Jack Rosenfeld (M46)
2026
2 Races | 131 mi.Born to Run Ultra Marathons
May 13th 2026
| Los Olivos, CA
Duration
96 Hours
Overall
31
/ 101
Division (M)
29
/ 62
100
Bridle Trails Winter Trail Running Festi...
Jan 10th 2026
| Bellevue, WA
Distance
50 KM
Overall
40
/ 44
Division (M)
30
/ 33
7:02:48
2025
2 Races | 251 mi.Hamster Endurance Runs
Aug 2nd 2025
| Bellingham, WA
Duration
32 Hours
Overall
9
/ 33
Division (M)
6
/ 16
101.4
Born to Run Ultra Marathons
May 14th 2025
| Los Olivos, CA
Duration
96 Hours
Overall
10
/ 96
Division (M)
8
/ 60
150
2024
3 Races | 124 mi.Fall Deception Pass
Dec 14th 2024
| Oak Harbor, WA
Distance
50 KM
Overall
170
/ 212
Division (M)
101
/ 118
7:10:52
Cougar Mountain Trail Run Series
Oct 27th 2024
| Bellevue, WA
Distance
50 KM
Overall
22
/ 39
Division (M)
18
/ 26
7:41:04
The Yeti 100 Mile Endurance Run-Washingt...
Jun 28th 2024
| North Bend, WA
Distance
100 KM
Overall
36
/ 48
Division (M)
24
/ 30
17:40:37
2023
3 Races | 361 mi.The Golden 6 Hour
Oct 14th 2023
| Liberty, WA
Duration
6 Hours
Overall
56
/ 13
Division (F)
43
/ 67
20.8
Cowboy 200
Sep 15th 2023
| Norfolk, NE
Distance
200 Miles
Overall
28
/ 31
Division (M)
22
/ 24
81:58:41
Born to Run Ultra Marathons
Apr 12th 2023
| Los Olivos, CA
Duration
96 Hours
Overall
17
/ 61
Division (M)
13
/ 38
140
2022
1 Race | 31 mi.Teanaway Country 100M/50M/50K
Sep 17th 2022
| Cle Elum, WA
Distance
50 KM
Overall
57
/ 62
Division (M)
36
/ 39
14:05:00
2018
2 Races | 67 mi.Born to Run Ultra Marathons
May 19th 2018
| Los Olivos, CA
Distance
30 Miles
Overall
65
/ 173
Division (M)
42
/ 98
5:47:46
Cottontail 6 & 12 Hour
Apr 14th 2018
| Seattle, WA
Duration
12 Hours
Overall
8
/ 10
Division (M)
6
/ 8
36.67
2017
3 Races | 111 mi.West Seattle Beach Run - Summer
Jul 23rd 2017
| Seattle, WA
Distance
50 KM
Overall
6
/ 11
Division (M)
4
/ 6
5:57:50
Rainier to Ruston
Jun 3rd 2017
| Tacoma, WA
Distance
50 Miles
Overall
36
/ 47
Division (M)
27
/ 34
11:44:36
Born to Run Ultra Marathons
May 20th 2017
| Los Olivos, CA
Distance
30 Miles
Overall
126
/ 160
Division (M)
66
/ 78
10:25:26
2016
1 Race | 41 mi.Cottontail 6 & 12 Hour
Mar 26th 2016
| Seattle, WA
Duration
12 Hours
Overall
4
/ 9
Division (M)
2
/ 5
41.07
2015
4 Races | 142 mi.Over The Hill Track Club High Desert 50K
Dec 6th 2015
| Ridgecrest, CA
Distance
50 KM
Overall
123
/ 214
Division (M)
89
/ 135
6:25:18
Born to Run Ultra Marathons
May 16th 2015
| Los Olivos, CA
Distance
30 Miles
Overall
52
/ 246
Division (M)
41
/ 140
5:07:56
