GDD base 50 accumulation for today = 3689 http://agebb.missouri.edu/weather/reports/gddTable.asp Phenology stages according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf Out last cultivar to be harvested, Norton, is coming off this week. First freeze occurred October 12, 2019 with a minimum temperature of 28.9 degrees F. … [Read more...] about Grape phenology and GDD accumulation