First and Last Frost Dates by USDA Zone

First and last frost dates are important to know; however, they're an average and often inaccurate. Learn the best way to determine them.

Growing Season Length - Hardiness Zone Map - First Last Frost Dates

Planting Calendar Climate Zone 5b — Deep Roots Project

USA Hardiness Zones Frost Dates

Frost Dates & Growing Season – Illinois State Climatologist

Understanding First and Last Frost Dates - The Home Depot

Agricultural Interests

The Who, What, When, Where, and Why's of a Planting Zone – American Lawn Mower Co. EST 1895

Frost Dates & Growing Season – Illinois State Climatologist

First and Last Frost Dates and the Garden Growing Season

How do I find my grow zone? – Ferry-Morse

US First and Last Frost Dates - Farm Homestead

What Is the First Frost Date Where You Live?

Illinois First Fall Freeze Climatology – Illinois State Climatologist