Estimate when to start seeds indoors, transplant seedlings, direct sow outdoors, or plan fall planting dates. Use your last frost date, first frost date, weeks before or after frost, germination days, hardening-off days, and transplant age.
Spring indoor mode:
The calculator estimates an outdoor transplant date from your last frost date, then counts backward to find when to start seeds indoors.
Spring direct sow mode:
The calculator estimates when seeds can be sown outdoors based on your last frost date and direct sow timing.
Fall planting mode:
The calculator counts backward from your first fall frost date using days to maturity and a harvest buffer.
Custom target mode:
The calculator uses your target planting date and counts backward to estimate indoor seed starting, germination, and hardening-off dates.
A seed starting date calculator helps plan when to start seeds indoors, when to harden off seedlings, when to transplant, and when to direct sow.
It can help reduce leggy seedlings, avoid planting too early, plan succession plantings, estimate harvest windows, and organize spring and fall garden schedules.
Your result shows the estimated seed starting date, transplant or outdoor planting date, direct sow date, germination date, hardening-off start date, estimated harvest date, fall planting date, and succession planting dates based on your frost dates and crop timing.
Estimate your outdoor planting date, then count backward by the number of weeks the crop should be started indoors before transplanting.
A last frost date is the estimated final spring date when frost is likely in your area. It is commonly used to plan spring planting and transplanting.
A first frost date is the estimated first fall date when frost is likely. It is commonly used to plan fall crops and estimate whether a crop has enough time to mature.
Hardening off means gradually exposing indoor-grown seedlings to outdoor conditions before transplanting them into the garden.
No. This is an estimate. Actual planting dates can vary based on weather, soil temperature, crop variety, microclimate, seed age, indoor light, and local growing conditions.