Estimate your frost-free growing season, spring planting window, fall planting deadline, seed starting dates, transplant dates, and harvest timing using your last spring frost date and first fall frost date.
Growing season mode:
The calculator subtracts your last spring frost date from your first fall frost date to estimate frost-free growing days.
Spring planting mode:
The calculator adds a safety buffer to your last frost date for warm season planting and subtracts days for cool crop planting.
Fall deadline mode:
The calculator counts backward from the first fall frost date using days to maturity and a harvest buffer.
Seed starting mode:
The calculator estimates when to start seeds indoors by counting backward from the safe outdoor planting date.
A frost date calculator helps plan when to start seeds, transplant seedlings, direct sow outdoors, protect plants, and schedule fall crops.
It can help reduce frost damage, estimate the growing season length, plan succession planting, and compare spring planting dates with fall harvest deadlines.
Your result shows your estimated frost-free growing season, safe spring planting date, cool crop planting date, indoor seed starting date, hardening-off date, fall planting deadline, harvest date, frost risk windows, and succession planting dates.
A last frost date is the estimated final spring date when frost is likely in a location. Gardeners use it to plan spring planting, transplanting, and seed starting.
A first frost date is the estimated first fall date when frost is likely. It helps estimate the end of the growing season and the latest safe planting dates for fall crops.
Subtract the last spring frost date from the first fall frost date. The result is the estimated number of frost-free days between spring and fall frost risk.
Not always. Many gardeners add a safety buffer after the last frost date for warm season crops because weather can vary from year to year.
No. Frost dates are estimates. Actual frost risk can vary based on weather, elevation, microclimate, soil temperature, wind, cloud cover, and local growing conditions.