JW🇺🇸

Jim Walmsley

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Arizona, USABorn January 17, 1990Sponsor Hoka One One
UTMB 954ITRA 961Wins 48Podiums 54

A fierce competitor known for his aggressive racing style and record-breaking performances at the 100-mile distance. In 2023, Walmsley made history by becoming the first American man to win UTMB, breaking the course record. A former Air Force Academy cross country captain, he has dominated ultra running with four consecutive Ultra Runner of the Year awards from 2016-2019.

Race Results

2025
5 races5 wins
1st
World Mountain and Trail Running Championships/Long Trail
Sep 27
82km
5,414m+
8:35:11
World Champion
1st
Ultra-Trail du Mont-Blanc/OCC
Aug 28
60km
3,280m+
5:00:35
1st
Meribel Trail/KV de Meribel
Aug 9
3km
1,000m+
0:34:42
1st
Chianti Ultra Trail/Ultra Trail Chianti Castles
Mar 22
120km
5,200m+
9:59:48
1st
Mesquite Canyon Trail Runs/50 Km
Mar 8
49km
1,600m+
3:40:43
2024
3 races1 win
DNF
Ultra-Trail du Mont-Blanc/UTMB
Aug 30
175km
10,040m+
1st
Western States Endurance Run/Western States 100
Jun 29
161km
5,250m+
14:13:45
2nd
Broken Arrow Skyrace/Broken Arrow VK
Jun 21
5km
850m+
0:37:39
2023
5 races5 wins
1st
Nice UTMB/Nice 100K
Sep 30
111km
5,300m+
11:21:05
1st
Kilomètre vertical du Mirantin/KV du Mirantin
Sep 14
3km
900m+
0:35:05
1stCR
Ultra-Trail du Mont-Blanc/UTMB
Sep 1
171km
9,800m+
19:37:43
Course Record
1st
Trail La Frison Roche/La Frison Roche 42km
Aug 5
42km
2,810m+
4:02:48
1st
100 Miles of Istria
Apr 14
169km
6,600m+
17:40:34
2022
2 races2 wins
1st
Festival des Templiers/Grand Trail des Templiers
Oct 23
81km
3,580m+
6:56:16
1st
Kilomètre vertical du Mirantin/KV du Mirantin
Sep 18
3km
900m+
0:34:05
View All 64 Results

Career Highlights

2023: Historic UTMB win - first American man with course record (19:37:43)
2019: Western States 100 course record (14:09:28), breaking previous record by 21 minutes
2019: World best for 50 miles (4:50:07) and World Long Distance Mountain Running Champion
2016-2019: Four consecutive Ultra Runner of the Year awards
2018: Western States 100 course record (14:30:04)
2016: JFK 50 Mile course record (5:21:28)

Key Achievements

World Trail Running Championships Long Trail Winner (2025)
First American man to win UTMB (2023) - Course Record (19:37:43)
Western States 100 Winner (2018, 2019, 2021, 2024) - Course Record (14:09:28)
Ultra Runner of the Year (2016, 2017, 2018, 2019)
World Long Distance Mountain Running Champion (2019)
JFK 50 Mile Winner (2014, 2015, 2016) - Course Record
50 Mile World Best (4:50:07)
Lake Sonoma 50 Winner (2016, 2018) - Course Record
Tarawera Ultramarathon Winner (2017) - Course Record

Notable Traits

Attended United States Air Force Academy, captain of cross country team
Arizona Division 5A-II cross country state champion (2007)
Has set 7 Fastest Known Time records including Grand Canyon Rim-to-Rim-to-Rim
Set 50 mile world best in 2019, breaking 36-year-old record by 14 seconds