Monarch Ultra 10km 2025

This page is kept as a past race archive for the Sep 20, 2025 edition in Peterborough, Ontario. Use the links below to find upcoming races in the same area or distance category.

The Monarch Ultra is an annual event that combines conservation, education, and physical activity to raise awareness for monarch butterfly conservation. The 2025 event marks the third annual Monarch Festival & Race, featuring a 10km race and a 1km Kids Fun Run.

The event includes a vibrant festival with live music, local crafts, face painting, and informative booths to educate attendees about the importance of preserving monarch butterflies.

• 10km out-and-back course starting and ending at Millennium Park, 130 King Street, Peterborough
• Route follows the Rotary Trail beside the Otonabee River, mostly flat and fast
• Mixed surfaces primarily on trails along Rotary Trail and TransCanada Trail
• Water station at the 5km turnaround point; participants must bring their own vessels (cup-free event)

• Annual festival with live music, local crafts, and face painting
• Monarch butterfly conservation awareness
• Prizes for best monarch-themed costumes
• 1km Kids Fun Run included alongside the 10km race