Estimate first and last frost dates for any location using historical weather data. Perfect for gardeners and planting schedules.
What is Frost Date Calculator?
Plan your garden with confidence using our Frost Date Calculator. It analyzes 3 years of historical temperature data to estimate your average last spring frost and first fall frost dates, growing season length, safe planting date, and frost probability by month. Features a visual growing season timeline and current season status.
How to Use
Search for your city or garden location
View estimated last frost (spring) and first frost (fall) dates
Check the growing season length and safe planting date
See frost probability by month
Toggle between °F and °C
Frequently Asked Questions
How are frost dates calculated?
We analyze 3 years of historical daily minimum temperature data to find the average dates when temperatures first drop below 0°C (32°F) in fall and last drop below 0°C in spring.
How accurate are the estimates?
These are averages based on historical data. Actual frost dates can vary by 2-3 weeks in any given year depending on weather patterns.
What is the growing season?
The frost-free period between the last spring frost and first fall frost, when it's generally safe to grow tender plants outdoors.
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