Ageo City Half Marathon 2026 takes place on Sun, Nov 22, 2026 in Ageo, Japan. The main route is 21.1 km.
- Date
- Sun, Nov 22, 2026
- Start
- Ageo 🇯🇵
- Distance
- 21.1 km
- Level
- Mixed field
The Ageo City Half Marathon is an annual half marathon in Ageo, Saitama, run on a fast, flat course from Ageo Sports Park. It is open to citizen runners and doubles as a key pre-Hakone Ekiden tune-up for university teams.
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
1:45–2:10
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 Ageo City Half Marathon 2026 is 11 weeks away. This is how a coach divides that time. The first phase starts now.
01Build5 weeks · Sep 7, 2026 – Oct 11, 2026
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
02Peak3 weeks · Oct 12, 2026 – Nov 1, 2026
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
03Taper2 weeks · Nov 2, 2026 – Nov 15, 2026
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
04Race week1 week · Nov 16, 2026 – Nov 22, 2026
Openers, rest and logistics. The work is done; the job now is arriving fresh.
Similar races
Organising this race?