Results/Photos

Date: Sept. 27, 2026 Participant: Zoe Tsetsilas #10043 Race: 2026 Boulderthon Marathon Distance: 26.2 miles

Steady Early Pace Fades Late in Marathon Debut Zoe Tsetsilas completed the 2026 Boulderthon Marathon in 4:32:25, an average pace of 10:23 per mile, finishing 214th among women. Her race followed a clear arc: the opening six miles clicked by near a 9:00 pace, holding at 8:57 through mile 1 and staying inside 9:12 through mile 6. From there, mile splits gradually lengthened, drifting into the 9:20-10:14 range between miles 7 and 14. The back half saw a steeper decline, with splits settling into the 11:00-12:30 range from mile 18 onward. The strongest stretch of the day was clearly miles 1 through 6, run at a consistent sub-9:10 clip before the effort eased. Given Boulder's elevation above 5,000 feet, that early pace stands out as the day's high point.