What to plant in March in zone 3b
202 crops to start indoors, direct sow, transplant, or harvest in March in USDA hardiness zone 3b. Typical last spring frost around May 17, 2026, first fall frost around Sep 26, 2026 — exact dates vary by location within the zone.
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Start indoors
Sow these under lights or on a windowsill now for transplants later.
- Achillea
- Agastache
- Aji Pepper
- Alpine Strawberry
- Angel Wing Begonia
- Angelica
- Angelonia
- Arabis
- Armeria
- Arroyo Lupine
- Arugula
- Asclepias
- Asparagus Fern
- Aster
- Bacopa
- Basket of Gold
- Bee Balm
- Beet
- Begonia
- Bishop's Flower
- Bok Choy
- Bolivian Begonia
- Broccoli
- Broccoli Raab
- Brussels Sprouts
- Cabbage
- Cabbage Microgreens
- California Bluebell
- Campanula
- Canna
- Canterbury Bells
- Cardoon
- Carnation
- Catnip
- Cauliflower
- Celtuce / Stem Lettuce
- Chicory
- China Aster
- Chinese Broccoli
- Chinese Cabbage
- Chinese Forget-Me-Not
- Clasping Coneflower
- Coast Rock Cress
- Coleus
- Collard
- Columbine
- Corn Poppy
- Cottage Pink
- Creeping Thyme
- Delphinium
- Dove Pincushion
- Dracaena
- Dusty Miller
- Echinacea
- Endive
- English Daisy
- European Columbine
- Evening Primrose
- Flowering Cabbage
- Flowering Kale
- Foxglove
- Geranium
- Geum
- Goldmoss Stonecrop
- Hamburg Parsley
- Hartweg Lupine
- Heliotrope
- Heuchera
- Hollyhock
- Horehound
- Hybrid Columbine
- Hybrid Coneflower
- Hybrid Lobelia
- Hypoestes
- Hyssop
- Iberis
- Iceland Poppy
- Impatiens
- Ivy Geranium
- Japanese Mugwort
- Johnny Jump-Up
- Kale
- Kale Microgreens
- Kniphofia
- Kohlrabi
- Komatsuna Microgreens
- Komatsuna Mustard
- Lanceleaf Coreopsis
- Large-Flowered Evening Primrose
- Larkspur
- Lavatera
- Lavender
- Lemon Balm
- Lemon Mint
- Lettuce
- Lettuce Crisphead Microgreens
- Lettuce Leaf Microgreens
- Lettuce Microgreens
- Lettuce Romaine Microgreens
- Liatris
- Linaria
- Lobelia
- Lovage
- Lunaria
- Lupine
- Malva
- Marjoram
- Mexican Hat
- Mexican Tarragon
- Mibuna
- Mibuna Microgreens
- Milkweed (Common)
- Milkweed (Tropical)
- Mimosa
- Mimulus
- Mitsuba
- Mizuna
- Mizuna Microgreens
- Myosotis
- New England Aster
- Nierembergia
- Oregano
- Oregano (Greek)
- Oregano Microgreens
- Oriental Poppy
- Osteospermum
- Ox-Eye Daisy
- Painted Sage
- Pak Choi Microgreens
- Palace Purple Heuchera
- Pansy
- Paracress
- Parsley
- Parsley Microgreens
- Pennyroyal Mint
- Penstemon
- Pepper (Habanero)
- Pepper (Sweet & Hot)
- Peruvian Verbena
- Petunia
- Phlox
- Plains Coreopsis
- Plectranthus
- Purple Yu Choy Sum
- Radicchio
- Rocket Candytuft
- Rocky Mountain Penstemon
- Roman Chamomile
- Romanesco Broccoli
- Rudbeckia
- Rue
- Russian Kale
- Russian Kale Microgreens
- Russian Sage
- Rutabaga
- Sage
- Salad Burnet
- Salpiglossis
- Salvia
- Saponaria
- Savory
- Scarlet Sage
- Sedum
- Shasta Daisy
- Sheep Sorrel
- Sheep Sorrel Microgreens
- Showy Evening Primrose
- Siberian Kale
- Smooth Aster
- Snapdragon
- Soapwort
- Sprenger Fern
- Statice
- Stevia
- Stipa
- Stock Flower
- Sundial Lupine
- Sweet Pea
- Sweet Woodruff
- Tansy
- Tarragon
- Tat Soi
- Tatsoi Microgreens
- Tendergreen Mustard Microgreens
- Texas Bluebonnet
- Texas Sage
- Thyme
- Torenia
- Turnip
- Turnip Microgreens
- Veined Catmint
- Verbena
- Veronica
- Vietnamese Culantro
- Vinca
- Viola
- Wax Begonia
- Western Coneflower
- Woodland Sage
- Woodland Tobacco
- Wormwood
- Yu Choy Sum
Keep going
Timings use NOAA 1991–2020 climate normals for a representative location (Hannah, ND) in zone 3b, computed with the same engine as GardenDraft’s in-app schedule. Guidance, not guarantees — your exact dates depend on your address.