my planting zone has changed!

Garden Planning

My sister pointed out to me that the USDA has updated the plant zone hardiness map. In many areas, zones have changed reflecting warmer climates. I am just north west of Boston and was in zone 6a. Now I am squarely in zone 6b. This means there has been a 5*F change in minimum average extreme winter temperature. Up from -10* (in the last USDA version released in 1990) to -5* (the average from 1976 to 2005) in the map released a couple days ago.

A couple of links are here:
Plant zone maps at the USDA Agricultural Research Service and
An article at The Salt, NPR

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