The maps for hardiness zones were updated a bit. Depending where you are located around Madison you might be in zone 5b now instead of 5a.
Old Map: https://hort.extension.wisc.edu/files/2014/10/Cold-hardiness-map-high-resolution-791x1024.jpg
New Map: https://phzm-prod.ars.usda.gov/system/files/WI150_HS.png
This is exciting news. Anyone going to try Riesling or Gewurztraminer?
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