Ultra Series

Switchback Endurance is putting on an ultra series! We have listened to feedback and are now delivering to you the FIRST ultra series event in Michigan. Run a 50k or longer distance at our four Southwest Michigan races in the time allowed, enter the series, and you will receive a one of a kind embroidered finisher jacket! This event starts January 4, 2020 with our Yankee Springs Winter Challenge and ends with our Fall Trail Festival on October 3, 2020. Sign up and be one of the first to complete the series and earn the prestigious finisher jacket!

Series Finisher Award: The series finisher award is a Stio Azure insulated jacket, a $219 retail value, embroidered with “Switchback Endurance Series Finisher”.


  • Yankee Springs Winter Challenge 50k or 50 mile, January 4
  • Yankee Springs Trail Run 50k or 100k, May 30
  • Dirty Burg 50k, July 11
  • Yankee Springs Fall Trail Running Festival 50k, October 3

Sign up for the series, and sign up for each race separately.

Series Prices:

register by January 30 February 1-March 31 April 1-May 31
$90 $110 $130

The deadline to sign up for the series is the Yankee Springs Trail Run Weekend.

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