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Bud Hardiness Data

2020-2021 Low Temperature Exotherm Data

Grapevine Cold Hardiness Monitoring

Winter low temperatures that fall below a critical value can damage grapevine buds.  The critical temperature for bud injury varies over the dormant season, and responds to daily changes in temperature.  We can measure this critical temperature through a procedure called differential thermal analysis, which involves controlled freezing of a sample of buds collected from vineyards. With funding from the New York Wine and Grape Foundation and the Kaplan fund, we are monitoring bud hardiness in four key varieties: Riesling, Cabernet Franc, Concord, and Cayuga White.  We monitor samples from Geneva weekly from November to March, and every two weeks for samples from Finger Lakes and Lake Erie vineyards between mid-winter and March.

You can access the previous eight years' information.