GARDEN TOOLS

Do the garden math once.

Simple calculators for planning seeds, beds and planting dates. Results are estimates—weather and seed packets still win.

🌱 Seed-starting date

Work backward from your expected last frost.

Last frostWeeks before frostChoose a frost date.

Add a safety buffer after your expected last frost for warm-season crops.

Last frostDays after frostChoose a frost date.

Length (ft)Width (ft)Depth (in)

Estimate plants in a rectangular bed using square-grid spacing.

Bed length (ft)Bed width (ft)Spacing (in)

Area (sq ft)Depth (in)

The official 2023 USDA map is the right source for ZIP-level hardiness zones. Garden Geekery does not guess a zone from ZIP codes.

Open official USDA zone finder ↗Hardiness zones measure average annual extreme minimum temperature and are mainly a perennial-survival guide.