The Onesie Run is Calgary's—and Canada's—only official, dedicated Onesie Run. Scheduled for Saturday, November 15, 2025, it features 1 km and 5 km routes suitable for all fitness levels. Participants are encouraged to wear their coziest onesies while walking, jogging, or running.

Supporting the Calgary Humane Society, this event raises awareness and funds for animal welfare. All participants receive a medallion and ribbon, with special prizes awarded to the fastest runners in both categories.

- Race surface: Road
- Routes include 1 km and 5 km distances
- Participants can walk, jog, or run
- Fur-friends allowed, please leash responsibly
- Suitable for all ages and fitness levels

- 1 km and 5 km routes suitable for all fitness levels
- Participants encouraged to wear cozy onesies
- Medallion and ribbon awarded to all participants
- Special prizes for fastest 1st, 2nd, and 3rd place in 1 km (kids) and 5 km
- Youth and children (18 and under) tickets at a reduced price
- Fur-friends welcome with leash responsibility