John Maack

Born : 1961 Cat. M65 Ultrarunner since 2006

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 ?

United States

47,5%

Rank quotient ?This runner's calculation uses 75 eligible race(s): Σ(rank − 1) = 5 419; Σ finishers = 11 397. 5 419 / 11 397 × 100 = 47.55%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed75

Km — ultra races5 796 km

> 100 km11

> 160 km11

Longest race160,9 km

20th The Bear 100 Mile Endurance Run — 28/9/2018

Km per year (ultra races)

351

2022

150

2023

2024

170

2025

2026

Race types (share of distance)

Road2,6%

Trail97,4%

Wins & podiums (ultra)

🏆 Win1

🏆 Win M2

🏅 Top 32

🏅 Top 3 M2

Longest winning streak1

Current streak0

Records

50 km4h56'27 100 km16h07'51 50 mi9h18'33 100 mi28h50'08 12 h77,25 km

HISTORY

75 race(s)

Date		Race	Perf.	Rk
2025
18.10	50km	14th Antelope Island Fall Classic 50K	7:08:29 h	66
16.08	50km	3rd Mid Mountain 50K	7:42:51 h	183
26.07	70km	11th Tushars 70km Mountain Runs	17:47:04 h	70
2024
08.06	50mi	28th Snow Peaks 50 Mile Trail Run	17:06:52 h	115
2023
29.07	70km	9th Tushars 70km Mountain Runs	17:17:13 h	76
24.06	50mi	4th Bears Ears 50mi Ultra Race	14:46:02 h	36
2022
04.11	50km	11th Antelope Island Fall Classic 50K	6:41:35 h	82
14.10	12h	2nd Ultimate Unicorn 12 Hour Challenge	70.811 km	1 🏆
13.08	50km	4th Elephant Rock 50km Trail Run	9:20:00 h	10
23.07	50km	15th Speedgoat 50k	10:46:44 h	247
11.06	50mi	26th Snow Peaks 50 Mile Trail Run	13:59:23 h	109
25.03	50km	17th Antelope Island Buffalo Run 50 km	6:06:26 h	15
2021
05.11	50km	10th Antelope Island Fall Classic 50K	5:24:48 h	37
22.10	12h	1st Ultimate Unicorn 12 Hour Challenge	77.248 km	2 🥈
24.07	50km	14th Speedgoat 50k	12:35:54 h	223
05.06	50mi	8th Scout Mountain 50 Miles Ultra Trail	15:17:05 h	47
2019
16.11	50km	9th Antelope Island Fall Classic 50K	5:16:53 h	46
2018
28.09	100mi	20th The Bear 100 Mile Endurance Run	30:40:45 h	112
07.09	100mi	39th Wasatch Front 100 Mile	31:24:56 h	81
04.08	100km	4th Tushars 100km Mountain Runs	20:50:18 h	13
21.07	50km	11th Speedgoat 50k	9:14:33 h	107
30.06	64km	1st Twisted Fork Run	8:07:19 h	27
02.06	50mi	22nd Snow Peaks 50 Mile Trail Run	11:28:31 h	63
24.03	50km	13th Antelope Island Buffalo Run 50 km	5:17:06 h	19
2017
11.11	50km	7th Antelope Island Fall Classic 50K	5:15:02 h	27
08.09	100mi	38th Wasatch Front 100 Mile	28:50:08 h	53
19.08	55km	3rd Skyline Mountain Marathon 55K	6:48:39 h	6
29.07	50km	10th Speedgoat 50k	8:51:01 h	71
24.06	28mi	10th Logan Peak 28 Mile Trail Race	5:41:31 h	31
2016
05.11	50km	6th Antelope Island Fall Classic 50K	4:56:27 h	23
