Results/Photos

Date: Sept. 27, 2026 Participant: Sean Sullivan #11255 Race: 2026 Boulderthon Marathon Distance: 26.2 miles

Steady Miles Give Way to a Strong Late Surge Sean Sullivan finished the Boulderthon Marathon in 3:58:23, holding a consistent 9:00-9:10 min/mile pace through the middle miles of the race. His strongest mile-plus stretch came between miles 15 and 17, where he ran 8:21, 8:20, and 8:29, pulling his cumulative pace down to 8:53 min/mile at that point his fastest cumulative mark of the race. The closing miles brought some fatigue, with splits climbing into the 9:47-10:17 range between miles 22 and 25, before he rallied for an 8:21 final mile. Sullivan's race unfolded at altitude, with Boulder sitting above 5,000 feet, and the course wound out past Boulder County backroads before finishing on the Pearl Street Mall in downtown Boulder.