Isar Cycle Path

Starting in Mittenwald we follow the Tyrolean part of the Isar Cycle Path uphill. Here we discover perhaps its most beautiful stage, which leads through the Hinterau Valley to the source of the Isar river in the area of the Kastenalm.

The 299 km long Isar Cycle Path connects Deggendorf with Munich and the Karwendel Valleys. In this article we deal exclusively with the uppermost section of the Isar Cycle Path, which leads from Mittenwald into the Tyrolean Hinterautal valley to the magical source area of the Isar. Starting in Mittenwald the cycle path follows the course of the Isar river (gravel surface) to the Riedboden. Then we continue across the border to the Tyrolean village of Scharnitz. Here the Isar Cycle Route crosses the A-Road B177.

Following the signposts to the Karwendel Valleys we cycle along the Hinterautal Road until the Wiesenhof inn. On the northern side of the valley, after the Gleirischhöhe hill, we cycle slightly downhill again to the banks of the Isar river. Slightly uphill, the gravel road now follows the course of the river to the so-called Isar origin “bei den Flüssen”. Underground watercourses from the Karwendel area rise to the surface here. As the Hinterautal MTB Route, the gravel road continues about two kilometres into the valley to the Kastenalm, where the valley divides. This tour, for which a mountain bike is recommended, can be classified as easy and offers the scenic beauty of the Karwendel Nature Park - from the impressive limestone mountains to the turquoise-blue waters of the Isar, with the natural highlight Isar-Source.

Route: Isar-Radweg IS, Hinterautalweg path MTB-Route, no. 578
Starting point: Mittenwald (910 m a.s.l.)
Destination: Kastenalm mountain hut (1,225 m a.s.l.)
Distance: approx. 23 km
Cycling time: approx. 2 hours
Altitude difference: evenly spread 365 meters in altitude uphill and about 50 m downhill (towards the Kastenalm hut)
Characteristics: near Scharnitz some asphalted sections, about 90% gravel road
Train & Bike: local train/city train connection in Scharnitz and Mittenwald (connection to Seefeld/Innsbruck resp. Munich)
Extended tour: by MTB further to the Hallerangerhaus mountain hut (1,770 m a.s.l.), approx. 5 km and 600 metres in altitude in addition

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