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United States Average Zone 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 first 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
Zone 11
Free of Frost throughout the year.
