Louise Mason
Born : 1953 Cat. W70 Ultrarunner since 1991 USA
130
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
130
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
2
Countries visited ?CANCanadaUSAUnited States
78,2%
Rank quotient ?This runner's calculation uses 162 eligible race(s): Σ(rank − 1) = 9 368; Σ finishers = 11 980. 9 368 / 11 980 × 100 = 78.20%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed162
Km — ultra races23 401 km
> 100 km136
> 160 km121
> 200 km1
> 24h24
> 48h5
Longest race203,1 km

Km per year (ultra races)

1 197
8 races
2022
1 348
10 races
2023
631
5 races
2024
530
5 races
2025
216
2 races
2026

Race types (share of distance)

Road25,9%
Trail72,9%
?1,2%

Wins & podiums (ultra)

🏆 Win1
🏆 Win F10
🏅 Top 34
🏅 Top 3 F32
Longest winning streak1
Current streak0

HISTORY

164 race(s) · 3 split(s) nested
DateRacePerf.Rk
2026
05.09 24h USA21st Badgerland F/X 24 Hour Run 80.724 km23
20.06 30h USA1st Endless Summer 135.184 km1 🏆
2025
28.12 100mi USA41st Across The Years, 100mi 32:59:15 h42
29.11 24h USA9th Boundiful 24 Hours Endurance Run 122.310 km5
30.08 24h USA20th Badgerland F/X 24 Hour Run 108.759 km11
19.06 48h USA8th Six Days in the Dome - The Redux 48h 57.205 km26
05.04 50mi USA30th Umstead Endurance Run 50 Miles 18:09:02 h124
2024
28.12 100mi USA41th Across The Years, 100mi 30:50:05 h33
29.08 100mi USA1st Front Range Ultra Dayze 100Miles 36:02:29 h9
17.06 12h USA7th Six Days in the Dome - The Redux 12h 66.518 km6
07.06 48h USA13th Merrill's Mile 48 Hour Run 161.749 km20
06.04 50mi USA29th Umstead Endurance Run 50 Miles 14:26:46 h83
2023
31.12 100mi USA39th Across The Years, 100mi 33:25:06 h37
04.11 100mi USA7th Boundiful 100 Mile Endurance Run 32:42:45 h6
07.10 100mi USA4th Hainesport Hundred 100 Mile Endurance Run Summer 29:59:02 h20
02.09 24h USA18th Badgerland F/X 24 Hour Run 114.287 km11
16.06 48h USA6th Six Days in the Dome - The Redux 48h 161.417 km11
03.06 50mi USA3rd Indy Piston 50 Mile Endurance Run AM 15:52:57 h13
06.05 12h USA3rd Island Time 12 Hour Race 61.155 km25
01.04 100mi USA28th Umstead Endurance Run 100 Miles 29:44:10 h123
04.03 100mi USA10th Jackpot Ultra Running Festival 100 Mile Race - US Championship 32:11:32 h30
18.02 24h USA1st The Raven 24 Hour 126.399 km10
2022
28.12 48h USA38th Across the Years, 48h 161.874 km27
05.11 100mi USA6th Boundiful 100 Mile Endurance Run 31:12:02 h7
03.09 48h USA1st GOMU 48 Hour World Championships 161.130 km25
13.08 100mi USA13th Beast of Burden Summer 100 Miler 29:11:42 h18
09.07 24h USA1st SF Half Day 24h 130.678 km7
04.06 100km USA2nd Indy Piston 100 km Endurance Run 18:31:58 h9
02.04 100mi USA27th Umstead Endurance Run 100 Miles 29:04:19 h117
20.02 100mi USA9th Jackpot Ultra Running Festival 100 Mile Race - US Championship 29:07:02 h40
2021
14.08 32h USA8th Hamster Endurance Runs 32 Hour Run 163.187 km8
