USDA Plant Hardiness Zone Map Plant hardiness zone map should be called cold weather map.
* What it really does do is predict the ‘lowest/coldest’ temperatures you can expect in your planting zone.
*What it ‘Does Not Do‘ is forecast your first or last average frost dates in your planting zone! Find Your First and Last Average Frost Dates
Federal “plant hardiness map was updated for the first time in two decades, revealing many areas where the coldest day of the year isn’t as cold anymore.
A key change in the update is using average temperature records from 1976-2005 instead of the earlier 1974-1986. The nation’s average temperature from 1976 to 2005 was two-thirds of a degree warmer than for the older time period map.
It’s important to recognize that the plant hardiness map represents the extreme coldest temperature a location experiences each year, averaged over a period of about 30 years. It is really an extreme cold map and does not track average temperatures.
Highly Recommended USDA Plant Hardiness Zone Map
Why is common sense so uncommon?
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