Seed Starting Date Calculator

It is the average date of the last spring frost for your area, after which freezing nights are unlikely. Local extension services and frost maps publish it by zip or postal code.

It depends on the crop. The seed packet usually states it, for example six to eight weeks for tomatoes and peppers, or two to four weeks for many leafy greens.

Tender plants can be damaged by a late frost, so warm-season crops go out one to two weeks after the last frost once nights stay mild and the soil has warmed.

Dates are treated as plain calendar dates in UTC, so the result is the same wherever you are. Frost dates are local averages, so treat them as a guide.

Yes. Some crops dislike transplanting and do better sown straight into the garden. For those, use the weeks-after-frost date as your outdoor sowing date.