Jungfrau-Marathon
Race Day Weather
Cool start, warm finish, headwinds
Runners will face a cool start at 46°F, warming to 59°F at the finish. With an average humidity of 70%, hydration will be crucial, especially during the climbs. Winds will be light at 3 mph, but headwinds will challenge runners from miles 3 to 27. The toughest conditions will be experienced during the significant climbs, particularly between miles 17 and 27, where effort will need to be adjusted.
This course climbs 5,732 ft from start to finish, so we look at it at 3 points, not just the start line. In a typical year, at 9:00/mi, you start at 46° and finish around 12:25 PM in 59°.
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Race Info
The Jungfrau-Marathon starts on the Höheweg in Interlaken, Switzerland, and finishes at the Eigergletscher station at 2,320 meters, below the north faces of the Eiger and Mönch. The 42.195-kilometer course runs flat along Lake Brienz for the first 10 kilometers before climbing through Wilderswil, Lauterbrunnen and Wengen, gaining about 1,953 meters overall. It draws roughly 4,000 entrants each September and enforces timed checkpoints at Wengen and the Wengernalp-Wixi junction to keep runners ahead of the mountain terrain.
