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34,045EventsUnited States2026
This month
20SAT
23
MAY
Furbutt After Dark 12-Hour Ultra
Lorton, US
SAT
23
MAY
Furbutt After Dark 12-Hour Ultra
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Furbutt After Dark 12-Hour Ultra
Saturday, May 23, 2026 · Lorton, United States
Distances
80.5km
Start location
About this race
The 12-hour Furbutt After Dark ultra uses a backyard format: one hour to complete each 4.167-mile loop. You must be in the corral ready to start the next loop on the hour, or you're out. Runners who quit voluntarily or miss a lap start are eliminated. The last runner standing must complete their final lap solo. This challenging run is excellent for experiencing the backyard format and pushing for a marathon, 50K, or 50-mile distance, as it forces early, frequent rest.