Marathons in Wales 2026-2027
6 marathons and 4 half marathons coming up in Wales, by date. Rated races show how many minutes the course adds or saves against an average road race, from its climbing, surface and typical race-day weather.
Flattest half marathons in Wales
Rated road races, least total climbing first.
- 1.Swansea Half MarathonSwansea, 36m climbing, -3 min vs average, June 2027
- 2.Cardiff Half MarathonCardiff, 68m climbing, -2 min vs average, Oct 2027
- 3.Conwy Half MarathonConwy, 292m climbing, +4 min vs average, Nov 2026
Marathons in Wales (6)
Apr 2027
Oct 2027
- 24 Oct 2027 Eryri Marathon, Llanberis, Wales
Half marathons in Wales (4)
Marathons in Wales at a glance
- Busiest month: Apr 2027, with 2 races.
- A typical marathon here climbs about 401m in total (the median of 5 rated courses), against about 344m across the UK.
- A typical half marathon here climbs about 292m in total (the median of 4 rated courses), against about 136m across the UK.
- Hilliest: Dyfi X Trail Marathon, with 1239m of climbing (trail).
- Coolest race day on average: Great Welsh Marathon (Mar 2027, a typical high of 10°C). Warmest: Black Mountains Marathon (June 2027, 19°C).
Marathons in other nations
- Scotland (12)
- Wales (10)