Results/Photos

Date: Sept. 27, 2026 Participant: Claire Richardson #12198 Race: 2026 Boulderthon Marathon Distance: 26.2 miles

Fast Early Miles Give Way to a Gritty Closing Stretch Claire Richardson, 25, of Littleton, CO, finished the 2026 Boulderthon Marathon in 4:36:13. Her race showed a clear two-part shape: the first 11 miles were remarkably even, holding between 9:00 and 9:40 per mile and settling her elapsed pace at 9:14/mile through mile 11 her strongest stretch of the day. From there, pace gradually eased through the middle miles before a tougher stretch between miles 18 and 23, where per-mile splits climbed into the 11-to-14-minute range. She steadied over the final miles, closing in the 10:30s to finish with an overall elapsed pace of 10:32/mile. Richardson's marathon carried her through Boulder's backroads before finishing on the Pearl Street Mall, all at over 5,000 feet of elevation a backdrop worth noting given the strong pace she carried through the race's early miles.