09.09	100mi	37th Wasatch Front 100 Mile	30:56:37 h	102
06.08	93km	2nd Tushars 93km Mountain Runs	17:00:27 h	11
09.07	50km	9th Speedgoat 50k	8:57:27 h	93
25.06	28mi	9th Logan Peak 28 Mile Trail Race	5:37:31 h	40
04.06	50mi	20th Snow Peaks 50 Mile Trail Run	12:06:17 h	69
19.03	50km	11th Antelope Island Buffalo Run 50 km	5:25:52 h	27
2015
14.11	50km	5th Antelope Island Fall Classic 50K	5:06:42 h	34
01.08	93km	1st Tushars 93km Mountain Runs	18:58:12 h	43
25.07	50km	8th Speedgoat 50k	9:44:12 h	165
27.06	28mi	8th Logan Peak 28 Mile Trail Race	6:04:33 h	45
06.06	50mi	3rd Bryce 50 Mile Trail Run	11:14:13 h	40
21.03	50mi	10th Antelope Island Buffalo Run 50 Mile	9:18:33 h	45
2014
05.09	100mi	35th Wasatch Front 100 Mile	29:22:43 h	110
02.08	100km	13th Katcina Mosa 100K Mountain Run	16:07:51 h	14
19.07	50km	7th Speedgoat 50k	10:56:38 h	232
07.06	50mi	18th Snow Peaks 50 Mile Trail Run	12:54:28 h	106
22.03	50mi	9th Antelope Island Buffalo Run 50 Mile	9:40:59 h	46
2013
19.10	50km	3rd Antelope Island 50K	5:05:09 h	28
06.09	100mi	34th Wasatch Front 100 Mile	34:25:35 h	154
24.08	50km	3rd Sapper Joe Trail Race	6:55:33 h	38
10.08	100km	12th Katcina Mosa 100K Mountain Run	18:24:52 h	31
27.07	50km	6th Speedgoat 50k	11:10:11 h	255
23.03	50km	8th Antelope Island Buffalo Run 50 km	5:57:03 h	65
2012
24.03	50km	7th Antelope Island Buffalo Run 50 km	5:16:44 h	27
18.02	55km	6th Moab Red Hot 55k	5:54:28 h	70
2011
09.09	100mi	32nd Wasatch Front 100 Mile	32:24:39 h	109
30.07	50km	4th Speedgoat 50k	9:08:32 h	99
04.06	50mi	15th Snow Peaks 50 Mile Trail Run	15:21:41 h	140
26.03	50km	6th Antelope Island Buffalo Run 50 km	5:24:25 h	38
2010
10.09	100mi	31st Wasatch Front 100 Mile	31:28:28 h	93
31.07	50km	3rd Speedgoat 50k	9:42:35 h	111
05.06	50mi	14th Snow Peaks 50 Mile Trail Run	13:38:15 h	111
27.03	50km	5th Antelope Island Buffalo Run 50 km	5:30:38 h	36
2009
18.07	50km	2nd Speedgoat 50k	10:04:00 h	59
06.06	50mi	13th Snow Peaks 50 Mile Trail Run	12:14:18 h	92
28.03	50mi	4th Antelope Island Buffalo Run 50 Mile	9:23:19 h	42
21.03	50km	1st Sapper Joe Trail Race	5:50:57 h	19
2008
06.09	100mi	29th Wasatch Front 100 Mile	30:52:01 h	62
26.07	50km	1st Speedgoat 50k	9:04:51 h	48
18.07	50km	6th MillCreek 50k	9:09:00 h	18
07.06	50mi	12th Snow Peaks 50 Mile Trail Run	14:10:57 h	114
16.02	55km	2nd Moab Red Hot 55k	9:15:46 h	154
2007
08.09	100mi	28th Wasatch Front 100 Mile	32:30:17 h	88
02.06	50mi	11th Snow Peaks 50 Mile Trail Run	12:24:25 h	66
2006
09.09	100mi	27th Wasatch Front 100 Mile	33:49:58 h	107

