US Hardiness & Frost Table
Last frost date by ZIP code
Enter a 5-digit US ZIP code to look up your USDA hardiness zone, winter temperature band, average last spring frost date, and average first fall frost date.
Frost dates are averages and vary year to year across seasons and local microclimates.
Yearbed turns these dates into sowing windows for each crop.
Listed as “Yearbed: Garden Journal”.
Hardiness zone data: USDA-ARS / Oregon State University PRISM Climate Group (PHZM 2023)
Frost dates: NOAA National Centers for Environmental Information