About Frostplot

Frostplot answers one question for U.S. gardeners: when is it safe to plant here? It shows frost dates with their odds and the weather station behind them, instead of a single date with no source.

Data and attribution

• Frost dates and season length: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020, annual/seasonal normals by station. Public domain (U.S. Government work).
• Places, ZIP Code Tabulation Areas and their coordinates: U.S. Census Bureau, Gazetteer files. Public domain.

Frostplot is an independent site. It is not affiliated with, or endorsed by, NOAA, NCEI or the U.S. Census Bureau. Values are shown as published; how they are used is explained on the methodology page.

Limits

Frost dates are climate statistics from 30 years of records, not a forecast. Your garden can be colder or warmer than the station, especially in valleys, on hills and near large water. Planting times are general guidance from university extension publications, not a guarantee of a harvest.

Privacy

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