Skip to main content
Zone 4B — March

What to Plant in March in Zone 4B

March in Zone 4B: 144 crops to start indoors, 0 to plant or direct sow outside, and 0 entering harvest window. Last frost averages May 11. Reference city: Duluth, MN.
Updated August 12, 2026 · Frost data from NOAA 1991-2020 Climate Normals
144 Start Indoors
0 Plant Outside
0 Harvest
Frost risk: High

Frost risk is still high in Zone 4B. The last spring frost typically lands on May 11, with the earliest plausible clearance around April 28. Hold tender crops indoors a while longer.

See full Zone 4B frost outlook

Start Indoors in March

Plant Type Start Indoors Transplant Outside Harvest Window
All Season Cabbage brassica Mar 23 Apr 27 Jul 6 – Jul 16
All Year Round Cauliflower brassica Mar 23 Apr 27 Jul 1
Brunswick Cabbage brassica Mar 23 Apr 27 Jul 26
Calabrese Broccoli brassica Mar 23 Apr 27 Jul 1
Carentan Leeks allium Mar 9 Apr 27 Jul 26 – Aug 15
Charleston Wakefield Cabbage brassica Mar 16 Apr 20 Jun 29
Copenhagen Cabbage brassica Mar 23 Apr 27 Jul 1
Danish Ballhead Cabbage brassica Mar 23 Apr 27 Aug 5 – Aug 15
Di Cicco Broccoli brassica Mar 23 Apr 27 Jun 11 – Jun 14
Drumhead Cabbage brassica Mar 23 Apr 27 Jul 26 – Aug 5
Early Jersey Wakefield Cabbage brassica Mar 16 Apr 20 Jun 24 – Jul 4
Early Purple Broccoli brassica Mar 23 Apr 27 Jul 1
Giant Musselburgh Leeks allium Mar 9 Apr 27 Aug 10
Glory of Enkhuizen Cabbage brassica Mar 23 Apr 27 Jul 26
Golden Acre Cabbage brassica Mar 23 Apr 27 Jul 1
Igloo Cauliflower brassica Mar 23 Apr 27 Jul 1 – Jul 6
Michihili Cabbage brassica Mar 16 Apr 20 Jun 29
OG American Flag Leeks allium Mar 9 Apr 27 Jul 26 – Aug 5
Red Acre Cabbage brassica Mar 16 Apr 20 Jul 4 – Jul 9
Savoy Perfection Cabbage brassica Mar 23 Apr 27 Jul 26 – Jul 31
Snowball Self-Blanche Cauliflower brassica Mar 23 Apr 27 Jul 1
Victoria Rhubarb vegetable Mar 9 Apr 27 Perennial — see plant page
Violetta Purple Cauliflower brassica Mar 23 Apr 27 Jul 1
Aji Amarillo Peppers pepper Mar 23 May 25 Aug 23 – Sep 22
Aji Dulce Peppers pepper Mar 23 May 25 Aug 23 – Sep 12
Alexandria Alpine Strawberry berry Mar 2 May 18 Perennial — see plant page
Anaheim Peppers pepper Mar 23 May 25 Aug 10 – Aug 18
Ancho Grande Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Angelica herb Mar 9 May 11 Jul 30 – Aug 9
Barletta, Pearly White Onions allium Mar 9 May 11 Jul 25 – Jul 30
Beefsteak Tomatoes tomato Mar 23 May 25 Aug 13 – Aug 18
Bhut Jolokia Ghost Pepper pepper Mar 16 May 25 Aug 23 – Sep 22
Big Jim Hatch Chile pepper Mar 16 May 25 Aug 3 – Aug 8
Birds Eye Hot Peppers pepper Mar 23 May 25 Sep 2 – Sep 12
Black Beauty Eggplant vegetable Mar 16 May 25 Aug 8 – Aug 23
Carolina Reaper peppers pepper Mar 9 May 25 Aug 23 – Sep 22
