Treating the last frost as a safe planting day
Soil temperature and night lows still matter for tender crops.
Timing Tool · 1 min
Frost Date Calculator
Find the real planting boundary before you commit seed trays, transplants, or warm-season crops.
Turn last and first frost dates into frost-free days and seasonal planting windows.
What this tool decides
Decides whether your season is long enough for tender crops or better suited to transplants and cool-season timing.
- 1Set your inputs
- 2Calculate the number
- 3Read the plan
Frost Dates
Change any field and the result updates immediately.
Calculated resultEnter your measurements
The practical plan will appear here.
Read the Plan
How to use this result
What it means
A longer frost-free window supports direct-seeded warm crops. A short window favors transplants and quick varieties.
Next action
Use the season length to choose crops, then open the seed starting calculator for exact sowing dates.
Check these before using the number
Ignoring the fall frost date
A crop can start well and still run out of warm days before harvest.
Use frost dates as a timing boundary
This calculator counts the practical growing days between your average last spring frost and first fall frost.
A short result favors transplants, quick crops, and cool-season timing. Check the calendar before fixing a planting date.