In case of any competition changes please keep checking back and the links to organisers websites. Only UK Athletics / Welsh Athletics licenced events are listed.
- 08/03/2026 Llanelli 10km, Half Marathon & Full Marathon
- 14/03/2026 Nant Yr Arian Silver Trail Races 10km & Half Marathon
- 15/03/2026 West Glamorgan Cross Country League Round 5 of 5 @ Tairgwaith
- 21/03/2026 SIAB British Schools U15 & U17 Cross Country International @ Vaynol Park, Pentir, Gwynedd
- 21/03/2026 Spring Equinox 6 Mile Trail Run @ Wentwood Forest, Nr Newport
- 22/03/2026 Merthyr Half Marathon
- 28/03/2026 Welsh Seniors 4 Stage & Masters 3 Stage Road Relay Championships @ Parc Bryn Bach incorporating the trials for the London Mini Marathon U14, U16 & U18
- 29/03/2026 San Domenico 10 & 20 Mile Road Races @ Merthyr Tydfil
- 12/04/2026 Kymin 7 Mile Multi Terrain Race @ Monmouth
- 19/04/2026 Newport 10km Half Marathon & Marathon
- 19/04/2026 Trawsfynydd Multi Terrain 8 Miler
- 26/04/2026 London Marathon
- 10/05/2026 Caerphilly 10km
- 17/05/2026 Barry Island 10km
- 07/06/2026 Swansea Half Marathon
- 05/07/2026 Porthcawl 10km
- 12/07/2026 Mic Morris Torfaen 10km
- 18/07/2026 Rabbit Run 12km & 40km Multi Terrain Races @ Merthyr Mawr
- 26/07/2026 Magor 10km @ Caldicot
- 05/09/2026 Tydfilians 16.5 Mile Roman Run @ Brecon