Green Mountain Marathon
South Hero, United States of America · Monday 19 October 2026
Green Mountain Marathon, held in October in South Hero, Vermont, is a scenic event that takes place on the west shore of South Hero and Grand Isle. The course is certified by USA Track and Field and features a flat to rolling terrain, with about half of the route being on hard-packed dirt roads. The race starts and finishes near the house where Clarence H. DeMar, a seven-time Boston Marathon winner, once lived.
Difficulty Calculator
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:m
:s
Adjusted Time
4:11:57
Time difference: +12.0 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain340m
Elevation High64m
Elevation Low29m
Weather Forecast
High21°C
Low12°C
Chance of Rain2%
How hard is Green Mountain Marathon?
Difficultharder than 67% of marathons
Flattest / easiestHardest
On our difficulty model, Green Mountain Marathon plays about 13 minutes slower than an average road marathon for a 3:30 runner. It ranks #376 hardest of 1151 marathons we analyse, and #202 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 Green Mountain 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 Green Mountain Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:04:43 | +04:43 |
| 3:30:00 | 3:38:09 | +08:09 |
| 4:00:00 | 4:11:57 | +11:57 |
| 4:30:00 | 4:46:05 | +16:05 |
| 5:00:00 | 5:20:32 | +20:32 |
| 5:30:00 | 5:55:16 | +25:16 |
| 6:00:00 | 6:30:17 | +30:17 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Green Mountain Marathon 2026 Course Analysis
Green Mountain Marathon is a full marathon held in South Hero, United States of America. It is scheduled for Monday 19 October 2026. The course is run on road surface with 340m of total climbing, with its high point near 64m above sea level. For registration and full race details, visit the official Green Mountain Marathon website.
Elevation Profile
This is a hilly course with 340m of total climbing, rising to around 64m above sea level. It pays to train on hills and to pace the climbs conservatively.
Expected Race Day Weather
Based on historical weather data for October, the expected race day conditions are as follows. Moderate temperatures between 12°C and 21°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 (2%), so dry conditions are likely.
Surface Type: Road
Green Mountain 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 Green Mountain Marathon against other marathons to find the right race for your goals.
Marathons of similar difficulty
If Green Mountain Marathon fits your goal, these courses play out about the same on our difficulty model.
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