Growing Degree Days (GDD) are a measure of heat accumulation used by horticulturalists to predict the date that a flower will bloom or a crop reach maturity. Statistics for the Northeast are provided on this Cornell Atmospheric Sciences & Turf Team website. See also our page on this topic.
Cornell Gardening page with information on average dates for last spring frost and first fall frost, US hardiness zone map, and microclimates.
Last updated February 2, 2022