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What to plant in March in Zone 3b

In March, Zone 3b gardeners can start indoors — 8 crops have a planting task this month.

Zone 3b frost: last ~05/20, first ~09/19. Dates computed from these and cited extension rules. For your exact town, use the ZIP tool.

Start indoors

CabbageStart indoorsCauliflowerStart indoorsBrussels SproutsStart indoorsKaleStart indoorsLettuceStart indoorsLeeksStart indoorsSwiss ChardStart indoorsParsleyStart indoors

← February   April →

Last verified 2026-07-16. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rules: UNH Extension, Johnny's, UGA Extension.