James Kerby

Born : 1963 Cat. M60 Ultrarunner since 1995

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

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

Countries visited ?

Switzerland

United States

8,0%

Rank quotient ?This runner's calculation uses 98 eligible race(s): Σ(rank − 1) = 756; Σ finishers = 9 456. 756 / 9 456 × 100 = 7.99%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed98

Km — ultra races7 902 km

> 100 km15

> 160 km15

Longest race160,9 km

36th Wasatch Front 100 Mile — 11/9/2015

Km per year (ultra races)

2022

100

2023

285

2024

2025

2026

Race types (share of distance)

Road4,4%

Trail95,6%

Wins & podiums (ultra)

🏆 Win21

🏆 Win M21

🏅 Top 343

🏅 Top 3 M43

Longest winning streak2

Current streak0

Records

50 km3h40'43 100 km9h00'40 50 mi5h54'37 100 mi15h37'26 12 h86,50 km

HISTORY

98 race(s)

Date		Race	Perf.	Rk
2025
24.05	55km	2nd Leavenworth Trail Fest	6:57:22 h	17
2024
09.08	100km	7. Swiss Alps 100 - 100km	21:25:51 h	47
22.06	50mi	5th Bears Ears 50mi Ultra Race	11:02:47 h	22
09.06	50km	3rd Hiawatha Trail Run	4:21:18 h	7
25.05	55km	1st Leavenworth Trail Fest	6:48:13 h	11
2023
15.07	100km	10th Beaverhead 100K Endurance Run	15:42:39 h	40
2021
11.12	50km	19th Pigtails Run 50K	5:36:36 h	18
2015
11.09	100mi	36th Wasatch Front 100 Mile	24:56:43 h	15
25.07	50mi	23rd White River 50 Mile Trail Run	8:56:36 h	32
20.06	50km	5th Taylor Mountain 50 km Trail Run	4:41:53 h	1 🏆
2014
14.06	100mi	2nd Bryce 100 Mile Trail Run	23:42:45 h	4
26.04	50mi	11th Capitol Peak 50 Miler	8:30:00 h	12
12.04	50km	5th Squak Mountain 50 km Trail Run	5:29:59 h	6
28.03	50km	4th Badger Mountain 50 km Challenge	4:50:53 h	6
2013
21.09	50km	18th Cle Elum Ridge 50k	5:32:09 h	5
24.02	50km	6th Lord Hill Trail Run	4:57:08 h	7
2012
07.09	100mi	22th Superior Fall Trail Races 100 Mile	24:47:19 h	6
28.07	50mi	20th White River 50 Mile Trail Run	8:37:31 h	43
11.05	50mi	1st The Zion 50 Mile Run	9:19:38 h	8
2011
30.07	50mi	19th White River 50 Mile Trail Run	8:56:56 h	35
12.06	50km	1st Beacon Rock 50K	5:27:33 h	8
22.01	50km	8th Pigtails Run 50K	4:10:54 h	4
2009
11.07	50km	5th Grey Rock Trail Run	4:56:38 h	3 🥉
20.06	50km	3rd The 20th Century 50K Trail Run	3:40:43 h	1 🏆
2008
13.09	50km	14th Cle Elum Ridge 50k	5:26:00 h	12
2007
21.07	100mi	19th Vermont 100 Mile Endurance Race	16:11:09 h	2 🥈
02.06	36Miles	4th Blanchard Mountain Trail Ultra 36miles	6:55:00 h	1 🏆
19.05	12h	3rd Watershed Preserve 12 Hr Trail Race	51.901 km	39
28.04	50mi	4th Capitol Peak 50 Miler	7:31:50 h	1 🏆
22.04	50mi	24th Mt. Si 50 Miles Ultra Run	6:09:07 h	1 🏆
17.03	50km	15th Chuckanut 50K	4:43:58 h	16
2006
18.11	50mi	44th JFK 50 Mile	6:36:34 h	8
07.10	50km	5th Baker Lake 50K Ultra Trail Run	4:15:19 h	1 🏆
16.09	50km	12th Cle Elum Ridge 50k	4:52:55 h	1 🏆
24.06	100mi	33th Western States 100 Mile Endurance Run	20:03:18 h	6
20.05	12h	2nd Watershed Preserve 12 Hr Trail Race	86.502 km	9
23.04	50mi	23rd Mt. Si 50 Miles Ultra Run	6:18:05 h	1 🏆
15.04	50mi	3rd Capitol Peak 50 Miler	8:22:35 h	4
14.01	100mi	6th HURT 100 Endurance Run 100 Mile	26:38:00 h	2 🥈
2005
27.08	31.5mi	8th Tamalpa Headlands 50K	4:20:21 h	9
30.07	50mi	13th White River 50 Mile Trail Run	7:50:00 h	8
25.06	100mi	32th Western States 100 Mile Endurance Run	18:01:33 h	5
