Seed Sowing Date Calculator

Turn seed-packet “weeks before/after last frost” guidance into calendar dates.

Local microclimate, soil temperature, and variety notes come first. Average frost dates may need a 1-2 week buffer.

Expected last frost date Indoor sowing weeks before frost Transplant weeks after frost Days to maturity

GUIDE

How to use it

Calculate indoor sowing and transplant dates from the last frost date and crop timing.

The calculation is a starting point. Check drainage, soil condition, plant condition, and season together.

Is the result exact?

It is a reference based on simple presets and volume formulas. Adjust to the real growing conditions.

Is data sent to the server?

No. Calculations run in the browser only.