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Asia
14 - 15 March 2026
10 - 12 April 2026
30 April - 03 May 2026
12 - 14 June 2026
18 - 21 June 2026
11 - 13 September 2026
02 - 04 October 2026
16 - 18 October 2026
06 - 08 November 2026
10 - 12 December 2026
06 - 08 March 2026
29 November - 07 December 2025
14 - 16 November 2025
South America
18 - 22 March 2026
26 - 28 June 2026
31 July - 02 August 2026
17 - 20 September 2026
18 - 22 November 2026
Europe
19 - 22 March 2026
19 - 21 March 2026
09 - 12 April 2026
24 - 26 April 2026
01 - 03 May 2026
14 - 17 May 2026
15 - 17 May 2026
23rd May 2026
11 - 14 June 2026
18 - 20 June 2026
24 - 28 June 2026
01 - 05 July 2026
09 - 11 July 2026
10 - 12 July 2026
15 - 19 July 2026
17 - 19 July 2026
24 - 26 July 2026
01 - 02 August 2026
06 - 08 August 2026
24 - 30 August 2026
10 - 13 September 2026
18 - 20 September 2026
24 - 27 September 2026
30 - 31 October 2026
30 October - 01 November 2026
22 - 25 January 2026
07 - 09 November 2025
North America
16 - 18 April 2026
23 - 25 April 2026
27 - 28 June 2026
23 - 25 July 2026
14 - 16 August 2026
21 - 23 August 2026
10 - 12 September 2026
01 - 03 October 2026
08 - 11 October 2026
13 - 15 November 2026
Oceania
26 - 28 November 2026
13 - 14 February 2027
Africa
29 - 31 May 2026
km
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SEAN O BRIEN TRAIL RUNS 2020 - 100 KM
City / Country
United States of America
Date
Race Category
Distance
Elevation Gain
