GDD base 50 = 3153 . We track GDD at http://agebb.missouri.edu/weather/reports/gddTable.asp and rate the phenology stages according to the Modified E-L System https://door.extension.wisc.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf  Vivant  F E-L Stage 41 After harvest; cane maturation complete Vignoles F E-L Stage 41 After harvest; cane maturation … [Read more...] about Grape Phenology and GDD accumulation