2020
14.02 100mi USA7th Jackpot Ultra Running Festival 100 Mile Race - US Championship 28:29:30 h20
04.01 100mi USA35th Across The Years, 100mi 31:52:18 h14
2019
02.11 100mi USA4th Boundiful 100 Mile Endurance Run 32:33:24 h12
21.09 32h USA6th Hamster Endurance Runs 32 Hour Run 163.187 km8
10.08 100mi USA10th Beast of Burden Summer 100 Miler 29:25:17 h28
25.05 100mi USA8th Pigtails Challenge 100 Mile 31:51:51 h19
06.04 100mi USA25th Umstead Endurance Run 100 Miles 29:48:10 h152
16.02 100mi USA6th Jackpot Ultra Running Festival 100 Mile Race 27:52:31 h28
2018
01.12 100mi USA1st Fiesta Series 100 Miles 28:24:58 h3 🥉
20.10 75mi USA10th Ghost Train Rail Trail Race 75 Mile 21:50:16 h10
22.09 24h USA12th North Coast 24 Hour Endurance Run 141.683 km40
02.09 24h USA17th Olander Park 24 Hour Run 131.686 km10
04.08 100mi USA9th Beast of Burden Summer 100 Miler 29:33:54 h22
07.07 100mi USA2nd Canal Corridor 100 Mile Endurance Run 27:38:58 h39
26.05 100mi USA7th Pigtails Challenge 100 Mile 30:30:39 h12
08.04 100mi USA24th Umstead Endurance Run 100 Miles 28:53:05 h90
17.02 100mi USA5th Jackpot Ultra Running Festival 100 Mile Race 28:56:45 h25
2017
16.12 100mi USA6th Houston Hundred 100 Mile Ultra 29:52:33 h8
03.09 24h USA16th Olander Park 24 Hour Run 137.792 km8
05.08 100mi USA8th Beast of Burden Summer 100 Miler 28:29:39 h45
08.07 100mi USA1st Canal Corridor 100 Mile Endurance Run 27:18:04 h34
01.04 100mi USA23rd Umstead Endurance Run 100 Miles 29:40:22 h142
2016
17.12 100mi USA5th Houston Hundred 100 Mile Ultra 28:52:39 h3 🥉
13.08 100mi USA7th Beast of Burden Summer 100 Miler 28:59:07 h18
02.04 100mi USA22nd Umstead Endurance Run 100 Miles 28:50:26 h136
2015
12.09 100mi USA1st The Hennepin Hundred - 100 Mile Run 29:54:34 h70
08.08 100mi USA6th Beast of Burden Summer 100 Miler 27:10:05 h26
28.03 100mi USA21st Umstead Endurance Run 100 Miles 28:19:05 h125
2014
15.11 100mi USA1st Tunnel Hill 100 Mile Race 27:27:04 h65
09.08 100mi USA5th Beast of Burden Summer 100 Miler 27:44:57 h24
05.04 100mi USA20th Umstead Endurance Run 100 Miles 28:15:00 h124
2013
12.10 100mi USA14th Heartland 100 Mile Race 29:30:54 h70
17.08 100mi USA4th Beast of Burden Summer 100 Miler 28:39:34 h45
06.04 100mi USA19th Umstead Endurance Run 100 Miles 27:49:48 h133
2012
18.08 100mi USA3rd Beast of Burden Summer 100 Miler 27:35:47 h45
31.03 100mi USA18th Umstead Endurance Run 100 Miles 29:48:51 h148
10.03 100mi USA1st Graveyard 100 Mile Ultramarathon 27:58:00 h37
2011
20.08 100mi USA2nd Beast of Burden Summer 100 Miler 27:55:01 h23
02.04 100mi USA17th Umstead Endurance Run 100 Miles 28:44:40 h130
04.03 126.2mi USA1st Rouge-Orleans 126 Miles Ultramarathon 41:57:53 h16
2010
06.11 100mi USA3rd Mother Road 100 Mile 29:38:05 h124
09.10 100mi USA11th Heartland 100 Mile Race 29:18:06 h54
