Yumi Kozasu

Yumi Kozasu

JapanJapan
Born
Aug 1, 1997 (29 years old)
Events
Half Marathon · 5000 m

Yumi Kozasu is a Japan long-distance runner, born on August 1, 1997. She competes primarily in the 3000m, 5000m and 10000m.

Her personal bests include 9:57.30 in the 3000m, 16:34.04 in the 5000m, 36:09.29 in the 10000m and 1:15:04 in the Semi. She is currently active on the international athletics circuit, representing Japan.

Personal best · Half Marathon1:15:04
2025 season best18:24.79May 25, 2025 · Prefectural Stadium, Kumagaya
2025 season best
Personal best · 5000 m16:34.04
Last competition67th East Japan Corporate Athletics Championships, Prefectural Stadium, KumagayaMay 25, 2025 · 18:24.79
67th East Japan Corporate Athletics Championships, Prefectural Stadium, Kumagaya

As of Nov 14, 2026: Half Marathon 1:15:04, 5000 m 16:34.04, 2025 season best 18:24.79 (May 25, 2025, Prefectural Stadium, Kumagaya (JPN)) · Last competition: 67th East Japan Corporate Athletics Championships, Prefectural Stadium, Kumagaya, May 25, 2025, 18:24.79 · 29 years old

Personal bests

WA points calculator →
DisciplineResultAll-time
3000mYokohama 2022Japan 3000 m all-time list9:57.30922 pts–
5000mAbashiri 2023Japan 5000 m all-time list16:34.04988 pts–
10000mOsaka 2018Japan 10 000 m all-time list36:09.29930 pts–
SemiOkayama 2016Japan Half Marathon all-time list1:15:041,028 pts–

Progression

SeasonDisciplineResultWindDateCompetitions
20255000m 18:24.79–May 25, 202567th East Japan Corporate Athletics Championships, Prefectural Stadium, Kumagaya
2024Semi 1:21:25–Dec 15, 2024The 43rd SANYO Ladies Road Race
20235000m 16:34.04–Jul 8, 2023Hokuren Distance Challenge 2023 - Abashiri, Athletic Track, Abashiri
20223000m 9:57.30–Sep 17, 2022NITTAIDAI Athletic Stadium, Yokohama (JPN)
20225000m 16:58.65–Oct 1, 2022NITTAIDAI Athletic Stadium, Yokohama (JPN)
20195000m 17:07.87–Jul 17, 2019Kitami (JPN)
201810000m 36:09.29–May 11, 2018Osaka (JPN)
2016Semi 1:15:04–Dec 23, 2016Okayama (JPN)
FAQ

Frequently asked questions

Yumi Kozasu's Half Marathon personal best is 1:15:04, set on Dec 23, 2016 in Okayama (JPN).

Yumi Kozasu competes in the Half Marathon and 5000 m.

2025 season best: 18:24.79, set on May 25, 2025 in Prefectural Stadium, Kumagaya (JPN). Last competition: 67th East Japan Corporate Athletics Championships, Prefectural Stadium, Kumagaya on May 25, 2025, 18:24.79.