When
Nov 15, 2026
Starts at 7:30am EST
Weather
Last Year's Race Weather
🌧️ Rain · -4°C–5°C
· Wind 16 km/h
Registration
Open Now
Closes October 31, 2026
Website
Official website →
Event Details
The Fat Ass began in 2003 with 23 participants who didn't quite know what they had gotten themselves into and who fell in love with running the trails of the Batawa. Over the years the Fat Ass has grown to be one of the biggest trail races in Ontario, and despite the size of it, we maintain the inclusive atmosphere so everyone feels welcome; fast, slow, young, old, runners and walkers.
Event type
Ultra
Distance
50.0 km
Surface
Trail
Registration opens
July 1, 2026
Registration closes
October 31, 2026
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