Casper Eggplant vegetable Mar 23 May 25 Aug 8
Catmint herb Mar 23 May 11 Perennial — see plant page
Cayenne Peppers pepper Mar 23 May 25 Aug 3 – Aug 18
Cherokee Purple Tomatoes tomato Mar 23 May 25 Aug 11 – Aug 18
Cherry Bomb peppers pepper Mar 9 May 25 Aug 8 – Aug 13
Chinese 5-Color Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Chocolate Bell Sweet Peppers pepper Mar 23 May 25 Jul 29 – Aug 13
Chocolate Habanero Hot Peppers pepper Mar 23 May 25 Aug 18 – Sep 7
Common Sage herb Mar 30 May 18 Perennial — see plant page
Corno di Toro Pepper pepper Mar 16 May 25 Aug 8 – Aug 13
Crego Mix Aster Flowers flower Mar 30 May 18 Aug 6 – Aug 16
Crimson Forest Bunching Onions allium Mar 23 May 11 Jul 10
Curly Parsley herb Mar 9 May 11 Jul 20 – Jul 30
Datil peppers pepper Mar 9 May 25 Aug 23 – Sep 12
Devils Tongue Yellow Hot Peppers pepper Mar 23 May 25 Aug 23 – Sep 12
Emerald Giant Sweet Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
English Lavender herb Mar 23 May 25 Perennial — see plant page
English Thyme herb Mar 9 May 11 Perennial — see plant page
English White Daisy Flowers flower Mar 9 May 11 Perennial — see plant page
Evergreen Bunching Onions allium Mar 23 May 11 Jul 10 – Jul 15
Firecracker Hot Peppers pepper Mar 23 May 25 Aug 13 – Sep 22
Fish Peppers pepper Mar 23 May 25 Aug 3 – Aug 13
Flat-Leaf Parsley herb Mar 9 May 11 Jul 20 – Aug 9
Florida Market Eggplant vegetable Mar 23 May 25 Aug 13 – Aug 23
Fresno Peppers pepper Mar 23 May 25 Aug 8 – Aug 13
Giant Maximum Mix Snapdragon Flowers flower Mar 9 May 11 Jul 30 – Aug 14
Gochugaru Korean Peppers pepper Mar 23 May 25 Aug 8
Golden Celery vegetable Mar 2 May 18 Aug 11 – Aug 21
Golden Marconi Sweet Peppers pepper Mar 23 May 25 Jul 29 – Aug 13
Grano Red Onions allium Mar 9 May 11 Sep 8
Grano White Onions allium Mar 9 May 11 Sep 8
Green Globe Artichoke vegetable Mar 16 May 25 Perennial — see plant page
Hatch Green Chile (NM 6-4) Peppers pepper Mar 23 May 25 Aug 3 – Aug 13
Highbush Blueberries berry Mar 16 May 25 Perennial — see plant page
Holiday Marbles Hot Peppers pepper Mar 23 May 25 Aug 23 – Sep 12
Hungarian Hot Wax Pepper pepper Mar 16 May 25 Jul 29 – Aug 8
Imperial Star Artichoke vegetable Mar 9 May 11 Aug 9 – Aug 19
Isis Candy Cherry Tomatoes tomato Mar 30 May 18 Jul 27 – Aug 6
Jalapeño Peppers pepper Mar 23 May 25 Jul 29 – Aug 8
Japanese Eggplant vegetable Mar 30 May 25 Jul 14 – Jul 29
Kellogg's Breakfast tomatoes tomato Mar 30 May 18 Aug 1 – Aug 11
Lemon Habanero Hot Peppers pepper Mar 23 May 25 Aug 18 – Sep 7
Lemongrass herb Mar 23 May 25 Perennial — see plant page
Long Green Louisiana Eggplant vegetable Mar 23 May 25 Jul 29 – Aug 3
Long Ping Tung Eggplant vegetable Mar 23 May 25 Jul 19 – