Results/Photos

Date: Sept. 27, 2026 Participant: Ryan Stack #13451 Race: 2026 Boulderthon Marathon Distance: 26.2 miles

Steady Early Pace Gives Way to a Hard-Fought Final Stretch Ryan Stack completed the 2026 Boulderthon Marathon in 4:21:27, averaging 9:58 per mile. His race built on a strong, consistent foundation: from mile 1 through mile 12, he held a tight band between 8:00 and 8:35 per mile, settling into rhythm early and holding form through the race's first third. That stretch stands as the most efficient running of his day, with cumulative pace staying near 8:19 per mile at the halfway point. The back half told a different story. Splits crept past 9:00, then 10:00 by mile 18, and the miles from 19 to 25 slowed further into the 13-15 minute range as fatigue set in on Boulder's high-altitude course, sitting above 5,000 feet. To his credit, Stack found another gear in the final mile, dropping back down to 10:58 to close out the marathon on the Pearl Street Mall.