Hideki (大河原秀樹) Okawara
Born : 1974 Cat. M50 Ultrarunner since 2017 JPN
27
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
60
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?JPNJapan
13,4%
Rank quotient ?This runner's calculation uses 27 eligible race(s): Σ(rank − 1) = 1 934; Σ finishers = 14 452. 1 934 / 14 452 × 100 = 13.38%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed27
Km — ultra races4 467 km
> 100 km16
> 160 km13
> 200 km8
> 24h5
> 48h4
Longest race429,2 km

Km per year (ultra races)

100
1 race
2022
879
7 races
2023
719
5 races
2024
1 348
5 races
2025
872
3 races
2026

Race types (share of distance)

Road38,3%
Trail29,2%
Elim.32,4%

Wins & podiums (ultra)

🏆 Win1
🏆 Win M3
🏅 Top 33
🏅 Top 3 M3
Longest winning streak1
Current streak0

HISTORY

27 race(s) · 1 split(s) nested
DateRacePerf.Rk
2026
23.05 24h JPNIAU 24h Asia and Oceania Championships Open 183.750 km20
03.05 259km JPN21st River Road Foot Race 259km 33:58:58 h2 🥈
03.04 Backyard Ultra JPN7th Last Samurai Standing Backyard Ultra - Kijimadaira 429.184 km (64h)7
2025
22.11 Backyard Ultra JPN6th Last Samurai Standing Backyard Ultra - Tokyo 415.772 km (62h)2 🥈
13.09 250km JPN8th Utsukushima Fukushima Journey Run 250K 33:40:53 h1 🏆
20.04 120km JPN35th Fuji 5 Lakes Sparta Challenge 11:46:50 h50
15.03 260km JPN15th Little Edo Oedo 260k 33:47:41 h5
20.02 Backyard Ultra JPN1st Last Samurai Standing Big's Challenge Cup 301.770 km (45h)7
2024
08.12 70km JPN11th Izu Trail Journey 8:58:26 h105
01.11 Backyard Ultra JPN5th Last Samurai Standing Backyard Ultra - Tokyo 301.770 km (45h)4
22.09 75km JPN2nd Mina no Tenku Ultra Marathon 7:24:27 h7
08.06 105km JPN2nd Okumusashi Long Trail Race 105K 24:23:57 h46
26.04 167km JPN9th Ultra-Trail Mt. Fuji 30:56:06 h135
2023
10.12 70km JPN10th Izu Trail Journey 8:48:40 h97
16.09 162.6km JPN15th Shinetsu Five Mountains Trail 100 mile 27:42:17 h49
16.07 109.2km JPN15th OSJ Ontake 100km Ultra Trail 12:48:02 h37
04.06 78km JPN30. Ultramarathon Okumusashi 7:44:53 h75
28.05 62km JPN15th OSJ Okukuji Trail 60k 12:27:17 h45
21.04 167km JPN8th Ultra-Trail Mt. Fuji 31:10:33 h230
11.03 230km JPN13th Little Edo Oedo 230k 32:11:43 h11
2022
04.06 100km JPN2nd Minakami Trail Race - 100km 21:41:31 h17
2021
09.10 168.5km JPN7th OSJ Koumi 100 33:49:09 h166
25.04 50km JPN14th Ishioka Trail Run 5:10:11 h26
2019
21.09 75km JPN6th SkyView Ultra-Trail 70 - Yamada Noboru Memorial Cup 13:48:05 h50
02.06 78km JPN26. Ultramarathon Okumusashi 7:15:54 h95
21.04 100km JPN29th Fuji 5 Lakes 100 km Challenge 9:20:16 h53
2017
04.06 78km JPN24. Ultramarathon Okumusashi 9:25:48 h619