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What to plant in March in Zone 4a

In March, Zone 4a gardeners can start indoors — 14 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 indoorsCollardsStart indoorsCeleryStart indoorsKohlrabiStart indoorsArtichokeStart indoorsOreganoStart indoorsSageStart indoorsThymeStart indoors

← February   April →

Last verified 2026-08-28. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rules: UNH Extension, Johnny's, UGA Extension.