WhenPlant

Home › Zones › Zone 3b › March

What to plant in March in Zone 3b

In March, Zone 3b gardeners can start indoors — 14 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 indoorsCollardsStart indoorsCeleryStart indoorsKohlrabiStart indoorsArtichokeStart indoorsOreganoStart indoorsThymeStart indoors

← February   April →

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