From Innsbruck main station by bus to the stop Neustift im Stubaital - Sulzenauhütte.
From Innsbruck you can reach the Stubai Valley in about 20 minutes via the Brenner motorway (Europabrücke), exit at Schönberg - continue to Neustift. From there continue towards the Stubai Glacier, the parking place of the Sulzenau Hütte is signposted.
Numerous free parking spaces at the bus stop/parking place Sulzenau Hütte.
Spanning an area of almost 50,000 m², Lake Grünau is the largest of the nine mountain lakes in the Stubai Valley. Located at an altitude of 2,335 m, it is what is known as a cirque lake, the bed of which was also forged by the moraines of the Wilde-Freiger glacier. These long-deserted rock masses date all the way back to the major glacial upheavals that occurred in 1850 and 1920. The lake’s immediate surrounding area is additionally characterised by glacial rock deposits left over by a mass of ice dating back over 10,000 years. Lake Grünau was fed by the “Kleiner Grünau” glacier, which – thanks to its murky glacial mix of water and fine mineral deposits – only served to render the lake’s appearance cloudy. However, since the complete melting of the glacier, the lake’s waters have been restored to their clear and wonderful array of colours. The lake releases its water into the “Freigerbach”, a tributary of the “Sulzenaubach”, which itself flows into the “Ruetz" River situated next to the “Grawa-Alm”. One stage of the “Stubaier Höhenweg” trail runs directly along the banks of the Grünausee Lake, between Sulzenau- and Nürnberger Hütte.
From the Sulzenau Hut car park shortly after the Grawa Alm, the trail leads over the bridge and then continues its winding ascent through the forest. Above the forest edge, you will reach the Sulzenaualm after about 1 hour. From there, the winding path continues for another hour up to the Sulzenau Hut. From the Sulzenau Hut, the trail runs eastwards, descending once briefly and then ascending to Grünausee lake. You will reach Grünausee lake from Sulzenau Hut after about 45 minutes. The same route leads back to the starting point.