28.08 100mi USA6th Lean Horse Ultra-Marathon 100 Mile 28:45:00 h82
05.06 24h USA21st FANS 24 Hour Runs 132.400 km31
02.04 100mi USA2nd Philadelphia 100 Endurance Run 31:37:23 h12
27.03 100mi USA16th Umstead Endurance Run 100 Miles 29:27:14 h132
2009
17.10 100mi USA3rd Boulder 100 Mile 28:53:00 h24
05.09 12h USA4th Badgerland F/X 12 Hour Run (day) 74.004 km3 🥉
22.08 100mi USA5th Lean Horse Ultra-Marathon 100 Mile 29:58:00 h72
06.06 24h USA20th FANS 24 Hour Runs 129.101 km30
04.04 50mi USA15th Umstead Endurance Run 50 Miles 13:33:53 h87
2008
11.10 100mi USA9th Heartland 100 Mile Race 28:59:30 h49
30.08 12h USA4th Flatlanders 12 Hour Run 85.440 km8
09.08 8h USA18th Howl at the Moon 8h Run 55.361 km116
19.07 100mi USA7th Tahoe Rim Trail 100M Endurance Runs 34:27:12 h64
05.04 100mi USA14th Umstead Endurance Run 100 Miles 29:21:52 h96
2007
13.10 100mi USA8th Heartland 100 Mile Race 29:37:23 h50
01.09 12h USA3rd Flatlanders 12 Hour Run 74.277 km21
11.08 8h USA17th Howl at the Moon 8h Run 45.576 km156
31.03 100mi USA13th Umstead Endurance Run 100 Miles 28:13:45 h80
03.02 100mi USA15th Rocky Raccoon 100 Mile Trail Run 29:22:13 h159
2006
10.11 100mi USA1st Mother Road 100 Mile 27:07:25 h80
14.10 100mi USA7th Heartland 100 Mile Race 28:56:47 h45
02.09 12h USA2nd Flatlanders 12 Hour Run 89.721 km13
12.08 8h USA16th Howl at the Moon 8h Run 58.242 km93
15.04 100mi USA6th McNaughton 100 Mile Ultra Race 34:28:02 h29
08.04 100mi USA12th Umstead Endurance Run 100 Miles 27:32:33 h68
04.02 100mi USA14th Rocky Raccoon 100 Mile Trail Run 29:17:25 h125
2005
10.12 100mi USA7th Ancient Oaks 100 Mile Run 30:24:00 h14
08.10 100mi USA6th Heartland 100 Mile Race 29:12:18 h39
03.09 6h USA1st Flatlanders 6 Hour Run 50.549 km11
27.08 100mi USA1st Lean Horse Ultra-Marathon 100 Mile 25:33:00 h30
16.04 100mi USA5th McNaughton 100 Mile Ultra Race 33:10:45 h22
02.04 100mi USA11th Umstead Endurance Run 100 Miles 28:52:04 h82
05.02 100mi USA13th Rocky Raccoon 100 Mile Trail Run 31:19:00 h102
2004
11.12 100mi USA6th Ancient Oaks 100 Mile Run 31:25:00 h13
06.11 100mi USA4th Dan Rossi Memorial Ultra 100 Mile 23:58:06 h6
30.10 100mi USA2nd Javelina Jundred 100 Mile 28:32:04 h54
09.10 100mi USA5th Heartland 100 Mile Race 28:32:46 h21
11.09 100mi USA14th Olander Park 24 Hour Run - 100mi Split 26:06:06 h31
11.09 24h USA14th Olander Park 24 Hour Run 160.934 km31
29.05 100mi USA3rd Old Dominion Memorial Day Race 100 Mile 29:05:00 h21
03.04 100mi USA10th Umstead Endurance Run 100 Miles 27:10:43 h75
07.02 100mi USA12th Rocky Raccoon 100 Mile Trail Run 28:49:11 h96
2003
13.12 100mi USA5th Ancient Oaks 100 Mile Run 28:35:00 h6
08.11 100mi USA1st Javelina Jundred 100 Mile 28:29:50 h61
11.10 100mi USA4th Heartland 100 Mile Race 26:47:32 h25
13.09 100mi USA13th Olander Park 24 Hour Run - 100mi Split 24:25:17 h35
