Rieko Koshi

JapanJapanActive
Born
May 1, 1979 (47 years old)
Events
Marathon

Rieko Koshi is a Japan long-distance runner, born on May 1, 1979. She competes primarily in the 5000m and Marathon.

Her personal bests include 17:51.92 in the 5000m and 2:42:20 in the Marathon. She is currently active on the international athletics circuit, representing Japan.

Personal best · Marathon2:42:20
2026 season best2:43:23Mar 1, 2026 · Tokyo
2026 season best
Last competitionNike Melbourne Marathon Festival - MarathonOct 11, 2026 · 2:57:03
Nike Melbourne Marathon Festival - Marathon

As of Nov 14, 2026: Marathon 2:42:20, 2026 season best 2:43:23 (Mar 1, 2026, Tokyo (JPN)) · Last competition: Nike Melbourne Marathon Festival - Marathon, Oct 11, 2026, 2:57:03 · 47 years old

Personal bests

WA points calculator →
DisciplineResultAll-time2026
5000mTokyo 2021Japan 5000 m all-time list17:51.92854 pts––
MarathonOita 2025Japan Marathon all-time list2:42:201,006 pts–#916

Progression

SeasonDisciplineResultWindDateCompetitions
2026Semi 1:18:26–Jan 11, 2026Tokyo New Year Half Marathon
2026Marathon 2:43:23–Mar 1, 2026Tokyo Marathon
2025Marathon 2:42:20–Feb 2, 202573rd Beppu-Oita Mainichi Marathon, Oita
2024Marathon 2:43:40–Feb 4, 202472nd Beppu-Oita Mainichi Marathon
2023Marathon 2:43:07–Mar 5, 2023Tokyo Marathon
2022Marathon 2:49:47–Mar 13, 2022Nagoya Women's Marathon
20215000m 17:51.92–Sep 23, 2021Toneri Park Athletic Field, Tokyo (JPN)
2021Marathon 2:47:27–Dec 19, 202152nd Hofu Yomiuri Marathon, Hofu
FAQ

Frequently asked questions

Rieko Koshi's Marathon personal best is 2:42:20, set on Feb 2, 2025 in Oita (JPN).

Rieko Koshi competes in the Marathon.

2026 season best: 2:43:23, set on Mar 1, 2026 in Tokyo (JPN). Last competition: Nike Melbourne Marathon Festival - Marathon on Oct 11, 2026, 2:57:03.