Abstract
<i>Vitis vinifera</i> adaptation to Oregon environments is examined in terms of four climatic indexes: expected 20-year minimum winter temperatures; Winkler9s heat summation index; Thornthwaite9s potential evapotranspiration index; and growing-season length. Oregon data from 123 stations are compared with representative European stations and recognized <i>V. vinifera</i> requirements. Values are mapped and overlaid to delineate optimal areas. Results indicate that <i>V. vinifera</i> wine-growing in Oregon east of the Cascade Range is limited by winter severity with climatic conditions at lower elevations resembling those of central and eastern Europe. <i>V. vinifera</i> wine-growing in Oregon west of the Cascade Range is limited by cool summers with climatic conditions in the interior valleys similar to those of Burgundy and the Rhine.
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