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Cardiff Half Marathon: 2027 race guide

Cardiff, United Kingdom3 October 2027

Start trainingOfficial entry & details

Cardiff Half Marathon is October 3, 2027. Check the organizer date, course-specific preparation and practical race-day planning.

Updated Oct 17, 2026 · Verified Oct 14, 2026

The race at a glance

Route and elevation

Official race distance: 21.0975 km on road. Official course profile: flat. Use the current organizer map and athlete guide for final elevation, aid-station, turn and cutoff details.

Race guide

Next edition and entry check

The organizer confirms October 3, 2027. Its announcement says the free ballot closes October 18, 2026, with results October 22; applying does not secure entry. Some FAQs retain 2026 collection and transfer dates, so wait for the 2027 operational updates.

Confirmed race date

Cardiff Half Marathon: October 3, 2027. Verified on October 14, 2026 against the official event information.

Race overview

Cardiff Half Marathon is listed by the organiser for Cardiff, Wales, United Kingdom. The previous edition was listed for 2026-10-04. This page was checked against official event-organizer pages on 2026-07-26. For that previous edition, the organiser labelled entry status as sold out.

The official half marathon distance is 21.0975 km on road. The currently published course profile is flat; use the latest organiser map for turns, aid stations, elevation and cutoff details.

The organiser remains the reference for entry eligibility, exact start time, division or age-group rules, equipment, course changes, cutoffs and cancellation policies. Recheck the official event page before paying for travel and again when the current athlete guide is released.

Final official-source checklist

Within race week, reopen the official event page and confirm date, venue, start procedure, entry status, course, rules, equipment, cutoffs and emergency guidance. Keep the current athlete guide available offline if the organiser provides one.

Further reading

Training plan and timing

Compare the start dates below, then choose a plan that fits your current training and available time.

47 weeks and 5 days remain until the listed 3 October 2027 race day.

  1. Start16 May 2027
  2. Build20 weeks
  3. Taper2 weeks
  4. Race day3 October 2027

20-week plan option

Compare 5 other plan lengths
  • 10-week plan
    Start by 25 July 2027
  • 12-week plan
    Start by 11 July 2027
  • 14-week plan
    Start by 27 June 2027
  • 16-week plan
    Start by 13 June 2027
  • 18-week plan
    Start by 30 May 2027
View 20-week plansView 10-week plansView 12-week plansView 14-week plansView 16-week plansView 18-week plans

Need a printable plan? Download the Half marathon training plan PDF.

Race-day strategy

  • Use restraint early; a fast-looking course makes an aggressive opening easy to justify.
  • Settle into rhythm before making any pace adjustment.
Open race calculators and tools
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Running pace calculatorRace time predictorTraining start-date calculatorHalf marathon training plan PDF

Race-week logistics

Use the current organiser guide for schedules, transport, cutoffs, equipment, and other time-sensitive instructions.

Current details to confirm: start schedule, expo, bib pickup, transport, cutoffs, equipment rules, entry price.

Adaptive AI coach for iPhone

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Your adaptive AI coach builds around this finish line, follows the training you complete, and adjusts upcoming work around recovery, travel, missed sessions, and race week.

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FAQs

When is this race?

The organizer lists October 3, 2027 for this event. Recheck the final participant guide for the represented distance’s start and travel details.

Where is this race?

The official event page lists Cardiff Half Marathon in Cardiff, Wales, United Kingdom. Confirm the venue address and access instructions on the current event page.

How long should I train for this race?

Compare the 10, 12, 14, 16, 18, 20 week plans with your current consistency, event-specific demands, recovery and available runway. Do not compress missed weeks if a standard start date has passed.

What should I verify before entering this race?

Check the current date, entry status, eligibility, course or venue layout, equipment, cutoffs, cancellation terms and travel demands on the official organiser page.

Is the course information for this race final?

No. The distance and current high-level course signals come from official organizer material. Use the latest map or GPX, athlete guide, elevation profile, aid plan and cutoff table for final decisions.

Can a calculator predict my race result?

No. Calculators organize assumptions. Weather, terrain, venue flow, transitions, nutrition, health, crowding and late-race fatigue can change the result.

Keep going

Half Marathon Race Calendar and Athlete Guides

Browse 29 official-source half-marathon events by date and place, with race guides, course details, entry information and training tools.

Open guide

Half Marathon Training Plans: 10–20 Weeks

Choose a 10–20 week half marathon plan using running consistency, long-run readiness, recovery, schedule and race-date checks.

Open guide

Strength training for running economy: what to do (without ruining your runs)

Evidence-informed protocol: Strength training for running economy: what to do (without ruining your runs). Practical steps, who it helps, and what to watch out for.

Open guide

Sources