Ostrander, a 14-year-old who has three more years in the junior division, clocked a time of 30 minutes, 32 seconds to shave 43 seconds off the record she set last year.
The time placed her ninth overall in the junior race, a position she claimed by outsprinting a boy at the finish line.
Miles Knotek of Moose Pass claimed the boys' victory with an impressive 26:18. It was short of Bill Spencer's legendary record of 24:34 set in 1973. Knotek, who is 16, was 80 seconds faster than the next fastest runner, 15-year-old Lyon Kopsack of Palmer.
The junior Mount Marathon goes halfway up the 3,022-foot mountain.
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