Wartenfels Castle

Wartenfels Castle (German: Schloss Wartenfels) stands on the far tip of the Dottenberg hill above the village of Lostorf in the Swiss canton of Solothurn. A medieval stronghold that grew into a baroque country residence, it is now a cultural centre open to visitors.

How did Wartenfels Castle come about?

The fortified complex dates from the 13th century and was built by the lords of Wartenfels, whose earliest known member appears in records in 1250. Its core was a tower serving both defence and living quarters, which was enlarged once in the early 15th century.

Who ruled the castle?

After several inheritance transfers, the city of Solothurn bought the Wartenfels-Lostorf lordship from Adrian von Bubenberg in 1465. The castle then served as the seat of the Gösgen bailiwick, an administrative district run by a city-appointed official, until 1498. After that it passed to private vassals.

The baroque residence

Around 1600 the Greder family acquired the property and turned it into a prestigious country residence with a baroque garden. The Grimm family made further changes in the mid-18th century. Sources disagree slightly on when they arrived: one gives 1747, another about 1750.

Decline and revival

During the 19th century the building fell into disrepair, and much of its furnishings were sold off toward the end of the century. In 1918 the Basel entrepreneur Georg Meidinger bought it and restored it as a showpiece residence.

Can you visit Wartenfels Castle?

Yes. The Schloss Wartenfels Foundation was established in 1978, with the municipality of Lostorf, the town of Olten and the canton of Solothurn taking part. The castle was contributed to the foundation in 1983 and has been publicly accessible as a cultural centre since 1997. Check current opening hours and the events programme before you go.

Where is the castle?

The castle lies near Lostorf in northern Switzerland, in the canton of Solothurn, at roughly 47.391° N, 7.935° E. Its position on a ridge tip gives it a commanding outlook and reflects its former strategic role.

What to know before visiting

• The castle combines medieval elements, including the old tower, with baroque alterations from the 17th and 18th centuries.
• Its history is well documented in the Historical Dictionary of Switzerland and in heritage publications of the canton of Solothurn.
• It now serves a cultural purpose, so visits can be tied to exhibitions and events.
• The Lostorf area suits a quiet outing combined with a walk in the Solothurn Jura hills.

Frequently asked questions

When was Wartenfels Castle built? The complex dates from the 13th century. The earliest known mention of the lords of Wartenfels dates from 1250.

Who owns the castle today? It belongs to the Schloss Wartenfels Foundation, in which the municipality of Lostorf, the town of Olten and the canton of Solothurn participate.

Is the castle open to tourists? Yes, it has been publicly accessible as a cultural centre since 1997. Check opening hours before arriving.

Who restored the castle in the 20th century? Georg Meidinger, a Basel entrepreneur, who bought it in 1918 and restored it as a residence.

What was the castle used for in the Middle Ages? It was a stronghold and residence of the lords of Wartenfels and, after Solothurn's purchase in 1465, the seat of the Gösgen bailiwick until 1498.