Results/Photos

Date: Sept. 27, 2026 Participant: Sera Chun #24104 Race: 2026 Boulderthon Half Marathon Distance: 13.1 miles

Fast Start Fuels a Long, Steady Half Marathon Sera Chun completed the Boulderthon Half Marathon in 3:00:50, anchored by her fastest mile of the day right out of the gate an 11:49 opening split. From there, her per-mile pace eased steadily, climbing from an elapsed 12:00 min/mile pace at the two-mile mark to 13:48 min/mile at the finish, reflecting a race that gradually settled rather than surged. Miles 6 through 11 were her most demanding stretch, with splits drifting into the 14- and 15-minute range, including a 15:53 mile 11. She found a lift near the mile 9.5 Power-Up Zone, trimming her mile 9 split to 14:07 after a slower mile 8, before closing with a stronger mile 12. Running at altitude above 5,000 feet in Boulder adds useful context to that pacing arc across the second half.