251
Days Away
A backyard-style race with 4.167-mile loops completed every hour for 4, 8, or 12 hours total. Blitz format times every loop for competitive placement based on both loops completed and cumulative time.
Race Day
May 15, 2027
Registration opens, price changes, race updates: straight to your inbox.
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
Make Race PlanAre you the race director for Butterfield Blitz Backyard?
Claim this race to manage registration, volunteers, and race-day ops on Endurance HQ.