Haselstein, Hill in Berglen, Baden-Württemberg, Germany

Haselstein is a 447.9 m high hill in Winnenden, Baden-Württemberg, standing about one kilometre northwest of Breuningsweiler. Its rocky cap of Stubensandstein is wooded, while vineyards cover the lower slopes to the southwest and north. On the south side lies a disused quarry with a 50-metre-long, up to 12-metre-high wall in the lower Stubensandstein.

The Haselstein lies on a north-northwest spur of the Buocher Höhe, which reaches 519.6 m at the water tower in Buoch. Its rocky cap is formed of Stubensandstein, a Middle Keuper sandstone whose firmly bound components were once quarried as building stone. The quarry on the south side, with a 50 m long and up to 12 m high working face, served as a climbing garden until 2003, when rockfall forced its closure.

A concrete path, the Geologischer Pfad, runs around the disused quarry on the south side of the hill; its concrete surface roughly marks the boundary between the vineyards on the Obere Bunte Mergel and the Stubensandstein above. From the path, the steppe heath flowers of the Haselstein nature monument can be seen from spring to autumn without entering the protected area.

Multiple marked trails lead around the summit and connect to nearby towns, with parking available at the base. The paths are accessible throughout the year for walkers of different abilities.

On the south side of the Haselstein, a disused quarry has a 50-metre-long wall up to 12 metres high in the Lower Stubensandstein. It served as a climbing garden until 2003, when rockfall forced its closure; the geological trail now passes around the outside.