Justin Grigg
ID 558967
Born : 1974 Cat. M50 Ultrarunner since 2013 USA
26
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
42
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
3
Countries visited ?CANCanadaNZLNew ZealandUSAUnited States
26,9%
Rank quotient ?This runner's calculation uses 26 eligible race(s): Σ(rank − 1) = 1 143; Σ finishers = 4 247. 1 143 / 4 247 × 100 = 26.91%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed26
Km — ultra races2 335 km
> 100 km7
> 160 km6
Longest race193,1 km
14th Fat Dog 120 Mile Trail Race — 11/8/2023

Km per year (ultra races)

375
4 races
2022
245
2 races
2023
263
2 races
2024
161
1 race
2025
161
1 race
2026

Race types (share of distance)

Trail100,0%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 32
🏅 Top 3 M3
Longest winning streak0
Current streak0

Records

50 km4h39'51100 km11h21'1850 mi9h40'39100 mi24h52'2312 h64,37 km

HISTORY

26 race(s)
DateRacePerf.Rk
2026
04.09 100mi USA6th Dark Divide 100 Mile Race 29:52:12 h16
2025
08.08 100mi USA5th Wyoming Range 100 Mile Endurance Run 33:04:58 h8
2024
21.09 100mi USA7th Teanaway Country 100 Race 27:02:00 h3 🥉
17.02 102km NZL15th Tarawera 100 km Ultramarathon 13:23:03 h86
2023
11.08 120mi CAN14th Fat Dog 120 Mile Trail Race 33:38:55 h7
11.02 12h USA3rd Running Up For Air - Mt. Sentinel 51.499 km10
2022
23.09 100mi USA24th The Bear 100 Mile Endurance Run 24:52:23 h28
04.09 50km USA10th The Rut Mountain Runs 8:07:53 h84
16.07 100km USA5th Wy'east Howl 100km Race 11:21:18 h6
12.02 12h USA2nd Running Up For Air - Mt. Sentinel 64.373 km4
2021
11.09 100mi USA10th Idaho Mountain Trail Ultra Festival (IMTUF 100) 28:46:02 h29
23.05 50km USA2nd The Hootenanny 50km Trail Race 4:39:51 h8
27.03 50mi USA8th Behind the Rocks 50 Mile Race 9:40:39 h13
2020
04.10 50km USA1st The Hootenanny 50km Trail Race 5:16:39 h3 🥉
2019
23.03 50mi USA6th Behind the Rocks 50 Mile Race 10:17:55 h20
2018
07.10 100km USA1st The Hootenanny 100km Trail Race 13:01:49 h13
02.09 50km USA6th The Rut Mountain Runs 8:49:41 h159
02.06 50mi USA5th Scout Mountain 50 Miles Ultra Trail 11:11:46 h18
17.02 55km USA12th Moab Red Hot 55k 5:50:13 h54
2016
03.09 50km USA4th The Rut Mountain Runs 6:23:46 h180
09.07 55km USA3rd Beaverhead 55K Endurance Run 7:49:39 h16
2015
05.09 50km USA3rd The Rut Mountain Runs 9:17:53 h176
19.06 52mi USA23rd Bighorn Mountain Wild & Scenic 50mi Trail Run 11:36:31 h42
2014
13.09 50km USA2nd The Rut Mountain Runs 9:00:01 h138
20.06 50mi USABighorn Mountain Wild & Scenic 50mi Trail Run 11:33:42 h39
2013
22.06 33.5mi USA1st Trail Rail Run 50 km 5:16:11 h9