📅 Planting Date Calculator
When to start seeds based on last frost date
About this calculator
The Planting Date Calculator works backward and forward from frost dates. Enter your last spring frost and first fall frost dates; it counts back the days-to-maturity for each crop to give indoor start dates, transplant dates, and direct-sow windows. It also flags whether a long-season crop fits before fall frost.
Tip: use your own garden's observed frost dates rather than the county average — microclimates shift frost by two weeks, and one cold night erases a month of seedling work.