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	28/9/2018	20th The Bear 100 Mile Endurance Run	160,93	×3
✓ 2	7/9/2018	39th Wasatch Front 100 Mile	160,93	×3
✓ 3	8/9/2017	38th Wasatch Front 100 Mile	160,93	×3
✓ 4	9/9/2016	37th Wasatch Front 100 Mile	160,93	×3
✓ 5	5/9/2014	35th Wasatch Front 100 Mile	160,93	×3
✓ 6	6/9/2013	34th Wasatch Front 100 Mile	160,93	×3
✓ 7	9/9/2011	32nd Wasatch Front 100 Mile	160,93	×3
✓ 8	10/9/2010	31st Wasatch Front 100 Mile	160,93	×3
✓ 9	6/9/2008	29th Wasatch Front 100 Mile	160,93	×3
✓ 10	8/9/2007	28th Wasatch Front 100 Mile	160,93	×3
✓ 11	9/9/2006	27th Wasatch Front 100 Mile	160,93	×3
✓ 12	4/8/2018	4th Tushars 100km Mountain Runs	100,00	×1
✓ 13	2/8/2014	13th Katcina Mosa 100K Mountain Run	100,00	×1
✓ 14	10/8/2013	12th Katcina Mosa 100K Mountain Run	100,00	×1
✓ 15	6/8/2016	2nd Tushars 93km Mountain Runs	93,00	×1
✓ 16	1/8/2015	1st Tushars 93km Mountain Runs	93,00	×1
✓ 17	8/6/2024	28th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 18	24/6/2023	4th Bears Ears 50mi Ultra Race	80,47	×1
✓ 19	11/6/2022	26th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 20	5/6/2021	8th Scout Mountain 50 Miles Ultra Trail	80,47	×1
✓ 21	2/6/2018	22nd Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 22	4/6/2016	20th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 23	6/6/2015	3rd Bryce 50 Mile Trail Run	80,47	×1
✓ 24	21/3/2015	10th Antelope Island Buffalo Run 50 Mile	80,47	×1
✓ 25	7/6/2014	18th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 26	22/3/2014	9th Antelope Island Buffalo Run 50 Mile	80,47	×1
✓ 27	4/6/2011	15th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 28	5/6/2010	14th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 29	6/6/2009	13th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 30	28/3/2009	4th Antelope Island Buffalo Run 50 Mile	80,47	×1
✓ 31	7/6/2008	12th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 32	2/6/2007	11th Snow Peaks 50 Mile Trail Run	80,47	×1
✓ 33	22/10/2021	1st Ultimate Unicorn 12 Hour Challenge	77,25	×1
✓ 34	14/10/2022	2nd Ultimate Unicorn 12 Hour Challenge	70,81	×1
✓ 35	26/7/2025	11th Tushars 70km Mountain Runs	70,00	×1
✓ 36	29/7/2023	9th Tushars 70km Mountain Runs	70,00	×1
✓ 37	30/6/2018	1st Twisted Fork Run	64,00	×1
✓ 38	19/8/2017	3rd Skyline Mountain Marathon 55K	55,00	×1
✓ 39	18/2/2012	6th Moab Red Hot 55k	55,00	×1
✓ 40	16/2/2008	2nd Moab Red Hot 55k	55,00	×1
✓ 41	18/10/2025	14th Antelope Island Fall Classic 50K	50,00	—
✓ 42	16/8/2025	3rd Mid Mountain 50K	50,00	—
✓ 43	4/11/2022	11th Antelope Island Fall Classic 50K	50,00	—
✓ 44	13/8/2022	4th Elephant Rock 50km Trail Run	50,00	—
✓ 45	23/7/2022	15th Speedgoat 50k	50,00	—
✓ 46	25/3/2022	17th Antelope Island Buffalo Run 50 km	50,00	—
✓ 47	5/11/2021	10th Antelope Island Fall Classic 50K	50,00	—
✓ 48	24/7/2021	14th Speedgoat 50k	50,00	—
✓ 49	16/11/2019	9th Antelope Island Fall Classic 50K	50,00	—
✓ 50	21/7/2018	11th Speedgoat 50k	50,00	—
51	24/3/2018	13th Antelope Island Buffalo Run 50 km	50,00	—
52	11/11/2017	7th Antelope Island Fall Classic 50K	50,00	—
53	29/7/2017	10th Speedgoat 50k	50,00	—
54	5/11/2016	6th Antelope Island Fall Classic 50K	50,00	—
55	9/7/2016	9th Speedgoat 50k	50,00	—
56	19/3/2016	11th Antelope Island Buffalo Run 50 km	50,00	—
57	14/11/2015	5th Antelope Island Fall Classic 50K	50,00	—
58	25/7/2015	8th Speedgoat 50k	50,00	—
59	19/7/2014	7th Speedgoat 50k	50,00	—
60	19/10/2013	3rd Antelope Island 50K	50,00	—
61	24/8/2013	3rd Sapper Joe Trail Race	50,00	—
62	27/7/2013	6th Speedgoat 50k	50,00	—
63	23/3/2013	8th Antelope Island Buffalo Run 50 km	50,00	—
64	24/3/2012	7th Antelope Island Buffalo Run 50 km	50,00	—
65	30/7/2011	4th Speedgoat 50k	50,00	—
66	26/3/2011	6th Antelope Island Buffalo Run 50 km	50,00	—
67	31/7/2010	3rd Speedgoat 50k	50,00	—
68	27/3/2010	5th Antelope Island Buffalo Run 50 km	50,00	—
69	18/7/2009	2nd Speedgoat 50k	50,00	—
70	21/3/2009	1st Sapper Joe Trail Race	50,00	—
71	26/7/2008	1st Speedgoat 50k	50,00	—
72	18/7/2008	6th MillCreek 50k	50,00	—
73	24/6/2017	10th Logan Peak 28 Mile Trail Race	45,06	—
74	25/6/2016	9th Logan Peak 28 Mile Trail Race	45,06	—
75	27/6/2015	8th Logan Peak 28 Mile Trail Race	45,06	—