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Knowing your last frost date can be helpful for knowing when to start your seeds, in order to be ready for spring planting. This is also the date that it is generally safe to put your houseplants, tropical plants, and other frost-sensitive plants outdoors.
Here are average last frost dates by zone. These dates can vary year by year.
Zone 1 • June 2
Zone 2 • May 20
Zone 3 • May 14
Zone 4 • May 10
Zone 5 • April 28
Zone 6 • April 19
Zone 7 • April 1
Zone 8 • March 26
Zone 9 • February 26
Zone 10-13 • No frost generally