First and Last Frost Dates by ZIP Code 2026

What Are Frost Dates?

Use our 2026 Frost Dates Calculator to find the first fall frost and last spring frost dates for your area, based on historical climate data from the weather station nearest your ZIP or Postal Code.

Your last spring frost date helps guide spring planting. Your first fall frost date helps you know when frost-sensitive crops may need harvesting and tender plants may need protection.

Frost dates are based on historical climate probabilities, not a forecast for this year, so actual conditions can vary.

What Is a First Fall Frost Date?

Your first fall frost date estimates when temperatures may first reach 32°F (0°C) or lower as the growing season winds down. Use it to help time fall harvests and protect frost-sensitive plants.

What Is a Last Spring Frost Date?

Your last spring frost date estimates when temperatures may last reach 32°F (0°C) or lower in spring. After this date, the chance of another freeze decreases, but cold weather can still occur.

Why Frost Dates Matter

Frost dates can help you:

• Time spring planting and transplanting
• Protect tender plants from cold
• Plan fall harvests
• Choose crops that fit your growing season

What Is the Growing Season?

For this calculator, the growing season is the period between your last spring frost and first fall frost. Knowing its approximate length can help you choose varieties, plan succession plantings, and time spring and fall crops.

Learn How to Extend the Growing Season.

Frost Date FAQs

Can frost happen after my last spring frost date or before my first fall frost date?
Yes. Frost dates are historical estimates, not guarantees. Always check your local forecast.

What does a 30% frost date mean?
For spring, there is a 30% chance of temperatures reaching 32°F or lower after the listed date. For fall, there is a 30% chance before the listed date.

Can frost occur when the temperature is above 32°F?
Yes. Frost can form when the official air temperature is in the mid-30s because surfaces near the ground can be colder than the measured air temperature.

More Gardening Tools

• Planting Calendar by ZIP Code
• Find Your Growing Zone
• Starting Seeds Indoors