Planting calculators
Lay out your beds, find your frost dates and seed starting schedule, and work out how many plants your household needs, all from published extension guidance.
Spacing
Plant Spacing Calculator
Pick a crop or a spacing and see how many plants fit your bed, row, circle or acre, in square, triangular or rows.
Square Foot Gardening Calculator
Tap squares to plant a 4 x 4 or 4 x 8 bed, see how many plants each crop takes per square, and print the chart.
Hedge Spacing Calculator
Enter the hedge length and plant, and get the number of plants for a single or double staggered row, with a mature width check.
Tree Spacing Calculator
Turn tree spacing into trees per acre or hectare, for an orchard, a plot or a windbreak row, with rootstock presets.
Plan the garden
Raised Bed Planner
Lay out your raised beds in 1 ft squares and get plant counts, a shopping list, soil and water for the whole plan.
Garden Size Calculator
Enter your household and crops to get plants per person, row feet, bed area, 4 x 8 beds and expected harvest.
Succession Planting Planner
Turn your frost dates into a succession planting schedule with sowing dates, harvest windows and a timeline chart.
Seed starting
Seed starting by zone
When to Start Seeds Indoors in Zone 3
Start indoor, transplant, direct sow and fall dates for every crop in zones 3a and 3b, with their frost dates.
When to Start Seeds Indoors in Zone 4
Start indoor, transplant, direct sow and fall dates for every crop in zones 4a and 4b, with their frost dates.
When to Start Seeds Indoors in Zone 5
Start indoor, transplant, direct sow and fall dates for every crop in zones 5a and 5b, with their frost dates.
When to Start Seeds Indoors in Zone 6
Start indoor, transplant, direct sow and fall dates for every crop in zones 6a and 6b, with their frost dates.
When to Start Seeds Indoors in Zone 7
Start indoor, transplant, direct sow and fall dates for every crop in zones 7a and 7b, with their frost dates.
When to Start Seeds Indoors in Zone 8
Start indoor, transplant, direct sow and fall dates for every crop in zones 8a and 8b, with their frost dates.
When to Start Seeds Indoors in Zone 9
Start indoor, transplant, direct sow and fall dates for every crop in zones 9a and 9b, with their frost dates.
When to Start Seeds Indoors in Zone 10
Start indoor, transplant, direct sow and fall dates for every crop in zones 10a and 10b, with their frost dates.