Skip to main content
Calcimator

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
How to Use This Calculator
  1. Select your USDA Hardiness Zone (find yours at planthardiness.ars.usda.gov).
  2. Choose your Risk Level: conservative (10% frost probability), moderate (50%), or aggressive (90%).
  3. Review Last Spring Frost date, First Fall Frost date, Growing Season length in days, and the safe Planting Window.
Ad Placeholder

Related Calculators

USDA Growing Zone Calculator

Find your USDA Plant Hardiness Zone based on average annual extreme minimum temperature. Know what plants will thrive in your area.

Rainfall & Irrigation Calculator

Calculate lawn irrigation needs based on rainfall, lawn size, and target watering. See weekly water deficit, watering time, and cost.

Daylight Hours Calculator

Calculate sunrise, sunset, and total daylight hours for any location and date. See monthly daylight patterns.

Ad Placeholder