Clarence DeMar Marathon
Keene, United States of America · Sunday 27 September 2026
The Clarence DeMar Marathon is a competitive road race established in 1978 to commemorate Clarence DeMar, a prominent marathoner who lived in Keene, New Hampshire. The event takes place annually in and around Keene, located in southwestern New Hampshire, and typically features both a full marathon and a half marathon. The marathon course is a point-to-point route that finishes on the campus of Keene State College.
Difficulty Calculator
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:m
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Adjusted Time
4:08:43
Time difference: +8.7 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain197m
Elevation High276m
Elevation Low144m
Weather Forecast
High26°C
Low16°C
Chance of Rain3%
How hard is Clarence DeMar Marathon?
Difficultharder than 68% of marathons
Flattest / easiestHardest
On our difficulty model, Clarence DeMar Marathon plays about 11 minutes slower than an average road marathon for a 3:30 runner. It ranks #369 hardest of 1150 marathons we analyse, and #188 of 575 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 Clarence DeMar 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 Clarence DeMar Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:03:25 | +03:25 |
| 3:30:00 | 3:35:56 | +05:56 |
| 4:00:00 | 4:08:43 | +08:43 |
| 4:30:00 | 4:41:42 | +11:42 |
| 5:00:00 | 5:14:55 | +14:55 |
| 5:30:00 | 5:48:20 | +18:20 |
| 6:00:00 | 6:21:57 | +21:57 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Clarence DeMar Marathon 2026 Course Analysis
Clarence DeMar Marathon is a full marathon held in Keene, United States of America. It is scheduled for Sunday 27 September 2026. The course is run on road surface with 197m of total climbing, with its high point near 276m above sea level. For registration and full race details, visit the official Clarence DeMar Marathon website.
Elevation Profile
With 197m 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 September, the expected race day conditions are as follows. Moderate temperatures between 16°C and 26°C are expected. While comfortable for most runners, those targeting fast times should pay attention to hydration, as these temperatures can impact performance on race day. There is a low chance of rain (3%), so dry conditions are likely.
Surface Type: Road
Clarence DeMar Marathon is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare Clarence DeMar Marathon against other marathons to find the right race for your goals.
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