GDD base 50 = 2695. We track GDD at  http://agebb.missouri.edu/weather/reports/gddTable.asp and rate the phenology stages according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf Chambourcin and Norton are fully colored. We are harvesting the majority of the grapes for distillation due to the spring freeze injury impacting the … [Read more...] about Grape phenology and GDD accumulation