2026 Monarch Ultra 10km

Monarch Ultra 10km takes over Peterborough, Ontario on Saturday, September 19, 2026, bringing runners and families together at Millennium Park for a fall race day with a festival feel. This trail race features a scenic 10K out-and-back route along the Rotary Trail in East City beside the Otonabee River, plus a 1K Kids Fun Run. Expect a community-focused event with conservation and celebration at its heart.

The 10K starts and finishes at Millennium Park and runs an out-and-back route along the Rotary Trail in East City beside the Otonabee River. The course is described as relatively flat and fast, with a hydration station at the 5K turnaround.

• Scenic trail race in downtown Peterborough
• 10K out-and-back course along the Rotary Trail
• Route follows the Otonabee River
• 1K Kids Fun Run at Millennium Park
• Festival atmosphere with music, food, and family activities
• Chip timing for the 10K
• Cup-free setup with a hydration station at 5K