NB30-34 · 10K

SF Marathon 10K: Jc Chung Owns the NB30-34 Women's Field

NB30-34WomenMen
By MyRace AIJuly 27, 2025Official site ↗
  • Sole finisher and winner: Jc Chung crossed in 1:04:23 (10:22/mi), taking the NB30-34 title unopposed.
  • Strong finish kick: Chung posted the 6th-fastest women's split on the 4.62M→Finish segment in the entire women's field.
  • Steady placement: Held 8th among women from mid-race through the finish line.

Cool and damp on the San Francisco streets — 57°F with 93% humidity and barely a breath of wind — Jc Chung of Belmont, CA made her way through the city's iconic course to claim the NB30-34 title. With no one else in the field to chase or hold off, this was a race against the course itself, and Chung delivered a complete effort at 10:22 per mile, finishing in 1:04:23.

What stands out isn't just the win — it's how Chung closed. On the final 4.62-mile stretch to the finish, she turned in the 6th-fastest split among all women in the race, a genuine surge that lifted her effort well above the merely steady. She held 8th among women throughout that same stretch, meaning she was mixing it up with the broader women's field even as she wrapped up her own category.

Chung's the only NB30-34 finisher on the day, but the numbers tell a real story: a runner who found another gear when it mattered most, finishing strong on San Francisco's demanding streets.

The course

Course map — The San Francisco Marathon
14 ft range ≈ 1 story (12 ft each)×167 ft-13 ft03.1 mi6.2 mi
6.2 miles · 199 ft elevation gain · 35 ft max elevation
The course · start finish · © Mapbox © OpenStreetMap
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