Arai, Koji

Born 19662013 – 2026

Events

2013 – 2026

Best pace

8.352

km/h · 2015

Best finish

10th

of 65 · 2026

Distance raced

4,396

km · splits not double-counted

Pace over time

km/h · higher is faster

Actual pace
Age-graded pace

Results

Every result for this runner in date order. Splits of a race are indented and are not counted again in the distance total.
Date	Event	Distance	Result	Pace km/h	Placing
2013-09-29	SkyView Ultra-TrailJapan*Tokyo	50km	9:40:17 h	5.170	224/375
2014-04-26	Shizuoka to Yamanashi (STY)Japan*Tokyo	88km	22:40:21 h	3.881	574/691
2014-06-01	Tokyo Shibamata 100 kmJapan	100km	13:42:47 h	7.292	501/633
2014-09-20	SkyView Ultra-Trail - Yamada Noboru Memorial CupJapan	120km	30:19:45 h	3.957	318/385
2015-03-15	Izu Trail JourneyJapan*Tokyo	72km	12:06:59 h	5.942	552/1154
2015-06-22	Ultramarathon OkumusashiJapan*Tokyo	77km	9:13:08 h	8.352	589/1376
2015-07-04	Utsukushigahara 80 Km Trail RunJapan	80km	14:14:51 h	5.615	266/468
2015-07-19	SkyView Ultra-Trail - Yamada Noboru Memorial CupJapan*Tokyo	118km	28:45:54 h	4.102	161/263
2015-10-31	Hasetsune Cup - Japan Mountain Endurance RaceJapan	71.5km	14:10:43 h	5.043	740/2045
2016-06-18	Aijiangshan Trail Series - LingshanChina	48km	10:58:07 h	4.376	39/90
2016-08-15	Chongli 100 Ultra Sky Trail Challenge - 100 Km RunChina	100km	24:17:31 h	4.117	119/319
2017-03-18	Hangzhou 100 Ultra Trail RaceChina	100km	28:14:41 h	3.540	53/63
2017-04-09	Jingxigudao Cyclo CrossChina	46km	8:35:10 h	5.357	12/33
2017-05-02	Yading Kora UltraChina	46km	13:46:24 h	3.340	82/94
2017-05-20	Shangri-La Meili 100 KmChina	100km	27:50:19 h	3.592	21/42
2017-07-15	Transqilian Run 108kmChina	108km	23:40:53 h	4.561	36/60
2017-08-11	Chongli 100 Ultra Sky Trail ChallengeChina	168km	40:53:50 h	4.108	15/31
2018-03-09	Mt. Gaoligong Ultra 100 MilesChina	100mi	41:00:09 h	3.925	169/193
2019-06-29	Phoenix Ridge Night RaidChina	50km	12:30:30 h	3.997	85/108
2019-09-14	Huanglong Extreme Endunrance Race - Uthl 100China	100km	30:24:02 h	3.289	38/39
2020-09-05	Trail Mt Wugong 100 KmChina	100km	25:47:45 h	3.877	44/80
2022-05-27	Karuizawa Trail Running RaceJapan*Tokyo	45km	8:45:09 h	5.141	276/383
2022-07-17	Nozawa Onsen 4100D Mountain TrailJapan*Tokyo	65km	13:07:27 h	4.953	272/443
2022-09-04	OSJ Adatara Trail 50KJapan	53.4km	11:29:24 h	4.648	140/197
2022-10-07	Lake Biwa 100Japan	169km	2d 03:50:37 h	3.260	174/175
2022-12-29	Kyoto Great Round 130 kmJapan	130km	30:47:32 h	4.222	92/92
2023-04-21	Ultra-Trail Mt. Fuji (UTMF)Japan*Tokyo	167km	41:52:17 h	3.988	1253/1687
2023-07-08	Shiga Kogen 100Japan*Tokyo	100km	23:22:20 h	4.279	224/335
2023-09-03	OSJ Adatara Trail 50KJapan	53.4km	12:17:12 h	4.346	94/219
2023-10-06	Lake Biwa 100Japan	169km	2d 01:06:49 h	3.441	203/248
2023-11-05	Koshu Alps Haute Route ChallengeJapan	68km	14:21:39 h	4.735	92/230
2023-12-29	Kyoto Great Round 130 kmJapan	130km	29:30:00 h	4.407	60/105
2024-05-12	FunTrails Round MinanoJapan*Tokyo	51km	7:50:16 h	6.507	111/494
2024-05-24	Tokyo Grand Trail - 100miJapan	160km	43:47:34 h	3.654	40/93
2024-11-16	FunTrails100K RoundJapan*Tokyo	100km	24:41:51 h	4.049	117/415
2024-12-29	Kyoto Great Round 130 kmJapan	130km	30:26:34 h	4.270	114/129
2025-04-12	Tokai Peninsura Giant Trail 100Japan	160km	34:41:53 h	4.611	42/48
2025-05-11	FunTrails Round MinanoJapan*Tokyo	51km	8:27:32 h	6.029	172/483
2025-05-30	Tokyo Grand Trail - 100miJapan	160km	46:39:38 h	3.429	59/81
2025-10-12	OSJ Koumi 100Japan*Tokyo	100mi	34:14:52 h	4.699	87/123
2025-12-28	Kyoto Great Round 130 kmJapan	130km	29:21:57 h	4.427	110/168
2026-04-11	Amagase Trail 80 kmJapan	80km	13:25:36 h	5.958	10/65
2026-05-22	Tokyo Grand Trail - 100miJapan	160km	42:19:49 h	3.780	42/110