Mason McWilliams
ID 1004977
Born : 1978 Cat. M45 Ultrarunner since 2017 USA
37
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
46,1%
Rank quotient ?This runner's calculation uses 37 eligible race(s): Σ(rank − 1) = 2 088; Σ finishers = 4 530. 2 088 / 4 530 × 100 = 46.09%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed37
Km — ultra races3 151 km
> 100 km10
> 160 km10
Longest race160,9 km
14th Cruel Jewel 100 Mile — 15/5/2026

Km per year (ultra races)

411
5 races
2022
391
5 races
2023
422
4 races
2024
422
4 races
2025
261
3 races
2026

Race types (share of distance)

Trail98,4%
Ult.Walk1,6%

Wins & podiums (ultra)

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

Records

50 km4h39'49100 km14h27'3150 mi10h38'44100 mi24h44'43

HISTORY

37 race(s)
DateRacePerf.Rk
2026
11.07 50km USA1st Rise in the Pines 6:42:14 h6
15.05 100mi USA14th Cruel Jewel 100 Mile 42:08:29 h114
18.04 50km USA1st Gulf Coast Grind 5:57:47 h2 🥈
2025
26.09 100mi USA27th The Bear 100 Mile Endurance Run 35:26:22 h234
31.05 50km USA2nd Frio Trail Run 50km 10:18:22 h6
05.04 50km USA26th Hells Hills 50km Race 5:58:54 h11
01.02 100mi USA33rd Rocky Raccoon 100 Mile Trail Run 25:36:46 h105
2024
07.12 100mi USA11th Brazos Bend 100 - 100 mi 25:15:43 h52
18.05 100mi USA12th Bryce 100 Mile Trail Run 30:51:01 h28
27.04 50km USA3rd Austin Falls 50 km Ultra 5:57:33 h8
23.03 50km USA11th Behind the Rocks 50km Race 6:56:47 h111
2023
21.10 50km USA6th Big Hill Pond Walking Tall 6:59:40 h29
30.09 50km USA10th Stanky Creek 50 km Trail Race 6:47:04 h11
18.06 100mi USA31st Bighorn Mountain Wild & Scenic 100 Mile Trail Run 33:27:31 h148
15.04 50mi USA33th Ouachita Trail 50 Mile 11:20:43 h13
25.03 50km USA6th Big Buffalo 50 km Endurance Run 5:22:37 h4
2022
12.11 50km USA15th Upchuck 50K Trail Running Race 6:31:56 h41
20.08 100mi USA40th Leadville Trail 100 Mile 28:27:57 h195
16.07 50km USA30th Full Moon Run - Midnight 50K 5:46:39 h11
12.02 99.9km USA9th Black Canyon Trail 100 km Run 14:27:31 h242
15.01 50km USA17th Swamp Stomper 50K 5:33:33 h5
2021
11.12 50km USA8th Bell Ringer 50k Trail Run 5:23:40 h8
13.03 50km USA9th Music City Trail Ultra 6:05:15 h12
2020
07.11 100mi USA13th Pinhoti 100 Mile 27:43:25 h60
19.09 50km USA7th Stanky Creek 50 km Trail Race 5:07:16 h4
01.08 50km USA6th Sheep Mountain 50 km Endurance Run 8:18:00 h28
14.03 50mi USA17th Land Between The Lakes 50 Mile Trail Run 11:03:58 h24
15.02 50km USA28th Sylamore Trail 50k Run 6:07:38 h28
2019
05.10 100mi USA29th Arkansas Traveller 100 24:44:43 h35
13.07 100km USA6th Beaverhead 100K Endurance Run 17:48:51 h90
18.05 50km USA5th Quest for the Crest 50k 13:08:38 h113
16.03 50km USA2nd Big Buffalo 50 km Endurance Run 4:39:49 h6
2018
27.10 100mi USA16th Javelina Jundred 100 Mile Endurance Run 26:15:25 h202
28.04 50mi USA11th Endurance Challenge - Washington D.C. Trail 50 Miles 10:38:44 h83
07.04 50km USA4th Ozarks Foothills 50K 5:26:45 h8
07.01 50km USA18th Bandera 50 km Endurance Run 5:57:03 h42
2017
10.09 50km USA4th Stanky Creek 50 km Trail Race 5:18:37 h6