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Photo: The Big Half

The Big Half: 2027 race guide

London, United Kingdom5 September 2027

Start trainingOfficial entry & details

The Big Half is September 5, 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: not classified in the source material. 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 Big Half is confirmed for September 5, 2027, from Tower Bridge toward Greenwich. The organizer lists four hours for the supported road course, with instructions to move to the pavement if unable to maintain that pace. Follow the current event directions and distinguish the individual half marathon from the relay.

Confirmed race date

The Big Half: September 5, 2027. Verified on October 14, 2026 against the official event information.

Race overview

The Big Half is listed by the organiser for London, England, United Kingdom. The previous edition was listed for 2026-09-06. This page was checked against official event-organizer pages on 2026-07-26. Entry availability can change; use the official event page for the current position.

The official half marathon distance is 21.0975 km on road. The currently published course profile is not classified here; 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.

43 weeks and 5 days remain until the listed 5 September 2027 race day.

  1. Start18 April 2027
  2. Build20 weeks
  3. Taper2 weeks
  4. Race day5 September 2027

20-week plan option

Compare 5 other plan lengths
  • 10-week plan
    Start by 27 June 2027
  • 12-week plan
    Start by 13 June 2027
  • 14-week plan
    Start by 30 May 2027
  • 16-week plan
    Start by 16 May 2027
  • 18-week plan
    Start by 2 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

  • Start conservatively and use effort when terrain, wind, or crowding changes.
  • Rehearse the same pacing cues during key sessions.
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

Your race deserves more than a static plan.

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 September 5, 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 The Big Half in London, England, 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