Lost Our Marbles

Event overview

Lost Our Marbles is an indoor ultra marathon held in Regina, Saskatchewan. The event is scheduled for November 29, 2025 at 1717 Elphinstone Street and is in its second year. Sixteen participants are listed for the event.

Format and logistics

The event offers the following timed challenges:

• 3 hour challenge
• 6 hour challenge
• 12 hour challenge

Lap distance is tracked using marbles: each completed lap earns one marble placed in a personal tin, and total marbles determine the final distance. The event is self supported and there is no aid station. Two accessible water fountains with bottle access are available, and there are clean change rooms and washrooms. Food is not allowed on the track; a crew/event support area is adjacent to a food court where food may be consumed. Participants have a safe place to store supplies and a chair next to the track for rest. At the end of the event all marbles are placed in a bin and participants may make one guess; the closest guesses win donated prizes to be announced. All participants receive a participation item. Cash donations collected day of event will go to CMHA Regina Branch. Registration fees listed are $56.28 for the 3 hour, $67.09 for the 6 hour, and $77.91 for the 12 hour; the listed registration window is Jul 1 - Nov 21. Visit the organization's website for the most recent information.