Cardiff Half Marathon
Flat, Fast and Friendly Through the Welsh Capital.
Race day
4
Oct 2026
Flat, Fast and Friendly Through the Welsh Capital.
Provenance ledger
Every fact, and where it came from
| Field | Value | Source | Updated |
|---|---|---|---|
| Date | Sunday 4 October 2026Curated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Start time | 10:00 local (Europe/London)Curated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Distances | Half MarathonCurated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Location | Cardiff, Wales, United KingdomCurated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Start area | Cardiff Castle, Castle Street, Cardiff CF10 1BUConfirm the exact start with the organizerCurated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Entry price | £35–£50Curated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Course | Road · Loop · UK Athletics certifiedCurated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Elevation gain | 20 mCurated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Field size | About 25,000 runners (typical field)Curated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Organizer | Run 4 WalesCurated listing · 25 May 2026 | Curated listing | 25 May 2026 |
| Official website | run4wales.orgOrganizer · 25 May 2026 | Organizer | 25 May 2026 |
| Listing | Verified listingSunday Marathon review · 25 May 2026 | Sunday Marathon review | 25 May 2026 |
Source is where this listing’s facts came from. Where a field could not be confirmed we leave it blank rather than guess.
Report a correctionAbout this race
The UK's second largest half marathon on a flat, fast course through Cardiff's iconic landmarks.
Is this race a fit?
These notes are generated from listed Sunday Marathon race facts. They are meant for shortlisting and planning, not as a replacement for official organizer instructions.
Best For
Runners comparing road race options
Cardiff Half Marathon belongs on the shortlist when you are comparing Half Marathon options around Cardiff, Wales, United Kingdom and want the key date, location, registration, and course facts in one place.
Watch For
Confirm entry details before paying
A registration path is listed; review entry rules, refund terms, and transfer policies before paying.
Decision Signal
Performance claims need source checks
Cardiff Half Marathon should be evaluated as a full race-weekend choice in Cardiff, Wales, United Kingdom, not only as a date on a calendar. Start with road surface, loop course, certified course, 20 m elevation gain listed. Weather notes are listed, so factor them into gear and pacing decisions.
- Date And Schedule
Cardiff Half Marathon is currently listed for October 4, 2026, which makes the October planning window important for training and travel. Recheck official timing before race week.
- Location Base
Plan around Cardiff, Wales, United Kingdom, then verify the exact start area, finish area, packet pickup, and post-race exit route before booking non-refundable travel.
- Course Fit
Listed course signals include road surface, loop course, certified course, 20 m elevation gain listed. Use them to compare effort, pacing risk, and training fit before relying on the race for a specific goal.
- Entry Readiness
A registration path is listed; review entry rules, refund terms, and transfer policies before paying.
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