Lost Our Marbles
North Central, Canada • 29 Nov 2025
Event overview
Lost Our Marbles is an indoor ultra marathon held at 1717 Elphinstone Street, Regina, SK, Canada on November 29, 2025. The event is in its second year and offers three timed challenges based on duration:
- 3 hour challenge
- 6 hour challenge
- 12 hour challenge
Lap totals are tracked with a marble system: each completed lap requires placing a marble into a personal tin. Final marble counts determine each participant's total distance.
Logistics and entry
The event is self supported and does not provide an aid station. There are two readily accessible fountains with bottle access, plus clean change rooms and washrooms. Food is not allowed on the track; a crew/event support area is located next to the food court where food may be consumed. Participants have a safe place to store supplies and a chair provided next to the track for rest periods.
At the end of the event all marbles are placed into a bin and participants may guess the total; closest guesses win donated prizes. Every participant receives a participation item. Cash donations accepted on the day will be given to CMHA Regina Branch.
Registration fees listed for the event: Visit the organization's website for the most recent information.
- 3 hour: $56.28
- 6 hour: $67.09
- 12 hour: $77.91