Seed-starting calculator

Choose a location, freeze probability and crop. Calculate indoor sowing and outdoor planting dates, then export them to your calendar.

01 / LOCATION AND FREEZE DATELocationHistorical spring freeze riskPlanning year

Changing the year changes the calendar, not the climate normal. These are historical dates, not an annual forecast.

02 / YOUR SEED PACKETStart with a crop

Choose a crop to fill the indoor duration, then adjust your outdoor target.

What are you growing?

Weeks indoors

Days after freeze date

Indoor presets use Maryland Extension guidance. The outdoor delay remains yours to choose; it is not a crop-specific recommendation. Editing the duration switches to a custom plan.

PLANTING CALENDAR

Your planting dates

START SEEDS INDOORS—

Count back from your outdoor planting target.

SELECTED SPRING FREEZE DATE—

OUTDOOR PLANTING TARGET—

Confirm suitable soil temperatures and the local forecast.

See the complete local guide

Calendar dates are computed in your browser. No account, email or personal information required.