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30 free tools — no signup, instant results
No calculators match your search. Try a different word like “soil”, “frost”, or “spacing”.
Every GardenCalc tool uses verified data sources — frost dates from NOAA's 30-year climate normals, hardiness zones from the 2023 USDA Plant Hardiness Zone Map, and spacing guidelines from Cornell, Purdue, and UC Davis extension services.
Each calculator runs entirely in your browser using JavaScript. Nothing you type is sent to any server — calculations happen locally, instantly, and privately. No account, no email, no data collection. Just the answer you need.
Our results are estimates based on average conditions. Actual outcomes depend on your specific soil, microclimate, variety, and growing practices. Use these tools as a starting point — then adjust based on what you observe in your garden each season.