九十九里トライアスロン2026 takes place on Sat, Oct 3, 2026 in 一宮町, Japan. The main route is 113.1 km.
- Date
- Sat, Oct 3, 2026
- Start
- 一宮町 🇯🇵
- Distance
- 113.1 km
- Level
- Open to all
九十九里トライアスロンは、千葉県九十九里海岸（一宮海岸周辺）で開催される日本最大規模のトライアスロンレースで、初心者にも優しいフラットなコースが特徴です。
Official event pageWhat this race demands
This middle-distance triathlon covers a total of 113.1 kilometers on a flat course in Chiba Prefecture.
Aerobic endurance
Covering the total distance of 113.1 kilometers across three disciplines requires sustained aerobic capacity and efficient pacing over several hours.
Pacing discipline
The flat course profile removes significant climbing resistance, requiring athletes to maintain steady power and cadence without the relief of natural terrain variations.
A total duration exceeding two and a half hours requires consistent fueling, targeting 60 to 90 grams of carbohydrates per hour to sustain energy output.
Your road to race day
Race day at 九十九里トライアスロン2026 is 6 weeks away. This is how a coach divides that time. The first phase starts now.
01Peak3 weeks · Aug 23, 2026 – Sep 12, 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 13, 2026 – Sep 26, 2026
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
03Race week1 week · Sep 27, 2026 – Oct 3, 2026
Openers, rest and logistics. The work is done; the job now is arriving fresh.
Similar races
Organising this race?