Growing Season Calculator
By USDA Zone
Get growing season details for your hardiness zone
Crop Timing
Calculate when to plant specific crop types
Formula
Growing Season = First Fall Frost Date - Last Spring Frost Date (in days)
Frequently Asked Questions
How do I find my USDA hardiness zone?
Visit the USDA Plant Hardiness Zone Map at planthardiness.ars.usda.gov and enter your zip code. Zones are based on the average annual minimum winter temperature. Most of the US falls in zones 3-10.
What is the growing season?
The growing season is the number of frost-free days between the last spring frost and the first fall frost. It ranges from about 100 days in zone 3 to year-round in zone 11. Most vegetables need at least 60-100 frost-free days.
When should I start seeds indoors?
Start seeds indoors 6-8 weeks before your last frost date for warm-season crops (tomatoes, peppers). Cool-season crops (lettuce, peas) can be direct-sown outdoors 2-4 weeks before the last frost.
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