Authors: Tony K. Wolf and John D. Boyer, Professor of Viticulture and Lecturer, Virginia Tech
Publication Number 463-020, December 2003
Figure 1. Median growing season-length isolines and elevation shading for Virginia and North Carolina.The isoline values are the median number of frost-free days from spring to fall. A temperature of 32°F is used to define frost-free days although grapevines can, under certain atmospheric conditions, withstand slightly cooler temperatures without injury.
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