
Oslo, Norway · Sunday 20 September 2026
Oslo Marathon is an annual event held between late September and early October in Oslo, Norway. The race features a flat course along the Oslofjord, with participants running two laps for the full marathon. The event includes a variety of distances, such as a half marathon, 10 km, and 3 km, making it accessible to runners of all ages and abilities. The marathon is part of a larger running festival, attracting thousands of participants each year.
Adjusted Time
4:02:28
Time difference: +2.5 minutes compared to a flat, road, temperate course.
On our difficulty model, Oslo Marathon adds about +6 minutes versus a flat, cool road marathon for a 3:30 runner. It ranks #723 hardest of 1245 marathons we analyse, and #12 of 21 in Norway. Use the calculator above to see the exact adjusted time for your own goal pace.
Estimated finish times on this course versus the same effort on a flat, cool, road marathon, based on its elevation, surface, and expected race-day temperature.
| Flat-course time | On Oslo Marathon | Difference |
|---|---|---|
| 3:00:00 | 2:59:05 | −00:55 |
| 3:30:00 | 3:30:40 | +00:40 |
| 4:00:00 | 4:02:28 | +02:28 |
| 4:30:00 | 4:34:30 | +04:30 |
| 5:00:00 | 5:06:43 | +06:43 |
| 5:30:00 | 5:39:08 | +09:08 |
| 6:00:00 | 6:11:42 | +11:42 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Oslo Marathon is a full marathon held in Oslo, Norway. It is scheduled for Sunday 20 September 2026. The course is run on road surface with 228m of total elevation gain, reaching a maximum altitude of 69m above sea level. For registration and full race details, visit the official Oslo Marathon website.
With 228m of elevation gain, this is a moderately undulating course. The route ranges from 3m to 69m above sea level (66m total range). While not completely flat, the elevation changes are manageable for most runners and shouldn't significantly impact pacing strategy.
Based on historical weather data for September, the expected race day conditions are as follows. Moderate temperatures between 15°C and 17°C are expected. While comfortable for most runners, those targeting fast times should pay attention to hydration, as these temperatures can impact performance over the full distance. There is a high chance of rain (76%). Runners should prepare for wet conditions, including appropriate footwear and clothing choices.
Oslo 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 Oslo Marathon against other marathons to find the right race for your goals.
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