ZonePlanter.com provides free garden planning tools including USDA zone lookup, companion planting guides, planting calendars, and garden maintenance calculators. With 25 calculators across 4 categories — from planting zone finders and frost date calculators to companion planting guides and soil amendment tools — we cover the tools gardeners actually need, without the clutter.
Our mission is simple: give gardeners accurate, fast, and free planning tools with no barriers. There are no accounts to create, no paywalls to hit, and no personal data to hand over. You open a calculator, enter your garden details, and get your answer. That's it.
Every calculator on ZonePlanter uses standard horticultural formulas, USDA zone data, and established companion planting research. We build each tool with care for both accuracy and speed, so the math runs entirely in your browser with instant results.
Whether you're finding your USDA hardiness zone, planning companion plantings with the Three Sisters method, calculating seed quantities for your raised beds, or scheduling your planting calendar around frost dates, ZonePlanter is here to help. We always recommend checking with your local agricultural extension office for area-specific recommendations.
Free, fast, and built for every gardener.