30.04	100km	10th Miwok 100k Trail race	9:00:40 h	7
17.04	50km	22nd Mt. Si 50 km Ultra Run	3:49:21 h	3 🥉
26.03	100km	1st ORRC March Mudness 100 km Ultramararathon	9:34:36 h	1 🏆
05.03	50mi	15th Old Pueblo 50 Mile Endurance Run	7:33:27 h	3 🥉
22.01	34mi	3rd Capitol Peak MegaFatAss	5:07:00 h	2 🥈
08.01	50km	10th Bridle Trails Winter Running Festival	3:46:06 h	3 🥉
2004
13.11	50km	11th Ron Herzog 50K	4:59:18 h	7
02.10	100mi	14th Arkansas Traveller 100	15:37:26 h	1 🏆
31.07	50mi	12th White River 50 Mile Trail Run	7:54:28 h	12
13.03	50km	12th Chuckanut 50K	4:21:02 h	4
21.02	50km	4th Hagg Lake Trail Runs 50K	3:58:57 h	2 🥈
07.02	50km	1st Lord Hill Trail Run	4:41:00 h	4
24.01	34mi	2nd Capitol Peak MegaFatAss	5:12:00 h	3 🥉
10.01	50km	9th Bridle Trails Winter Running Festival	3:45:32 h	2 🥈
2003
27.04	50mi	20th Mt. Si 50 Miles Ultra Run	6:04:00 h	1 🏆
2002
27.07	50mi	10th White River 50 Mile Trail Run	7:40:05 h	9
29.06	100mi	29th Western States 100 Mile Endurance Run	18:11:27 h	5
06.04	50mi	23rd American River 50 Mile Endurance Run	6:21:32 h	2 🥈
02.03	50mi	12th Old Pueblo 50 Mile Endurance Run	7:45:59 h	4
2001
22.09	50km	7th Cle Elum Ridge 50k	4:47:32 h	1 🏆
18.08	100mi	19th Leadville Trail 100 Mile	22:29:53 h	14
28.07	50mi	9th White River 50 Mile Trail Run	8:21:15 h	26
19.05	50mi	16th Silver State 50 Miles	7:41:44 h	1 🏆
08.04	50mi	18th Mt. Si 50 Miles Ultra Run	5:54:37 h	1 🏆
17.03	50mi	15th Crown King Scramble 50M	7:59:12 h	2 🥈
17.02	50km	1st Hagg Lake Trail Runs 50K	3:45:56 h	1 🏆
2000
11.11	50km	9th Ron Herzog 50K	4:15:00 h	3 🥉
29.07	47.6mi	8th White River 50 Mile Trail Run	7:31:41 h	5
03.06	100mi	22nd Old Dominion 100 Mile Endurance Run	17:01:55 h	2 🥈
09.04	56mi	17th Mt. Si 50 Miles Ultra Run	6:22:12 h	1 🏆
18.03	50km	8th Chuckanut 50K	4:22:44 h	3 🥉
15.01	50km	5th Bridle Trails Winter Running Festival	4:31:50 h	7
1999
11.09	100mi	20th Wasatch Front 100 Mile	23:31:00 h	7
24.07	47.6mi	7th White River 50 Mile Trail Run	7:00:00 h	4
06.05	50mi	4th Winterhawk 50 Mile Trail Run	6:53:00 h	2 🥈
11.04	52mi	16th Mt. Si 50 Miles Ultra Run	6:52:35 h	1 🏆
13.03	50km	7th Chuckanut 50K	4:29:23 h	4
1998
14.11	50km	7th Ron Herzog 50K	4:11:50 h	2 🥈
12.09	100mi	19th Wasatch Front 100 Mile	25:52:00 h	25
25.07	47.6mi	6th White River 50 Mile Trail Run	7:29:02 h	3 🥉
06.06	50mi	3rd Winterhawk 50 Mile Trail Run	6:37:00 h	2 🥈
19.04	83km	15th Falls to Gasworks Ultra Run	6:35:11 h	1 🏆
21.03	50km	6th Chuckanut 50K	4:26:01 h	4
17.01	50km	3rd Bridle Trails Winter Running Festival	4:16:53 h	2 🥈
1997
27.09	50km	3rd Cle Elum Ridge 50k	4:56:02 h	3 🥉
28.06	100mi	24th Western States 100 Mile Endurance Run	22:36:18 h	55
27.04	83km	14th Falls to Gasworks Ultra Run	6:37:47 h	1 🏆
15.03	50km	5th Chuckanut 50K	4:39:20 h	5
18.01	50km	2nd Bridle Trails Winter Running Festival	4:19:15 h	2 🥈
1996
14.09	50mi	9th McKenzie River 50 Mile Trail Run	8:22:00 h	1 🏆
29.06	100mi	23rd Western States 100 Mile Endurance Run	24:46:30 h	80
01.06	50mi	2nd Winterhawk 50 Mile Trail Run	7:52:45 h	5
21.04	83km	13th Falls to Gasworks Ultra Run	6:48:25 h	1 🏆
20.01	50km	1st Bridle Trails Winter Running Festival	5:50:08 h	6
1995
30.09	50km	1st Cle Elum Ridge 50k	5:22:05 h	6
29.07	47.6mi	3rd White River 50 Mile Trail Run	8:24:16 h	6

