Sunday, October 4, 2026 - SuperHalfs autumn half marathon
Cardiff Half Marathon Training Plan
Cardiff is a fast autumn half marathon. Build threshold strength, keep the plan realistic, and race with pace targets from your real data.
Sunday, October 4, 2026 - SuperHalfs autumn half marathon
Cardiff is a fast autumn half marathon. Build threshold strength, keep the plan realistic, and race with pace targets from your real data.
Race date
Sunday, October 4, 2026
Distance
half marathon
Location
Cardiff, United Kingdom
Training window
A 10-12 week block starts in mid-July 2026, with the hardest work in August and September.
Cardiff is a strong target for runners who want a focused autumn half-marathon block after summer base training.
The plan should balance threshold work with enough easy running to keep the legs fresh for race-specific pace practice.
RunRight updates sessions from Apple Watch data so the plan responds to what you actually completed, not what the calendar hoped for.
Course profile: Flat, fast urban half marathon where pacing discipline can turn fitness into a PB.
Race-day conditions: Early October UK weather can be excellent for racing, but rain and wind make effort-based pacing useful.
Race date source: SuperHalfs 2026 calendar.
| Goal | Pace min/km | Pace min/mi | Peak weekly volume | Training focus |
|---|---|---|---|---|
| Sub 1:30 | 4:16/km | 6:52/mi | 45-65 km | Threshold sessions, fast finish long runs, and precise pacing practice. |
| Sub 1:45 | 4:59/km | 8:01/mi | 35-55 km | Tempo strength, race-pace intervals, and enough easy mileage to stay fresh. |
| Sub 2:00 | 5:41/km | 9:09/mi | 25-45 km | Aerobic consistency, controlled long runs, and confidence at goal pace. |
| Finish strong | 6:00-6:45/km | 9:39-10:52/mi | 20-35 km | Progressive long runs, easy aerobic work, and race-day pacing discipline. |
Use progressive tempo sessions that build from controlled discomfort to confident race pace.
Half-marathon training gets hard quickly if easy days drift too fast. Let Apple Watch data keep easy days easy.
Practice effort-based pacing so wind or rain does not force a rigid pace plan.
RunRight reads recent runs, long-run durability, pace trends, heart rate, and VO2Max signals from Apple Health to estimate what you can handle now.
Miss a run, overperform, or fade in a workout, and RunRight adjusts the next sessions instead of forcing a static PDF plan.
Download RunRight, connect Apple Health, and get a race plan that adapts to your actual training before Sunday, October 4, 2026.
Try RunRight for freeThe 2026 Cardiff Half Marathon is scheduled for Sunday, October 4, 2026.
Cardiff is known as a flat, fast half-marathon course, but pacing and threshold preparation still determine whether the final 5 km holds together.
Yes. RunRight adapts future workouts from actual Apple Watch training history, including missed workouts and completed efforts.
Download RunRight free and start training smarter today.