Hardiness Map / Frost Dates
USDA Plant Hardiness MapOn 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. 
Frost32+ degrees - a light Freeze, damage depends upon the duration of the frost, humidity, topography, etc. United States Zone Average Frost DatesZone 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 From Hardiness Map to Organic Fertilizers Info
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