miles for Meals 5K (AED x Kearney Center)
Alpha Epsilon Delta is excited to announce their 1st annual "Miles for Meals" 5K in support of the Kearney Center! Alph…
Read more about Miles for Meals 5K (AED x Kearney Center) -
Nov 08, 2026
Tom Walker Half Marathon & 5k
The iconic and popular Tom Walker Half Marathon & 5k will return, to the beautiful Gainesville-Hawthorne Trail (this is…
Read more about Tom Walker Half Marathon & 5k -
Nov 08, 2026
Path to Peace 5K/10K
Join us for the 2nd Annual Path to Peace 5K/10K, on Novemeber 08, 2026 a community run dedicated to unity, remembrance,…
Read more about Path to Peace 5K/10K -
Nov 08, 2026
Home Stretch 5K for Homeless and At-Risk Vets
Support your local Veteran community by participating in the Annual Home Stretch 5K for Homeless and At-Risk Vets! Sign…
Read more about Home Stretch 5K for Homeless and At-Risk Vets -
Nov 08, 2026
Miracle Walk & 5K Run for the Down Syndrome Association of …
By participating in our event, you are supporting the inclusion, love and acceptance of people with Down syndrome (Tris…
Read more about Miracle Walk & 5K Run for the Down Syndrome Association of Miami -
Nov 08, 2026
Cafecito5K
CAFECITO5K! ☕🏃♀️🎉 FIVE YEARS. FIVE KILOMETERS. ONE BIG CAFECITO CELEBRATION! CAFECITO5K IS TURNING FIVE! Five years of…
Read more about Cafecito5K