Seattle Half Marathon takes place on Sun, Nov 29, 2026 in Seattle, United States. The main route is 21.1 km.
- Date
- Sun, Nov 29, 2026
- Start
- Seattle 🇺🇸
- Distance
- 21.1 km
- Level
- Open to all
The UW Medicine Seattle Half Marathon is set on a scenic course featuring rolling hills and views of Seattle's iconic bridges and waterways.
Official event pageWhat this race demands
The Seattle Half Marathon demands consistent pacing over a 21.1-kilometer road distance featuring rolling hills.
Aerobic Capacity
Running 21.1 kilometers requires sustained aerobic output and efficient cardiovascular endurance for the duration of the effort.
Rolling Hill Resilience
The course features rolling hills, demanding muscular endurance and pacing discipline to manage changes in elevation without excessive 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
1:45–2:10
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 Seattle Half Marathon is 14 weeks away. This is how a coach divides that time. The first phase starts now.
01Base2 weeks · Aug 24, 2026 – Sep 6, 2026
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Sep 7, 2026 – Oct 18, 2026
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 · Oct 19, 2026 – Nov 8, 2026
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · Nov 9, 2026 – Nov 22, 2026
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · Nov 23, 2026 – Nov 29, 2026
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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