Jan Grajkowski
ID 201837
Born : 1989 Cat. M35 Ultrarunner since 2008 USA
31
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
40
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 ?USAUnited States
56,4%
Rank quotient ?This runner's calculation uses 31 eligible race(s): Σ(rank − 1) = 3 491; Σ finishers = 6 192. 3 491 / 6 192 × 100 = 56.38%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed31
Km — ultra races2 095 km
> 100 km3
> 160 km3
Longest race160,9 km
44th Leadville Trail 100 Mile — 22/8/2026

Km per year (ultra races)

50
1 race
2022
50
1 race
2023
50
1 race
2024
60
1 race
2025
161
1 race
2026

Race types (share of distance)

Trail100,0%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 31
🏅 Top 3 M1
Longest winning streak0
Current streak0

Records

50 km5h03'47100 km17h28'3450 mi11h09'44100 mi27h59'01

HISTORY

31 race(s)
DateRacePerf.Rk
2026
22.08 100mi USA44th Leadville Trail 100 Mile 27:59:01 h193
2025
25.07 60km USA11th Never Summer 60k 9:37:57 h58
2024
30.11 50km USA3rd Colorado Cold Rush Ultra 8:02:35 h16
2023
22.09 50km USA2nd Red Feather Trail Jamboree - 50k 7:14:33 h46
2022
15.10 50km USA15th Sage Burner Trail Run 6:38:40 h23
2021
23.10 50km USA4th Bobcat Trail Race 50k 6:52:36 h16
2020
19.09 50km USA3rd Sangre de Cristo Ultra 50 km Race 7:27:00 h22
2019
30.11 50km USA3rd Bosque Bigfoot Race 5:42:46 h7
2018
10.11 50km USA9th Rosaryville Veterans Day 50K 6:18:24 h68
2017
09.12 100km USA15th Hellgate 100 km 17:28:34 h104
04.11 50mi USA35th Mountain Masochist 50 Mile Trail Run 11:30:42 h143
06.10 100mi USA9th Grindstone 100 Mile 31:32:23 h120
29.04 50km USA17th Promise Land 50K++ 8:40:09 h238
18.03 50km USA10th Terrapin Mountain 50 km Race 7:16:05 h133
11.02 50km USA22nd Holiday Lake 50K++ 6:22:03 h154
2016
13.02 50km USA21st Holiday Lake 50K++ 7:03:40 h186
2015
14.11 50mi USA6th Stone Mill 50 Mile Run 11:32:01 h166
2014
03.10 100mi USA6th Grindstone 100 Mile 37:38:17 h186
2013
10.08 50mi USA2nd Wildcat Ridge Romp 50 Mile 12:51:00 h2 🥈
27.04 50km USA13th Promise Land 50K++ 7:57:23 h225
23.03 50km USA6th Terrapin Mountain 50 km Race 7:22:15 h203
09.02 50km USA18th Holiday Lake 50K++ 6:43:42 h272
2012
11.02 50km USA17th Holiday Lake 50K++ 5:03:47 h77
2011
04.06 50mi USA4th Endurance Challenge - Washington D.C. Trail 50 Miles 11:28:18 h160
23.04 50km USA11th Promise Land 50K++ 7:05:32 h109
26.03 50km USA4th Terrapin Mountain 50 km Race 6:56:14 h107
12.02 50km USA16th Holiday Lake 50K++ 5:40:30 h132
2010
13.02 50km USA15th Holiday Lake 50K++ 6:21:04 h63
2009
25.04 50km USA9th Promise Land 50K++ 6:48:53 h56
14.02 50km USA14th Holiday Lake 50K++ 5:44:50 h124
2008
01.11 50mi USA26th Mountain Masochist 50 Mile Trail Run 11:09:44 h113