zone finder and an interactive map.

In 2015, the Arbor Day Foundation revised another map, also with no a and b subdivisions, showing many areas having zones even warmer, with the most notable changes in the Mid Atlantic and Northeast, showing cities like Philadelphia, New York City and Washington D.C. in zone 8, due to their urban heat islands.

In November 2023, the USDA released another updated version of their plant hardiness map, based on 1991-2020 weather data across the United States. The updated map shows continued northward

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