Results/Photos

Date: Sept. 27, 2026 Participant: Jacob Cosper #10439 Race: 2026 Boulderthon Marathon Distance: 26.2 miles

Fast Start Carries Through a Long Closing Stretch Jacob Cosper finished the marathon in 4:00:53. He opened strong, holding between 7:28 and 7:52 per mile through the first eleven miles and settling into a cumulative pace near 7:42 the most consistent stretch of his race. The middle miles slowed gradually into the 910 minute range by mile 18, with the toughest patch coming at miles 19 and 20, both run at 12:42. From there, Cosper steadily clawed his pace back down, closing at 9:01 by the finish. Cosper's race ended on the historic Pearl Street Mall in downtown Boulder, the finish line shared by every distance in the event. Covering the full 26.2 miles at Boulder's elevation of over 5,000 feet adds context to the overall effort behind his final time.