About GrowByCity

GrowByCity provides free planting calendars powered by climate data from NOAA, FAO, and Open-Meteo. Our mission is to help gardeners around the world know exactly when to plant, based on real climate data rather than guesswork.

How It Works

We combine local frost dates, USDA hardiness zones, average temperatures, and rainfall data to calculate optimal planting windows for each crop in each city. Our algorithms consider minimum and maximum temperature tolerances, frost sensitivity, and growing season length to provide personalized recommendations.

Our Data Sources

• NOAA (National Oceanic and Atmospheric Administration) -- Historical climate and frost date data
• FAO (Food and Agriculture Organization of the UN) -- Agricultural growing requirements and crop data
• Open-Meteo -- Climate API providing temperature, precipitation, and weather pattern data
• USDA Plant Hardiness Zone Map -- Zone classifications based on average annual minimum temperatures

Disclaimer

GrowByCity provides general planting guidance based on climate data. Actual conditions may vary from year to year. Microclimates, soil conditions, elevation, and other local factors can affect growing success. Always consider your specific garden conditions when making planting decisions.

Last updated: March 2026