Seattle Marathon
Seattle, United States of America · Sunday 29 November 2026
The Seattle Marathon is an annual road race held in Seattle, Washington, typically during late fall. The full marathon covers a distance of 26.2 miles and features a course that loops through various neighborhoods and notable locations in the city. The setting of the marathon includes urban streets, parkways, and notable Seattle landmarks such as the University of Washington campus, Green Lake, Gas Works Park, and the Ship Canal Bridge.
Difficulty Calculator
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:m
:s
Adjusted Time
4:34:43
Time difference: +34.7 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain190m
Elevation High52m
Elevation Low4m
Weather Forecast
High8°C
Low2°C
Chance of Rain4%
How hard is Seattle Marathon?
Very Difficultharder than 88% of marathons
Flattest / easiestHardest
On our difficulty model, Seattle Marathon plays about 37 minutes slower than an average road marathon for a 3:30 runner. It ranks #141 hardest of 1151 marathons we analyse, and #78 of 576 in United States of America. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Seattle Marathon?
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Seattle Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:28:30 | +28:30 |
| 3:30:00 | 4:01:45 | +31:45 |
| 4:00:00 | 4:34:43 | +34:43 |
| 4:30:00 | 5:07:30 | +37:30 |
| 5:00:00 | 5:40:07 | +40:07 |
| 5:30:00 | 6:12:38 | +42:38 |
| 6:00:00 | 6:45:04 | +45:04 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Seattle Marathon 2026 Course Analysis
Seattle Marathon is a full marathon held in Seattle, United States of America. It is scheduled for Sunday 29 November 2026. The course is run on trail surface with 190m of total climbing, with its high point near 52m above sea level. For registration and full race details, visit the official Seattle Marathon website.
Elevation Profile
With 190m of total climbing, this is a gently undulating course. The elevation changes are manageable for most runners and shouldn't greatly affect your pacing.
Expected Race Day Weather
Based on historical weather data for November, the expected race day conditions are as follows. Cold conditions are expected, with temperatures between 2°C and 8°C. While cold weather reduces overheating risk, runners should dress in layers and be prepared for potential wind chill. There is a low chance of rain (4%), so dry conditions are likely.
Surface Type: Trail
Seattle Marathon is a trail race, meaning the course includes unpaved surfaces such as dirt, gravel, or forest paths. Trail surfaces are usually slower than the road equivalent - often by 10-20% - because of uneven footing, technical sections, and frequently steeper gradients, though a smooth, non-technical or downhill trail can run faster than that suggests. Trail-specific shoes with good grip are recommended.
Looking for an easier marathon or a tougher challenge? You can also compare Seattle Marathon against other marathons to find the right race for your goals.
Marathons of similar difficulty
If Seattle Marathon fits your goal, these courses play out about the same on our difficulty model.
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