Guides
How we read the data
Measured arguments about the climate data behind the tools. Every figure on these pages is recomputed from the published dataset each time the site is built, so none of them can drift from the numbers they describe.
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Your Hardiness Zone Is Not a Planting Date
A USDA zone is a winter-minimum statistic. Measured across 7,125 NOAA stations, it does not predict how long your growing season is — and the zones overlap.
Two ZIP codes in the same zone can be 140 days apart on season length. Here is the whole dataset behind that.