The Onesie Run is Calgary's—and Canada's—only official, dedicated Onesie Run. Scheduled for Saturday, November 15, 2025, the event 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. The event supports the Calgary Humane Society, raising both public awareness and funds for animal welfare.
All participants receive a medallion and ribbon, with special prizes awarded to the fastest runners in both categories. Fur-friends are very welcome; please leash responsibly.