Bad Gastein's summer season isn’t merely an extension of its ski resort, it stands as a distinct destination in its own right, and this distinction is crucial for investors. The town's thermal spa infrastructure operates regardless of the weather or season, anchoring a year-round tourism economy that many alpine resorts would envy.

The Hohe Tauern National Park provides a stunning backdrop for serious hiking. The flagship Gastein Trail spans 75 to 87 kilometres over six or seven stages, covering the full length of the valley with more than 4,500 meters of cumulative elevation gain.

This challenging route attracts dedicated mountain walkers from across Europe. For those seeking a more accessible option, the Gasteiner Höhenweg, which connects Bad Gastein to Bad Hofgastein, offers a fantastic 5.5 to 8-kilometre panoramic path with minimal elevation gain. This trail passes through the recently upgraded Gadaunerer Gorge. At the opposite end of the spectrum, the Reedsee alpine lake, located above 2,000 meters, rewards climbers with stunning high-mountain scenery, well off the typical tourist path.

Mountain biking has become a significant part of the valley's summer identity. The Fulseck singletrack in Dorfgastein - a 10-kilometre trail featuring 960 vertical meters of downhill terrain, accessible via a cable car for bike transport, is considered one of the best descents in the eastern Alps and has garnered a dedicated following.

An 18-hole golf course on the valley floor caters to a different demographic of summer visitors altogether.

The thermal spa experience becomes even more compelling in the summer, as the contrast between outdoor mountain activities and indoor thermal immersion is most pronounced. The Felsentherme, Garstenauer's extraordinary complex built into the rock face in 1968, is open year-round and features outdoor thermal pools with panoramic mountain views that are arguably more dramatic in the summer