Results/Photos

Date: Sept. 27, 2026 Participant: Xavier Renteria #11754 Race: 2026 Boulderthon Marathon Distance: 26.2 miles

Strong Early Pace Gives Way to a Tough Final 5K Xavier Renteria completed the marathon in 4:22:18, an average pace of 10:00 per mile. His race was built on a strong opening: the first six miles clicked by at roughly 8:34 per mile, the fastest sustained stretch of his day. Splits held mostly in the 8:30s and 9:30s through mile 20, keeping his overall rhythm intact for three-quarters of the distance. The final 10K told a different story, with mile splits stretching past 12 and then 14 minutes as fatigue set in through miles 21-25. That fade arrived right around where Boulder's altitude, over 5,000 feet, tends to make itself felt, and near where the lululemon Power-Up Zone sits close to mile 22.5. A pacing plan that banks a touch less early speed could help preserve more strength for that closing stretch.