Frost Date Calculator — US ZIP Code & Canadian Postal Code

Frost Dates & Grow Zone

Enter your US ZIP code or Canadian postal code to find your grow zone, last spring frost, first fall frost, and growing season length.

Your ZIP Code

Last Spring Frost

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average date

First Fall Frost

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average date

Growing Season

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frost-free days

Min Winter Temp

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average low

🌱 Next step: Use your last frost date in the Seed Starting Calculator to build your full planting schedule.

Frequently Asked Questions

What is a frost date?

A frost date is the average date of the last spring freeze or first fall freeze in your area. Gardeners use the last spring frost date to time seed starting and transplanting, and the first fall frost date to plan harvest deadlines.

How do I find my hardiness zone?

Your hardiness zone (USDA in the US, Canadian Hardiness Zone in Canada) is based on the average annual minimum winter temperature in your area. Enter your ZIP code in the calculator above to look up your zone automatically.

What does 'days to last frost' mean for seed starting?

Seed starting schedules count backward from your last frost date. For example, 'start 6–8 weeks before last frost' means you count back 42–56 days from your local last frost date to find when to sow indoors.