The single most useful question a new gardener can ask is "what is the best planting calendar for my zone?" Your hardiness zone tells you the average minimum winter temperature in your area, which in turn tells you which perennials survive, when frost typically ends, and how long your growing season is.
1. Find your zone
In the United States, the USDA Plant Hardiness Zone Map divides the country into 13 zones (each split into "a" and "b" half-zones, 5°F apart). Elsewhere, equivalent maps exist for Australia, the UK, Canada, and Europe. Sapience Garden auto-detects your zone from your garden address.
2. Anchor on frost dates
A planting calendar is built around two anchor dates: your last spring frost and your first autumn frost. Almost every seed packet uses these as reference ("sow 2 weeks before last frost", "transplant after all danger of frost"). Sapience Garden surfaces both dates in the Climate tab.
3. Build the schedule
Group crops into cool-season (peas, lettuce, brassicas, spinach) and warm-season (tomatoes, peppers, beans, cucurbits). Cool-season crops sow 4–6 weeks before last frost; warm-season crops transplant 2 weeks after last frost. For autumn harvests, count backward from first frost.
4. Adjust for microclimate
Your zone is a starting point — slope, aspect, urban heat, walls, and tree cover can shift your effective zone by half a step.
5. Use a tool that updates with your weather
Static calendars get you 80% of the way. Start a free Sapience Garden trial to get a planting calendar tailored to your zone, microclimate, and plant inventory.