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About WhenPlant

Every home gardener asks the same question every month: what can I plant right now, here? The honest answer depends on three things nobody keeps in their head — your USDA hardiness zone, your local frost dates, and each crop's planting window. Generic advice ("plant tomatoes in spring") is useless when Zone 9 Florida and Zone 4 Minnesota differ by three months.

WhenPlant does the computation for you. Enter your ZIP; get your zone, your nearest weather station's real frost dates, and a personalized calendar for every crop — with every number traceable to its public source (USDA, NOAA, and university cooperative extensions). It's free and needs no sign-up.

See exactly how it works on the methodology page. Questions or corrections: get in touch.