Fall Planting Calculator
Work backwards from expected fall frost to planting deadlines using a maturity range, your seasonal adjustment and a full-date harvest buffer.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
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How to use this calculator
Enter expected frost, minimum and maximum maturity days, extra seasonal days, harvest buffer and when your planting area becomes available.
Planting is day zero. Maturity must finish before the full buffer dates and the frost date. The earlier deadline allows the slower maturity estimate; the later deadline allows only the faster estimate.
A worked example
October 15, 2027 frost, 50-65 maturity days, ten seasonal days and seven full harvest dates give planting deadlines from July 24 through August 8.
Will these dates ensure a harvest?
No. Frost, crop maturity and seasonal adjustments are estimates. Use local growing guidance and actual conditions to choose the values.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results in that range. Daily plans allow up to 366 dates; dark-sky searches allow 31 nights. Durations, capacities and policy rules are supplied by you. Astronomy uses the bundled Astronomy Engine, sea-level geometry and browser time-zone rules. Timed exports use UTC instants; date-only events do not assign a clock time. Copy, CSV and print include calculation assumptions. Nothing is booked or scheduled outside this page.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.