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Use our 2024 Frost Dates Calculator to find the average dates of the last light freeze of spring and the first light freeze of fall for locations across the U.S. and Canada. Enter your ZIP or Postal code in the field above to see frost dates for your location (based on the nearest weather station), as well as the length of your growing season based on frost dates.

A frost date is the average date of the last light freeze in spring or the first light freeze in fall.

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

• Light freeze: 29° to 32°F (-1.7° to 0°C)—tender plants are killed.
• Moderate freeze: 25° to 28°F (-3.9° to -2.2°C)—widely destructive to most vegetation.
• Severe freeze: 24°F (-4.4°C) and colder—heavy damage to most garden plants.

Note that frost dates are only an estimate based on historical climate data and are not set in stone. The probability of a frost occurring after the spring frost date or before the fall frost date is 30%, which means  there is still a chance of frost occurring before or after the given dates!