50k Mashup Slam
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Event
The 50K MASHUP SLAM is listed as a series entry in Crystal Lake, IL, on January 10, 2026. The series consists of trail events held across the Midwest and centers on ultramarathon distances. The listing identifies multiple named events that form part of the series.
Distances
- 50K trail races
- 53K (Rockin Rockwoods 53K)
- 9-hour timed event (Dark 2 Dawn)
Series format and awards
The series groups multiple trail races across the calendar year. Participants who complete the series events in the same calendar year become eligible for a finisher buckle. Awards for the series are based on cumulative finish times, with prizes given to the top three finishers by fastest combined times. Finisher buckles and awards are presented at the final event in the series, listed as either G.O.A.T.z 50K or Miner 49'er 50K.
Registration and rules
Registration for the series has a deadline of January 1, 2026. The registration fee for the series is non-refundable. Early registrants by December 1, 2025, are eligible for specific pre-registration or guaranteed-entry opportunities at certain races in the series, subject to limits. Registered series participants receive a special pricing code to use when registering for each individual race; misuse of that code can result in disqualification. Individual races may have field limits and separate registration requirements. Visit the organization's website for the most recent information.
