Hardiness & Frost Zones Item Number: hardiness-zones

Hardiness zones determine which plants will survive in which regions. The U.S. Dept. of Agriculture and the National Weather Service have identified these regions within North America by their 60 yr. average minimum winter temperatures.

Zone	Last Frost	First Frost
1	Frost potential 365 days a year
2	May 1-May 31	August 1-August 31
3	May 1-May 31	September 1-September 30
4	May 1-May 31	September 1-September 30
5	March 31-April 30	September 30-October 31
6	March 31-April 30	September 30-October 31
7	March 31-April 30	September 30-October 31
8	February 28-March 31	October 31-November 31
9	January 31-February 28	November 30-December 31
10	January 31-or before	November 30-December 31
11	No Frost

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