Results/Photos

Date: Sept. 27, 2026 Participant: Colby Michaelis #26351 Race: 2026 Boulderthon Half Marathon Distance: 13.1 miles

Negative Split Surge Powers Strong Half Marathon Finish Colby Michaelis completed the 2026 Boulderthon Half Marathon in 1:50:25, an 8:25 min/mile pace, out of a field of 7,223 in downtown Boulder. Michaelis opened steadily, settling near a 9:10 min/mile pace through the first three miles, then built momentum throughout the back half. Miles 9 through 13 were his strongest stretch, dropping from an 8:49 elapsed pace down to 8:26 by the finish, with standout splits of 7:53 and 7:25 along the way. That late surge, capped by a swift final mile, reflects strong pacing discipline and a well-managed effort at altitude, with Boulder sitting over 5,000 feet.