First/Last Frost Date Calculator
Frost Dates by USDA Zone
Estimate frost dates based on your hardiness zone
Seed Starting Date
Calculate when to start seeds indoors based on frost date
Formula
Seed Start Date = Last Frost Date - (Weeks Indoors × 7 days)
Frequently Asked Questions
How do I find my last frost date?
Check with your local agricultural extension office or search online using your zip code. The USDA Plant Hardiness Zone Map provides general guidance. Local frost dates can vary significantly by elevation and microclimate.
When should I start seeds indoors?
Tomatoes: 6-8 weeks before last frost. Peppers: 8-10 weeks. Broccoli/cabbage: 4-6 weeks. Lettuce: 4 weeks. Always check the specific seed packet for recommendations.
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