Mark Dahlby
ID 76539
Born : 1963 Cat. M60 Ultrarunner since 2008 USA
45
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
50
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
61,9%
Rank quotient ?This runner's calculation uses 45 eligible race(s): Σ(rank − 1) = 2 221; Σ finishers = 3 586. 2 221 / 3 586 × 100 = 61.94%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed45
Km — ultra races3 108 km
> 100 km4
> 160 km3
> 24h10
Longest race160,9 km
2nd Badger Mountain 100 Mile Challenge — 30/3/2012

Km per year (ultra races)

2022
51
1 race
2023
2024
2025
2026

Race types (share of distance)

Road25,2%
Trail74,8%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 31
🏅 Top 3 M2
Longest winning streak0
Current streak0

Records

50 km4h46'47100 km13h59'1450 mi8h58'21100 mi28h12'3512 h52,80 km24 h67,59 km

HISTORY

45 race(s)
DateRacePerf.Rk
2023
25.03 24h USA21th Pacific Rim One Day 51.499 km59
2021
17.07 50km USA5th Backcountry Rise 50 km Race 10:23:02 h159
2019
20.04 50km USA2nd Run with the Goats 50km - Beer 7:20:00 h6
16.03 24h USA18th Pacific Rim One Day 51.499 km70
2018
12.05 50km USA35th Quicksilver 50 km Endurance Run 6:51:21 h61
17.03 24h USA17th Pacific Rim One Day 56.327 km39
2017
17.03 24h USA16th Pacific Rim One Day 51.499 km42
18.02 60km USA4th Black Canyon Trail 60 km Run 8:19:32 h43
2016
16.10 50km USA7th Fort Steilacoom Trail Run 50 km 4:48:18 h8
18.06 108km USA3rd River of No Return Endurance Run 108K 19:05:09 h32
29.05 50km USA5th Pigtails Challenge 50 km 5:42:18 h6
19.03 24h USA15th Pacific Rim One Day 51.499 km36
09.01 100km USA16th Bandera 100 km Ultratrail 13:59:14 h90
2015
19.12 50km USA13th Pigtails Run 50K 4:46:47 h7
11.04 50mi USA6th Lumberjack Endurance 50 Mile Run 9:55:00 h2 🥈
21.03 24h USA14th Pacific Rim One Day 51.499 km35
2014
26.07 50mi USA22nd White River 50 Mile Trail Run 11:38:22 h150
12.04 50mi USA5th Lumberjack Endurance 50 Mile Run 10:36:00 h4
15.03 24h USA13th Pacific Rim One Day 51.499 km34
2013
09.11 24h USA2nd Croatan 24-Hour Ultramarathon 66.131 km95
05.10 50km USA12th Baker Lake 50K Ultra Trail Run 7:20:19 h117
2012
13.10 50mi USA31st Le Grizz 50 Mile Ultramarathon 10:22:50 h67
30.03 100mi USA2nd Badger Mountain 100 Mile Challenge 28:12:35 h20
2011
16.07 100mi USA10th Tahoe Rim Trail 100M Endurance Run 31:42:22 h42
04.06 50mi USA9th Rainier to Ruston Rail-Trail 50 Mile Ultra 10:03:22 h18
19.03 24h USA10th Pacific Rim One Day 67.592 km49
2010
30.10 50km USA9th ORRC Autumn Leaves 50 km Run 5:37:50 h28
16.10 50km USA1st Defiance 50k 5:53:33 h46
21.08 100km USA9th Where's Waldo 100K Ultramarathon 15:53:34 h78
10.07 50km USA6th Grey Rock Trail Run 7:51:00 h20
05.06 50mi USA8th Rainier to Ruston Rail-Trail 50 Mile Ultra 9:55:51 h19
09.04 50mi USA1st Lumberjack Endurance 50 Mile Run 11:33:00 h16
20.03 24h USA9th Pacific Rim One Day 51.499 km57
20.02 50km USA10th Hagg Lake Trail Runs 50K 6:18:12 h87
16.01 34mi USA8th Capitol Peak MegaFatAss 5:48:00 h25
2009
31.10 12h USA3rd Carkeek 12 Hour 52.802 km19
26.09 100mi USA1st PCT Ultra 100 Miler (Hundred in the Hood) 28:15:06 h72
25.07 50mi USA17th White River 50 Mile Trail Run 12:42:24 h152
11.07 50km USA5th Grey Rock Trail Run 6:31:33 h18
13.06 28.8mi USA3rd Lake Youngs Ultra 4:43:02 h26
16.05 12h USA5th Watershed Preserve 12 Hr Trail Race 51.901 km49
19.04 50mi USA26th Mt. Si 50 Miles Ultra Run 9:11:06 h32
21.03 50km USA17th Chuckanut 50K 6:16:43 h169
2008
15.11 50mi USA8th ORRC Autumn Leaves 50 Mile Run 8:58:21 h14
14.06 28.8mi USA2nd Lake Youngs Ultra 4:51:59 h48