Variability among cultivars is a precious resource to adapt viticulture to a changing environment. The aim of the VitAdapt project is to provide data from extensive phenotyping of a wide range of Vitis vinifera cultivars in order to optimize the use of this resource. Methods and results: The VitAdapt experimental block was planted in 2009 with 52 cultivars (31 reds and 21 whites). Each variety was planted with 5 replicates to rule out a possible soil effect. Since 2012, all varieties have been phenotyped for phenology, grape ripening dynamics, yield components, pruning weight and water use efficiency. Since 2015, leaf blade and petiole mineral analyses and micro vinifications have been implemented. Conclusions: The extreme phenotypic diversity among Vitis vinifera cultivars was confirmed. In 2015, bud break, flowering and veraison took place over a time span of 24, 16 and 40 days, respectively. Maximum sugar content ranged from 209 g/L (Chasselas) to 266 g/L (Carignan). These results can be used to maintain the best possible fit between the grapevine variety and the climate in a changing environment. Significance and impact of the study: Although the great variability within the Vitis vinifera species is a valuable resource for adaptation, precise phenotypical data for cultivars is limited. Most existing data is acquired in cultivar repositories which are not planted with replicates, which makes it impossible to separate variability induced by variations in soil type or depth from genotypic variability. The VitAdapt project provides high quality phenotypical data for 52 cultivars for major characteristics of grapevine cultivars.