The must of the Curiel grape harvest Food and drink · Curiel de Duero, Campo de Peñafiel, Valladolid Image of Curiel de Duero, not of the place itself. Between the end of September and the beginning of October the village holds the grape harvest festival with a tasting of the freshly pressed must, in a municipal district where dry cereal farming, the vine and sheep still share out the land. Photo: Rastrojo (D•ES) (CC BY-SA 4.0) What to see and do in Curiel de Duero