13.09 24h USA13th Olander Park 24 Hour Run 160.934 km35
09.08 8h USA13th Howl at the Moon 8h Run 60.656 km63
14.06 100mi USA14th Mohican Trail 100 Mile 29:15:05 h50
03.05 24h USA22nd Cornbelt Running Club 24 Hour Run 157.699 km12
05.04 100mi USA9th Umstead Endurance Run 100 Miles 29:15:29 h72
01.03 24h USA2nd Houston Ultra Event Weekend 24h 147.673 km7
01.02 100mi USA11th Rocky Raccoon 100 Mile Trail Run 28:19:00 h63
2002
07.12 100mi USA4th Ancient Oaks 100 Mile Run 28:36:57 h9
02.11 100mi USA2nd Dan Rossi Memorial Ultra 100 Mile 27:23:30 h8
12.10 100mi USA3rd Heartland 100 Mile Race 27:44:20 h21
20.07 100mi USA14th Vermont 100 Mile Endurance Race 28:47:58 h177
15.06 100mi USA13th Mohican Trail 100 Mile 29:00:09 h52
04.05 24h USA21st Cornbelt Running Club 24 Hour Run 148.365 km9
06.04 100mi USA8th Umstead Endurance Run 100 Miles 28:34:53 h72
02.02 100mi USA10th Rocky Raccoon 100 Mile Trail Run 28:45:49 h84
2001
29.12 50km USA5th Huff 50K Trail Run 7:50:01 h183
05.11 100mi USA1st Dan Rossi Memorial Ultra 100 Mile 25:52:10 h4
13.10 100mi USA2nd Heartland 100 Mile Race 28:28:36 h23
23.06 100mi USA28th Western States 100 Mile Endurance Run 29:50:18 h258
26.05 50mi CAN9th Sulphur Springs Trail Run 50mi 10:53:29 h8
10.05 50mi USA20th Ice Age Trail 50 Mile Run 10:58:25 h216
07.04 100mi USA7th Umstead Endurance Run 100 Miles 26:51:32 h23
03.02 100mi USA9th Rocky Raccoon 100 Mile Trail Run 29:09:54 h93
2000
14.10 100mi USA1st Heartland 100 Mile Race 27:27:27 h17
16.09 100mi USA1st Rio Del Lago 100 Mile 28:56:23 h23
1999
02.10 100mi USA9th Arkansas Traveller 100 28:36:30 h64
1997
19.07 100mi USA9th Vermont 100 Mile Endurance Race 29:22:39 h155
1996
12.10 100mi USA6th Arkansas Traveller 100 28:35:07 h68
20.07 100mi USA8th Vermont 100 Mile Endurance Race 28:02:36 h125
30.03 100mi USA2nd Umstead Endurance Run 100 Miles 28:20:34 h32
1995
07.10 100mi USA5th Arkansas Traveller 100 28:41:47 h75
22.07 100mi USA7th Vermont 100 Mile Endurance Race 27:14:26 h115
13.05 50mi USA14th Ice Age Trail 50 Mile Run 11:35:03 h288
08.04 100mi USA1st Umstead Endurance Run 100 Miles 26:52:07 h10
1994
08.10 100mi USA4th Arkansas Traveller 100 29:23:39 h74
23.07 100mi USA6th Vermont 100 Mile Endurance Race 27:32:16 h105
21.05 50mi USA13th Ice Age Trail 50 Mile Run 11:47:44 h252
02.04 50mi USA15th American River 50 Mile Endurance Run 11:01:25 h385
05.02 100mi USA2nd Rocky Raccoon 100 Mile Trail Run 27:23:00 h30
1993
03.12 100mi USAKey to Shining Key Ultramarathon 100 Mile 26:36:20 h18
09.10 100mi USA3rd Arkansas Traveller 100 29:23:32 h69
31.07 100mi USA5th Vermont 100 Mile Endurance Race 27:15:26 h131
15.05 50mi USA12th Ice Age Trail 50 Mile Run 11:12:03 h256
1991
27.07 50mi USA10th Minnesota Voyageur Trail 50 Mile Ultra 13:20:35 h112
Unknown date
— 100mi USA13th Jackpot Ultra Running Festival 100 Mile Race 32:22:57 h38