Seacoast Half Marathon
Portsmouth, NH 03801, US, United States of America · Sunday 25 October 2026
The Seacoast Half Marathon welcomes people to discover coastal charm with New England's charm. It is one of its special scenic views. As they traverse one of what makes the coastline glow, test it. The race offers iconic beaches and water. As you test what makes this route well sought and the locals, that brings everyone to cheer! A beautiful day. What makes a scene transport and test, and has skill all tested here in New England. Step by step, see what to say. This challenge could be you to
Difficulty Calculator
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:m
:s
Adjusted Time
1:40:42
Time difference: -4.3 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain116m
Elevation High20m
Elevation Low2m
Weather Forecast
High12°C
Low3°C
Chance of Rain4%
How hard is Seacoast Half Marathon?
Easyharder than 4% of half marathons
Flattest / easiestHardest
On our difficulty model, Seacoast Half Marathon runs about 2 minutes faster than a flat, cool road half marathon - a genuine PB course for a 1:30 runner. It ranks #370 hardest of 386 half marathons we analyse, and #140 of 145 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 Seacoast Half Marathon?
Estimated finish times on this course versus the same effort on a flat, cool, road half marathon, based on its elevation, surface, and expected race-day temperature.
| Flat-course time | On Seacoast Half Marathon | Difference |
|---|---|---|
| 1:30:00 | 1:25:56 | −04:04 |
| 1:45:00 | 1:40:42 | −04:18 |
| 2:00:00 | 1:55:29 | −04:31 |
| 2:15:00 | 2:10:17 | −04:43 |
| 2:30:00 | 2:25:05 | −04:55 |
| 2:45:00 | 2:39:54 | −05:06 |
| 3:00:00 | 2:54:43 | −05:17 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Seacoast Half Marathon 2026 Course Analysis
Seacoast Half Marathon is a half marathon held in Portsmouth, NH 03801, US, United States of America. It is scheduled for Sunday 25 October 2026. The course is run on road surface with 116m of total elevation gain, reaching a maximum altitude of 20m above sea level. For registration and full race details, visit the official Seacoast Half Marathon website.
Elevation Profile
With 116m of elevation gain, this is a moderately undulating course. The route ranges from 2m to 20m above sea level (18m total range). While not completely flat, the elevation changes are manageable for most runners and shouldn't significantly impact pacing strategy.
Expected Race Day Weather
Based on historical weather data for October, the expected race day conditions are as follows. Cold conditions are expected, with temperatures between 3°C and 12°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: Road
Seacoast Half Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.
Looking for an easier marathon or a tougher challenge? You can also compare Seacoast Half Marathon against other half marathons to find the right race for your goals.
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If Seacoast Half Marathon fits your goal, these courses play out about the same on our difficulty model.
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