F10-19: Tewson edges Muhlner in a sprint finish for the junior women's crown

• Tamsin Tewson won F10-19 in 2:15:13 (12:05/mi), finishing 20 seconds ahead of runner-up Zoe Muhlner.
• Zoe Muhlner crossed in 2:15:33 — same time on the clock, but the places don't lie: Tewson was ahead.
• Tewson posted the 9th-fastest women's split on the Siberia→Finish leg, a surge that helped her climb from 40th to 23rd among women across the race.
• Jillian Chalstrom, 17, rounded out the three-finisher field in 2:46:19, finishing 81st among women and posting the 66th-fastest women's split on the Siberia→Finish leg.

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Three finishers. Twenty seconds separating first from second. That was the story of the F10-19 race at the 2025 Broken Arrow Skyrace 18K — a tight, hard-fought contest played out across 16.8K of high-Sierra terrain between 6,200 and 8,000 feet, where the thin air and 17 mph winds left no margin for error.

Tamsin Tewson of San Francisco controlled the race with a steady climb through the women's field, moving from 40th among women at the first checkpoint all the way to 23rd by the finish. The decisive moment came on the Siberia→Finish stretch, where she laid down the 9th-fastest women's split on that leg — a closing move that sealed the win at 2:15:13. Washington, D.C.'s Zoe Muhlner matched her almost stride for stride. Muhlner had actually been running stronger in the middle portion of the race — she sat 23rd among women heading into the Siberia checkpoint — but Tewson's finishing kick proved the difference, with the clock showing 2:15:33 for Muhlner and the gap a mere 20 seconds.

Muhlner's 20th-fastest women's split on the KT 22→Siberia segment shows she was genuinely racing the entire field, not just her F10-19 rivals. Both athletes, both 19, pushed each other to a finish that wasn't decided until the very end.

Jillian Chalstrom, the youngest in the field at 17 and racing on home terrain out of Truckee, completed the course in 2:46:19 — a legitimate finish on a demanding mountain course at elevation. She rallied on the back half, posting the 66th-fastest women's split on Siberia→Finish and recovering from 90th among women at the Siberia checkpoint to close 81st at the line.