Hardiness Map / Frost Dates

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USDA Plant Hardiness Map

On January 25, 2012, the USDA released its updated hardiness map. The image below shows the new zones. You can click on the image to go to the USDA site, where you can click on your zone to view the new zone listings for your state.

Or enter your zip code for a closer view of the zones around you.

Frost

32+ degrees - a light Freeze, damage depends upon the duration of the frost, humidity, topography, etc.

United States Zone Average Frost Dates

Zone 1
Average dates the last frost - 1 Jun / 30 Jun
Average date of the first frost - 1 Jul to 31 Jul
vulnerable to frost 365 days per year

Zone 2
Average dates the last frost - 1 May to 31 May
Average dates first frost - 1 August to 31 August

Zone 3
Average dates the last frost - 1 May to 31 May
Average dates first frost - 1 September to 30 September

Zone 4
Average dates the last frost - 1 May to 30 May
Average dates the first frost - 1 September to 30 September

Zone 5
Average dates the last frost - 30 March to 30 April
Average dates the first frost - 30 September to 30 October

Zone 6
Average dates the last frost - 30 March to 30 April
Average dates the first frost - 30 September to 30 October

Zone 7
Average dates the last frost - 30 March to 30 April
Average dates the first frost - 30 September to 30 October

Zone 8
Average dates the last frost - 28 February to 30 March
Average dates the first frost - 30 October to 30 November

Zone 9
Average dates the last frost - 30 January to 28 February
Average dates the last frost - 30 November to 30 December

Zone 10
Average dates the last frost - 30 January or before
Average dates the first frost - 30 November to 30 December

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