Results/Photos

Date: Sept. 27, 2026 Participant: Silis Tuannguyen #10645 Race: 2026 Boulderthon Marathon Distance: 26.2 miles

Steady Pace Through Altitude Powers Marathon Finish Silis Tuannguyen completed the 2026 Boulderthon Marathon in 4:05:44, finishing 5th in the M 55-59 division. His race showed remarkable consistency, holding between 9:00 and 9:20 per mile through the first two-thirds of the course before a natural late-race dip past mile 20, then rallying over the final mile to close in 9:06 pace. His strongest stretch came between miles 9 and 12, where he clicked off consecutive splits of 8:47, 8:54, 8:14, and 8:57 a sustained surge that was the fastest sustained running of his day. That mile 11 split, in particular, stands out as his quickest of the race. Given Boulders elevation above 5,000 feet, maintaining that pace mid-race reflects strong pacing discipline before the return through the Power-Up Zone near mile 22.5 and on to the Pearl Street Mall finish.