Cardiff Half Marathon takes place on Sun, Oct 4, 2026 in Cardiff, United Kingdom. The main route is 21.1 km.
- Date
- Sun, Oct 4, 2026
- Start
- Cardiff 🇬🇧
- Distance
- 21.1 km
- Climbing
- 61 m
- Level
- Open to all
The Cardiff Half Marathon features a predominantly flat and fast course taking runners past the capital's most iconic landmarks, historic buildings, and scenic waterfronts.
Official event pageWhat this race demands
The Cardiff Half Marathon requires sustaining a steady aerobic pace over a flat 21.1-kilometer road course.
Aerobic endurance
Covering the half marathon distance of 21.1 kilometers requires sustained cardiovascular output without extended periods of relief.
Pacing discipline
The predominantly flat profile of the course encourages an aggressive early pace, requiring strict discipline to avoid premature fatigue.
What would it take you?
Pick the level closest to yours for an estimate of finish time on this course and the training a solid preparation needs.
Estimated finish
1:50–2:15
Peak-week training
5–7 h/week
A model estimate from distance, climbing and level, not a promise. Conditions, drafting and pacing move it.
IntervalCoach turns those weekly hours into a concrete plan built around your actual fitness. Start with this race as your goal
Your road to race day
Race day at Cardiff Half Marathon is 6 weeks away. This is how a coach divides that time. The first phase starts now.
01Peak3 weeks · Aug 24, 2026 – Sep 13, 2026
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
02Taper2 weeks · Sep 14, 2026 – Sep 27, 2026
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
03Race week1 week · Sep 28, 2026 – Oct 4, 2026
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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