UK road ultramarathons · Long road journey
Lon Las Cymru
Holyhead to Cardiff · Wales
A continuous journey through Wales following the Lon Las Cymru cycle route. It belongs among the longer road-based ultras, with a clear caveat that the route is not entirely road.
- Distance / format
- 250 miles · continuous race
- Surface
- Mostly road · cycle-route journey
- Next listed date
- TBC — future edition not confirmed
- Typical field size
- Not confirmed
The course and challenge
The published limit is 88 hours. Sparse support and a long overnight journey distinguish it from a conventional fully supported road race.
Dates and entry
The next date is TBC. The organiser requires a previous 100-mile finish; consult the current qualification and support details before applying.
Next date: TBC. Check the organiser for a new announcement before making plans.
Entry information checked 26 Sept 2026. A published race date does not guarantee available places.