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	11/9/2015	36th Wasatch Front 100 Mile	160,93	×2
✓ 2	14/6/2014	2nd Bryce 100 Mile Trail Run	160,93	×2
✓ 3	7/9/2012	22th Superior Fall Trail Races 100 Mile	160,93	×2
✓ 4	21/7/2007	19th Vermont 100 Mile Endurance Race	160,93	×2
✓ 5	24/6/2006	33th Western States 100 Mile Endurance Run	160,93	×2
✓ 6	14/1/2006	6th HURT 100 Endurance Run 100 Mile	160,93	×2
✓ 7	25/6/2005	32th Western States 100 Mile Endurance Run	160,93	×2
✓ 8	2/10/2004	14th Arkansas Traveller 100	160,93	×2
✓ 9	29/6/2002	29th Western States 100 Mile Endurance Run	160,93	×2
✓ 10	18/8/2001	19th Leadville Trail 100 Mile	160,93	×2
✓ 11	3/6/2000	22nd Old Dominion 100 Mile Endurance Run	160,93	×2
✓ 12	11/9/1999	20th Wasatch Front 100 Mile	160,93	×2
✓ 13	12/9/1998	19th Wasatch Front 100 Mile	160,93	×2
✓ 14	28/6/1997	24th Western States 100 Mile Endurance Run	160,93	×2
✓ 15	29/6/1996	23rd Western States 100 Mile Endurance Run	160,93	×2
✓ 16	9/8/2024	7. Swiss Alps 100 - 100km	100,00	×1
✓ 17	15/7/2023	10th Beaverhead 100K Endurance Run	100,00	×1
✓ 18	30/4/2005	10th Miwok 100k Trail race	100,00	×1
✓ 19	26/3/2005	1st ORRC March Mudness 100 km Ultramararathon	100,00	×1
✓ 20	9/4/2000	17th Mt. Si 50 Miles Ultra Run	90,12	×1
✓ 21	20/5/2006	2nd Watershed Preserve 12 Hr Trail Race	86,50	×1
✓ 22	11/4/1999	16th Mt. Si 50 Miles Ultra Run	83,69	×1
✓ 23	19/4/1998	15th Falls to Gasworks Ultra Run	83,00	×1
✓ 24	27/4/1997	14th Falls to Gasworks Ultra Run	83,00	×1
✓ 25	21/4/1996	13th Falls to Gasworks Ultra Run	83,00	×1
✓ 26	22/6/2024	5th Bears Ears 50mi Ultra Race	80,47	×1
✓ 27	25/7/2015	23rd White River 50 Mile Trail Run	80,47	×1
✓ 28	26/4/2014	11th Capitol Peak 50 Miler	80,47	×1
✓ 29	28/7/2012	20th White River 50 Mile Trail Run	80,47	×1
✓ 30	11/5/2012	1st The Zion 50 Mile Run	80,47	×1
✓ 31	30/7/2011	19th White River 50 Mile Trail Run	80,47	×1
✓ 32	28/4/2007	4th Capitol Peak 50 Miler	80,47	×1
✓ 33	22/4/2007	24th Mt. Si 50 Miles Ultra Run	80,47	×1
✓ 34	18/11/2006	44th JFK 50 Mile	80,47	×1
✓ 35	23/4/2006	23rd Mt. Si 50 Miles Ultra Run	80,47	×1
✓ 36	15/4/2006	3rd Capitol Peak 50 Miler	80,47	×1
✓ 37	30/7/2005	13th White River 50 Mile Trail Run	80,47	×1
✓ 38	5/3/2005	15th Old Pueblo 50 Mile Endurance Run	80,47	×1
✓ 39	31/7/2004	12th White River 50 Mile Trail Run	80,47	×1
✓ 40	27/4/2003	20th Mt. Si 50 Miles Ultra Run	80,47	×1
✓ 41	27/7/2002	10th White River 50 Mile Trail Run	80,47	×1
✓ 42	6/4/2002	23rd American River 50 Mile Endurance Run	80,47	×1
✓ 43	2/3/2002	12th Old Pueblo 50 Mile Endurance Run	80,47	×1
✓ 44	28/7/2001	9th White River 50 Mile Trail Run	80,47	×1
✓ 45	19/5/2001	16th Silver State 50 Miles	80,47	×1