Antelope Canyon Ultras
Feb 21st 2015
| Page, AZ
Distance
50 Miles
Overall
56
/ 123
Division (M)
43
/ 72
11:35:32
Sean O'Brien 100k/50M/50k
Feb 7th 2015
| Malibu, CA
Distance
50 KM
Overall
103
/ 198
Division (M)
71
/ 114
7:20:28
2014
5 Races | 281 mi.Across the Years
Dec 28th 2014
| Peoria, AZ
Duration
48 Hours
Overall
15
/ 71
Division (M)
9
/ 43
107.08
Whoos in El Moro - Fall
Oct 12th 2014
| Newport Beach, CA
Distance
50 KM
Overall
52
/ 90
Division (M)
35
/ 48
6:31:33
Headlands
Sep 13th 2014
| Sausalito, CA
Distance
50 Miles
Overall
50
/ 69
Division (M)
42
/ 53
13:31:29
Bulldog 50K Ultra Run & 25K Trail Run
Aug 23rd 2014
| Calabasas, CA
Distance
50 KM
Overall
37
/ 175
Division (M)
31
/ 128
5:17:41
Born to Run Ultra Marathons
May 17th 2014
| Los Olivos, CA
Distance
100 KM
Overall
32
/ 37
Division (M)
22
/ 24
17:20:15
2013
2 Races | 81 mi.Bulldog 50K Ultra Run & 25K Trail Run
Aug 24th 2013
| Calabasas, CA
Distance
50 KM
Overall
67
/ 175
Division (M)
51
/ 124
5:51:59
Avalon Benefit 50
Jan 12th 2013
| Avalon, CA
Distance
50 Miles
Overall
26
/ 273
Division (M)
20
/ 179
8:19:05
2012
3 Races | 162 mi.JFK
Nov 17th 2012
| Boonsboro, MD
Distance
50 Miles
Overall
505
/ 946
Division (M)
405
/ 699
10:26:04
Born to Run Ultra Marathons
May 19th 2012
| Los Olivos, CA
Distance
100 KM
Overall
8
/ 21
Division (M)
6
/ 11
13:54:00
American River
Apr 7th 2012
| Folsom, CA
Distance
50 Miles
Overall
77
/ 689
Division (M)
71
/ 485
8:13:21
2011
3 Races | 112 mi.The North Face Endurance Challenge Calif...
Dec 3rd 2011
| Marin, CA
Distance
50 Miles
Overall
130
/ 319
Division (M)
109
/ 255
10:02:50
Santa Monica Mountains
Nov 20th 2011
| Malibu, CA
Distance
50 KM
Overall
16
/ 69
Division (M)
13
/ 53
5:46:30
Bulldog 50K Ultra Run & 25K Trail Run
Aug 27th 2011
| Calabasas, CA
Distance
50 KM
Overall
26
/ 162
Division (M)
20
/ 112
6:01:18
2010
1 Race | 40 mi.Santa Barbara Red Rock
Nov 27th 2010
| Santa Barbara, CA
Distance
40 Miles
Overall
43
/ 78
Division (M)
36
/ 62
10:36:00
35
Races
15y 5m 21d
Longevity
1,936
Lifetime Miles
Personal Bests
50k
(12)
5:17:41
2014
50m
(7)
8:13:21
2012
100k
(3)
13:54:00
2012
12hr
(2)
41.07
2016
6hr
(1)
20.8
2023
Distance by Year
2026
131
Miles
2 Races
2025
251
Miles
2 Races
2024
124
Miles
3 Races
2023
361
Miles
3 Races
2022
31
Miles
1 Race
2018
67
Miles
2 Races
2017
111
Miles
3 Races
2016
41
Miles
1 Race
2015
142
Miles
4 Races
2014
281
Miles
5 Races
2013
81
Miles
2 Races
2012
162
Miles
3 Races
2011
112
Miles
3 Races
2010
40
Miles
1 Race