European vine hardiness compared to Concord

Nice presentation of freeze hardiness data on various popular wine grapes from Europe and the American standard, Concord.  The article has a very nice table listing each variety, complete with graphs showing how hardiness varies during the winter season.  In this data set, Concord doesn't standout as exceptionally hardy.

Grapevine Cold Hardiness

Real-Time Cold Hardiness Monitoring

Critical temperatures for wine and juice grapes are determined using a method called “differential thermal analysis” as described by Mills et al. (2006) [no relation]. These data are updated approximately weekly from mid-October through mid-April. Data is collected from buds and canes (node positions 4-7) on mature vines grown at the WSU Irrigated Agriculture Research and Extension Center (5 miles north of Prosser, WA) and from nearby commercial vineyards.