Frost Date Calculator
Enter your ZIP code to get your average last spring frost and first fall frost dates, plus a safe planting window for your area.
Frost Date Calculator Free Gardening Tools
Grow Smarter with GardenCalc
Plan your garden with precision. From frost dates to companion planting, our free calculators and tools take the guesswork out of every season.
50
States Covered
6
Free Tools
100%
Free — No Account Needed
Our Tools
Everything Your Garden Needs
Six precision tools built for home gardeners, homesteaders, and market growers alike.
Seed Starting Schedule
Build a custom week-by-week indoor seed starting calendar based on your frost dates and the plants you want to grow.
Seed Starting ScheduleCompanion Planting
Discover which plants thrive together and which to keep apart. Improve yields, deter pests, and maximize your garden beds.
Companion PlantingSquare Foot Planner
Visually lay out your raised beds. Know exactly how many plants fit per square foot so you never over-crowd again.
Square Foot PlannerMulch Calculator
Enter your bed dimensions and desired depth to find out exactly how many cubic yards or bags of mulch to order — no waste.
Mulch CalculatorBlog
Tips, guides, and seasonal advice from experienced gardeners. Learn when to plant, how to amend soil, and more.
BlogGet Notified When We Add Your State
New states are being added regularly. Drop your email and we'll let you know when your area is covered — plus seasonal planting reminders.
Why GardenCalc
Gardening Made Simple & Precise
No sign-up required. No fluff. Just the tools that help your garden thrive.
Location-Aware Calculations
All frost date and planting tools use your ZIP code to pull accurate USDA zone and historical climate data.
Works on Any Device
Check your seed schedule from your phone in the garden or plan beds on your laptop — fully responsive design.
Completely Free
Every tool on GardenCalc is 100% free with no account required. We believe great gardening info should be accessible to everyone.
Data-Driven Accuracy
Our calculators are built on NOAA climate normals and decades of agricultural extension research from land-grant universities.
Print-Friendly Results
Every calculator output is formatted to print cleanly so you can post your seed schedule or frost dates in the potting shed.
Nationwide Coverage
Frost dates and planting windows for ZIP codes in all 50 states, based on 30-year NOAA climate normals.