Results/Photos

Date: Sept. 27, 2026 Participant: Connor O'Brien #26002 Race: 2026 Boulderthon Half Marathon Distance: 13.1 miles

Early Pace Fades Steadily Over Final Miles Connor O'Brien completed the Half Marathon in 3:16:34. His opening mile was his fastest of the race at 12:10, and he held a strong overall pace through the first four miles, reaching the 4-mile mark with a cumulative pace of 13:08 per mile. From there, his mile splits lengthened gradually, with cumulative pace climbing to 15:01 per mile by the finish as the back half of the course wore on. Running at altitude in Boulder, which sits above 5,000 feet, O'Brien's early miles stood out as the most consistent stretch of his race, with splits tightening from 12:10 to 12:58 to 13:24 across the first three miles before the pace began to loosen through the remainder of the course.