✓ 46	8/4/2001	18th Mt. Si 50 Miles Ultra Run	80,47	×1
✓ 47	17/3/2001	15th Crown King Scramble 50M	80,47	×1
✓ 48	6/5/1999	4th Winterhawk 50 Mile Trail Run	80,47	×1
✓ 49	6/6/1998	3rd Winterhawk 50 Mile Trail Run	80,47	×1
✓ 50	14/9/1996	9th McKenzie River 50 Mile Trail Run	80,47	×1
✓ 51	1/6/1996	2nd Winterhawk 50 Mile Trail Run	80,47	×1
✓ 52	29/7/2000	8th White River 50 Mile Trail Run	76,60	×1
✓ 53	24/7/1999	7th White River 50 Mile Trail Run	76,60	×1
✓ 54	25/7/1998	6th White River 50 Mile Trail Run	76,60	×1
✓ 55	29/7/1995	3rd White River 50 Mile Trail Run	76,60	×1
✓ 56	2/6/2007	4th Blanchard Mountain Trail Ultra 36miles	57,94	—
57	24/5/2025	2nd Leavenworth Trail Fest	55,00	—
58	25/5/2024	1st Leavenworth Trail Fest	55,00	—
59	22/1/2005	3rd Capitol Peak MegaFatAss	54,72	—
60	24/1/2004	2nd Capitol Peak MegaFatAss	54,72	—
61	19/5/2007	3rd Watershed Preserve 12 Hr Trail Race	51,90	—
62	27/8/2005	8th Tamalpa Headlands 50K	50,69	—
63	9/6/2024	3rd Hiawatha Trail Run	50,00	—
64	11/12/2021	19th Pigtails Run 50K	50,00	—
65	20/6/2015	5th Taylor Mountain 50 km Trail Run	50,00	—
66	12/4/2014	5th Squak Mountain 50 km Trail Run	50,00	—
67	28/3/2014	4th Badger Mountain 50 km Challenge	50,00	—
68	21/9/2013	18th Cle Elum Ridge 50k	50,00	—
69	24/2/2013	6th Lord Hill Trail Run	50,00	—
70	12/6/2011	1st Beacon Rock 50K	50,00	—
71	22/1/2011	8th Pigtails Run 50K	50,00	—
72	11/7/2009	5th Grey Rock Trail Run	50,00	—
73	20/6/2009	3rd The 20th Century 50K Trail Run	50,00	—
74	13/9/2008	14th Cle Elum Ridge 50k	50,00	—
75	17/3/2007	15th Chuckanut 50K	50,00	—
76	7/10/2006	5th Baker Lake 50K Ultra Trail Run	50,00	—
77	16/9/2006	12th Cle Elum Ridge 50k	50,00	—
78	17/4/2005	22nd Mt. Si 50 km Ultra Run	50,00	—
79	8/1/2005	10th Bridle Trails Winter Running Festival	50,00	—
80	13/11/2004	11th Ron Herzog 50K	50,00	—
81	13/3/2004	12th Chuckanut 50K	50,00	—
82	21/2/2004	4th Hagg Lake Trail Runs 50K	50,00	—
83	7/2/2004	1st Lord Hill Trail Run	50,00	—
84	10/1/2004	9th Bridle Trails Winter Running Festival	50,00	—
85	22/9/2001	7th Cle Elum Ridge 50k	50,00	—
86	17/2/2001	1st Hagg Lake Trail Runs 50K	50,00	—
87	11/11/2000	9th Ron Herzog 50K	50,00	—
88	18/3/2000	8th Chuckanut 50K	50,00	—
89	15/1/2000	5th Bridle Trails Winter Running Festival	50,00	—
90	13/3/1999	7th Chuckanut 50K	50,00	—
91	14/11/1998	7th Ron Herzog 50K	50,00	—
92	21/3/1998	6th Chuckanut 50K	50,00	—
93	17/1/1998	3rd Bridle Trails Winter Running Festival	50,00	—
94	27/9/1997	3rd Cle Elum Ridge 50k	50,00	—
95	15/3/1997	5th Chuckanut 50K	50,00	—
96	18/1/1997	2nd Bridle Trails Winter Running Festival	50,00	—
97	20/1/1996	1st Bridle Trails Winter Running Festival	50,00	—
98	30/9/1995	1st Cle Elum Ridge 50k	50,00	—