Federspiel is a designation of ripeness for dry wines, a term used exclusively by members of the Vinea Wachau. Federspiel wines must fall between 11.5 and 12.5% ABV without chaptalization. The grapes are hand-harvested, typically in October, and are sent directly to press where they spontaneously ferment in stainless-steel tanks.

Ried Hinter der Burg, meaning “behind the old castle” of Weißenkirchen, is a southeast-facing site with sedimentary soils, rich in humus and containing “shotte” stones from the old Danube. The vineyard benefits from sitting just below the Hinter Seiber and its deep soils are especially well-suited to Grüner Veltliner. Prager produces only Grüner Veltliner Federspiel from this site.