Frost

32 ° F This is also referred to as a 'lite' freeze.
Damage depends upon the frost's duration, topography, humidity, etc...

Moderate Freeze

29 °F to 32 °F 'Killing Frost'
Tender plants are killed with little effect on other vegetation.

25 °F to 28 °F
There will be some damage to most vegetation and heavier damage to fruit blossoms and tender plants.

Severe Freeze

24 °F and colder
There is heavy damage to all but the hardiest of plants.

United States Average Zone Frost Dates

Zone 1

Average date of the first frost - July 1 to July 31
Average dates the last frost - June 1 to June 30
Note: This zone is vulnerable to frost 365 days per year

Zone 2

Average dates first frost - August 1 to August 31
Average dates the last frost - May 1 to May 31

Zone 3

Average dates first frost - September 1 to September 30
Average dates the last frost - May 1 to May 31

Zone 4

Average dates the first frost - September 1 to September 30
Average dates the last frost - May 1 to May 30

Zone 5

Average dates the first frost - September 30 to October 30
Average dates the last frost - 30 March to 30 April

Zone 6

Average dates the first frost - September 30 to October 30
Average dates the last frost - March 30 to April 30

Zone 7

Average dates the first frost - September 30 to October 30
Average dates the last frost - March 30 to April 30

Zone 8

Average dates the first frost - October 30 to November 30
Average dates the last frost - February 28 to March 30

Zone 9

Average dates the last frost - November 30 to December 30
Average dates the last frost - January 30 to February 28

Zone 10

Average dates the first frost - November 30 to December 30
Average dates the last frost - January 30 or before

Zone 11

Free of Frost throughout the year.

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