서울마라톤 takes place on Sun, Mar 21, 2027 in Seoul, South Korea. The main route is 42.2 km.
- Date
- Sun, Mar 21, 2027
- Start
- Seoul 🇰🇷
- Distance
- 42.2 km
- Level
- Open to all
Seoul Marathon is a prestigious World Athletics Platinum Label road race featuring a flat course starting at Gwanghwamun Square and finishing at Jamsil Olympic Stadium.
Official event pageWhat 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
3:45–4:30
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 서울마라톤 is 30 weeks away. This is how a coach divides that time. The first phase starts now.
01Base18 weeks · Aug 24, 2026 – Dec 27, 2026
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Dec 28, 2026 – Feb 7, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · Feb 8, 2027 – Feb 28, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · Mar 1, 2027 – Mar 14, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · Mar 15, 2027 – Mar 21, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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