Josie Diffendaffer

United StatesUnited StatesActive
Events
5000 m

Josie Diffendaffer is a United States middle-distance runner. She competes primarily in the 1500m, Mile and 3000m.

Her personal bests include 4:44.43 in the 1500m, 5:08.54 in the Mile, 10:18.94 in the 3000m, 17:34.57 in the 5000m and 37:47.17 in the 10000m. She is currently active on the international athletics circuit, representing United States.

Personal best · 5000 m17:34.57
2026 season best5:20.65Feb 7, 2026 · Hughes Fieldhouse, Maryville, MO (USA) (i)
2026 season best
Last competitionBryan Clay InvitationalApr 16, 2026 · 37:47.17
Bryan Clay Invitational

As of Nov 14, 2026: 5000 m 17:34.57, 2026 season best 5:20.65 (Feb 7, 2026, Hughes Fieldhouse, Maryville, MO (USA) (i)) · Last competition: Bryan Clay Invitational, Apr 16, 2026, 37:47.17

Personal bests

WA points calculator →
DisciplineResultAll-time
1500mCA 2025United States 1500 m all-time list4:44.43875 pts–
MileIndoorKS 20255:08.54885 pts–
3000mIndoorKS 202510:18.94874 pts–
5000mCA 2025United States 5000 m all-time list17:34.57883 pts–
10000mCA 2026United States 10 000 m all-time list37:47.17854 pts–
mile-short-trackIndoorKS 20255:18.05825 pts–

Progression

SeasonDisciplineResultWindDateCompetitions
2026Mile Indoor5:20.65–Feb 7, 2026Bearcat Invite, Hughes Fieldhouse, Maryville, MO (i) - Collegiate
20263000m Indoor10:25.61–Feb 14, 202611th Annual Russ Jewett Indoor Gorilla Classic
202610000m 37:47.17–Apr 16, 2026Bryan Clay Invitational
20251500m 4:44.43–Apr 18, 2025Bryan Clay Invitational
2025Mile Indoor5:08.54–Feb 15, 202510th Annual Russ Jewett Indoor Gorilla Classic, Robert W. Plaster Center, Pittsburg, KS (i)
2025mile-short-track Indoor5:18.05–Jan 17, 2025Washburn Rust Buster, Washburn Indoor Athletic Facility, Topeka, KS (i)
20253000m Indoor10:18.94–Jan 24, 2025Rumble in the Jungle Invitational, Robert W. Plaster Center, Pittsburg, KS (i)
20255000m 17:34.57–Apr 17, 2025Bryan Clay Invitational
FAQ

Frequently asked questions

Josie Diffendaffer's 5000 m personal best is 17:34.57, set on Apr 17, 2025 in Cougar Athletic Stadium, Azusa, CA (USA).

Josie Diffendaffer competes in the 5000 m.

2026 season best: 5:20.65, set on Feb 7, 2026 in Hughes Fieldhouse, Maryville, MO (USA) (i). Last competition: Bryan Clay Invitational on Apr 16, 2026, 37:47.17.