The right moment for every seed, in every ZIP code.
Name a crop and a place. We read the freeze record at your nearest climate station and answer with a precise window — and with the university source behind every number.
e.g. tomatoes in 30318 · garlic in Minneapolis · Denver’s season length
Records, not folklore
Freeze probabilities from the 1991–2020 NOAA normals at a named station near you — its distance always disclosed.
Windows, not dates
Planting time is a probability. Every answer is a range anchored to the freeze record — never a single “safe day”.
Chapter & verse
Each rule cites its university extension source, and where authorities disagree, the more cautious rule prevails. Read the methodology.
Popular windows
Why a window, not a date
Weather does not follow averages, so PlantingWindow never gives you a single “safe day.” Every answer is a range anchored to freeze probabilities, with the station, the climate-normal period, and the extension rule behind it in plain sight. For season planning across several crops, build a printable planting calendar.