Bosmarathon 21KM
Buggenhout, Belgium · Monday 28 September 2026
The Bosmarathon 21KM is a half marathon set in the charming town of Bogense on the island of Funen, Denmark. The race offers a picturesque course that leads participants through the quiet streets of Bogense, along coastal paths, and through lush, green forests. The route takes runners alongside the Little Belt, with stunning views of the water and nearby islands.
Difficulty Calculator
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:m
:s
Adjusted Time
3:53:32
Time difference: -6.5 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain61m
Elevation High28m
Elevation Low10m
Weather Forecast
High20°C
Low5°C
Chance of Rain0%
How hard is Bosmarathon 21KM?
Easyharder than 12% of marathons
Flattest / easiestHardest
On our difficulty model, Bosmarathon 21KM plays about 1 minute faster than an average road marathon for a 3:30 runner. It ranks #1009 hardest of 1150 marathons we analyse, and #10 of 10 in Belgium. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Bosmarathon 21KM?
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 Bosmarathon 21KM | Difference |
|---|---|---|
| 3:00:00 | 2:54:26 | −05:34 |
| 3:30:00 | 3:24:01 | −05:59 |
| 4:00:00 | 3:53:32 | −06:28 |
| 4:30:00 | 4:23:00 | −07:00 |
| 5:00:00 | 4:52:25 | −07:35 |
| 5:30:00 | 5:21:46 | −08:14 |
| 6:00:00 | 5:51:05 | −08:55 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Bosmarathon 21KM 2026 Course Analysis
Bosmarathon 21KM is a full marathon held in Buggenhout, Belgium. It is scheduled for Monday 28 September 2026. The course is run on road surface with 61m of total climbing, with its high point near 28m above sea level. For registration and full race details, visit the official Bosmarathon 21KM website.
Elevation Profile
This is a very flat course, with only 61m of total climbing and little change in altitude throughout. Flat profiles let you hold an even pace from start to finish, which makes this a fast, PB-friendly race.
Expected Race Day Weather
Based on historical weather data for September, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 5°C to 20°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a low chance of rain (0%), so dry conditions are likely.
Surface Type: Road
Bosmarathon 21KM 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 Bosmarathon 21KM against other marathons to find the right race for your goals.
Marathons of similar difficulty
If Bosmarathon 21KM fits your goal, these courses play out about the same on our difficulty model.