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What to plant in March in Zone 4a

In March, Zone 4a gardeners can start indoors — 7 crops have a planting task this month.

Zone 4a frost: last ~05/14, first ~09/27. Dates computed from these and cited extension rules. For your exact town, use the ZIP tool.

Start indoors

BroccoliStart indoorsCabbageStart indoorsCauliflowerStart indoorsBrussels SproutsStart indoorsKaleStart indoorsLettuceStart indoorsSwiss ChardStart indoors

← February   April →

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