Caernarfon Half Marathon
The Lowdown
The Caernarfon Half Marathon is a North Wales Championship road race that starts and finishes beside the medieval walls of Caernarfon Castle in Gwynedd, Wales. Organized by Run Wales, the two-lap course is mainly flat with a few short rises and long fast downhill sections, tracing the town center, the Menai Strait coastline, country roads, and cycle paths. Drink stations appear roughly every 3 miles, and every finisher receives a bespoke medal and technical t-shirt. Entry is open to runners aged 17 and over, with a 15-minutes-per-mile pace requirement enforced after the third mile. The race draws local and regional club runners each September, making it a scenic, community-rooted half marathon in the shadow of a UNESCO World Heritage castle.
Race Day
Weather Forecast
Elevation
Terrain Profile
Relatively flat course
Participants
Field Size
Intimate field
Crowd Rating
Spectator Support
Good crowd energy
Caernarfon Castle (start/finish)
Menai Strait coastline
Caernarfon town centre
Caernarfon, Gwynedd, United Kingdom
GB
Average rate for 3-star accommodations near the start line
Eligibility
- Runners must be at least 17 years old on race day
- Runners must maintain roughly a 15-minutes-per-mile pace after mile 3 or may be transitioned off the course
Required Documents
- Race bib/timing chip
Entry Methods
- Online entry via Run Wales
- Free entry available through the St David's Hospice charity partnership with a minimum sponsorship commitment
Cancellation & Refund Policy
Entries are generally non-refundable per standard Run Wales terms; confirm deferral options on the official entry page
Designated a North Wales Championship road race
Organized by Run Wales
Two-lap route combining town centre, coastline, country roads, and cycle paths
Held annually each September; the 2025 edition ran 7 September 2025
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