Frost Date Calculator
Find estimated last spring frost and first fall frost dates by USDA hardiness zone. Plan your garden planting window with confidence.
Inputs
Results
Last Spring Frost
Apr 20
First Fall FrostOct 20
Growing Season180 days
Planting WindowApr 20 through Oct 20
Last Spring Frost
Apr 20
How to Use This Calculator
- Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
- USDA Hardiness Zone — USDA hardiness zone. Choose from: Zone 3 (-40 to -30°F), Zone 4 (-30 to -20°F), Zone 5 (-20 to -10°F), Zone 6 (-10 to 0°F), Zone 7 (0 to 10°F), Zone 8 (10 to 20°F), Zone 9 (20 to 30°F), Zone 10 (30 to 40°F). default: 6.
- Risk Level — enter your preferred option from the dropdown. Choose from: Conservative (10% risk), Moderate (50% risk), Aggressive (90% risk). default: 1.
- Once all inputs are set, review your results in the Results panel. Here's what each output means:
- Last Spring Frost — your calculated result. This is the primary result of this calculator.
- First Fall Frost — your calculated result.
- Growing Season — shown as a numeric value.
- Planting Window — your calculated result.
- Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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