Schloss Sommerberg, Fortified manor in Frauenstein, Germany.

Schloss Sommerberg is a two-story building with a stepped gable and tower bay, located on a hillside in Frauenstein near Wiesbaden. The structure displays early 1800s architecture and sits within a large garden featuring multiple planted areas.

The building was constructed between 1810 and 1820 and belongs to a period of major changes in the region. Count Paul von Hatzfeldt-Wildenburg later acquired the estate in the 19th century and shaped its development for decades to come.

The name Sommerberg comes from a tenant family called Sommer, recorded in the Frauenstein church register; the hill itself was earlier called Wolfsberg. The English landscape park laid out by Heinrich Siesmayer (1817–1900) survives, with almost 200 rhododendrons, old fuchsias and many roses. The estate lies behind walls and dense trees, so the plantings are seen from the surrounding paths.

The estate stands behind walls and dense trees on a slope at Georgenborner Straße 50, above Frauenstein toward Georgenborn. It is a private family property, so the grounds are not open to visitors; the building and park can only be seen from the public street. The 26-hectare nature reserve "Sommerberg bei Frauenstein" lies directly below the castle.

The hill was originally called Wolfsberg, a name recorded in church register notes around 1800. The estate's own name comes from an early tenant family called Sommer, and the Frauenstein church books list many Sommersberg entries. A farming family of that name still lived in Dotzheim in 1928.