When to stop accumulating GDD's

Winemaking Talk - Winemaking Forum

Help Support Winemaking Talk - Winemaking Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.


Sep 8, 2014
Reaction score
Most growing degree day references for grapes seem to use April though September or October as a standard. Here in Great Falls, MT we had our first frost/hard freeze on September 13th with a minimum temperature of 27F. My vines range from this years propagated and planted cuttings to mostly 2nd year vines and a single 3rd year Valiant. All are various cold Hardy hybrids. Many but not all leaves were fried by the cold. I really did not have much of a crop but was wondering if this is where I should stop accumulating growing degree days and call it a season or if any additional heat units would have any effect (if I did have a crop). I'm mostly wondering so that I can keep good records for reference I future years. ImageUploadedByWine Making1473917207.028041.jpg
Once the leaves are toast, there is no more energy going to ripening. Any grapes should be harvested asap.

Latest posts