Select the event you're interested in
Register to discover the race
North America
21 - 23 August 2026
10 - 12 September 2026
17 - 20 September 2026
01 - 03 October 2026
08 - 11 October 2026
13 - 15 November 2026
04 - 06 March 2027
08 - 11 April 2027
22 - 25 April 2027
14 - 16 May 2027
04 - 06 June 2027
14 - 16 August 2026
23 - 25 July 2026
27 - 28 June 2026
Europe
24 - 30 August 2026
10 - 13 September 2026
11 - 13 September 2026
18 - 20 September 2026
24 - 27 September 2026
23 - 25 October 2026
30 - 31 October 2026
30 October - 01 November 2026
22 - 24 January 2027
18 - 21 March 2027
01 - 04 April 2027
08 - 10 April 2027
23 - 25 April 2027
30 April - 02 May 2027
13 - 16 May 2027
5th June 2027
10 - 13 June 2027
17 - 19 June 2027
18 - 20 June 2027
23 - 27 June 2027
07 - 11 July 2027
08 - 10 July 2027
09 - 11 July 2027
14 - 18 July 2027
15 - 18 July 2027
06 - 08 August 2026
01 - 02 August 2026
24 - 26 July 2026
Asia
02 - 04 October 2026
16 - 18 October 2026
06 - 08 November 2026
27 November - 06 December 2026
10 - 12 December 2026
08 - 10 January 2027
05 - 07 March 2027
09 - 11 April 2027
18 - 21 June 2026
12 - 14 June 2026
30 April - 03 May 2026
10 - 12 April 2026
14 - 15 March 2026
South America
18 - 22 November 2026
24 - 27 June 2027
30 July - 01 August 2027
20 - 22 March 2026
Oceania
26 - 28 November 2026
13 - 14 February 2027
Africa
27 - 30 May 2027
km
EN
Find a Race
Majors
Finals
Open registration
Sports System
Inclusion & Diversity
Elite Runners
Anti Doping
Health
Age Group Qualification
About UTMB Index
Runner Search
UTMB Index Races
FAQ
News
UTMB Live
Podcasts
Press
UTMB Legends
UTMB For The Planet
UTMB Partners
UTMB Cares
Travel Philosophy
SEAN O BRIEN TRAIL RUNS 2017 - 50 KM
City / Country
United States of America
Date
Race Category
Distance
Elevation Gain
