Frost Dates, Growing Seasons & Hardiness Zones by City

Average last and first frost dates, growing season length and USDA hardiness zones for 60 U.S. cities, with planting calendars where frost dates apply.

Every date comes from NOAA's 1991–2020 U.S. Climate Normals for the nearest weather station that passes our quality rules, and every zone from the PRISM Group's USDA hardiness-zone ZIP tables. Pages show the station, its distance and a confidence rating. The methodology explains the data, the station rules and the planting rules and their sources.