Sommerberg bei Frauenstein, Protected area in Wiesbaden, Germany.

The Sommerberg bei Frauenstein is a protected nature reserve in Wiesbaden with steep slopes and a valley containing the Erlenbach stream. The area spans about 26 hectares and contains scattered fruit trees as well as meadows with various grass species and rush vegetation.

The Sommerberg bei Frauenstein was designated a nature reserve on 11 December 1992 under the Hessian Nature Conservation Act, covering just over 26 hectares in the Rheingau-Wiesbadener Vortaunus natural region. It lies within the Rhein-Taunus Nature Park and the Stadt Wiesbaden landscape protection area.

The site is known for its snakes, particularly the rare Aesculapian species that lives here and can be observed by visitors along designated trails. Information boards along the paths tell the story of these animals and show how important this place is for their survival.

The reserve lies on a southwest-facing slope above the Erlenbach valley near Hof Armada, northwest of Frauenstein. The Schlangenpfad trail explains the Aesculapian snake and its habitat; the site is looked after by the Naturschutzhaus Wiesbaden and the Forsthaus Chausseehaus. Expect uneven, steep ground on the slope, so wear sturdy shoes.

The site is particularly known for heat-loving species, hosting specialized meadows with uncommon grass varieties. These warm-loving plant communities form an ecosystem that is rarely found elsewhere in the region.