RMRR Fall Marathon Training Series #3 2026

The race.

Rocky Mountain Road Runners hosts the third event in their Marathon Training Series on September 27, 2026, in Thornton, Colorado. Races begin at 7 a.m. at Riverdale Ballfields, 9830 Riverdale Road. Participants can choose between 10-mile and 20-mile distances, with official timing and mile markers throughout the marked courses. Aid stations support runners at multiple points. Winners in each distance category receive ribbons. Custom distances are available by request at the start. Dogs and running strollers are not permitted on the courses. RMRR members receive a 25% discount at checkout with current membership.