Seed starting date calculator
PROStart-indoors date based on weeks before last frost.
Short answer: Days = weeks × 7 + days to germinate. 6 wk + 10 d germination = 52 days before your last frost. Enter your measurements above and the seed starting date calculator returns the quantity, unit conversions and an estimated cost instantly, in imperial or metric — no sign-up needed.
What do you need to measure?
What is the answer?
Start seeds
52 d before frost
In weeks
7.4 wk
How does the seed starting date calculator work?
Days = weeks × 7 + days to germinate.
What does a worked example look like?
6 wk + 10 d germination = 52 days before your last frost.
What do people ask most?
›How do I find last frost?
Search your zip on NOAA or Farmer's Almanac's frost dates page.
Which garden calculator should you use next?
Where can you learn more?
Read field notes on estimating and materials, or browse every calculator we make.