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