Frost Dates Calculator

Our frost dates calculator displays both the last spring frost date and first fall frost date for locations across the U.S. and Canada. Simply enter your ZIP or Postal code in the field below to see frost dates for your location.

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What are Frost Dates?

A frost date is the average date of the first or last light freeze that occurs in spring or fall. Note that local weather and topography may cause considerable variations. The possibility of frost occurring after the given spring dates and before the given fall dates is 50 percent.

The classification of freeze temperatures is based on their effect on plants: 

  • Light freeze: 29° to 32°F—tender plants are killed.
  • Moderate freeze: 25° to 28°F—widely destructive to most vegetation.
  • Severe freeze: 24°F and colder—heavy damage to most plants.

Gardeners: Get a head start on growing with our Planting Dates Calendar, customized to your location!

Find Frost Dates by State or Province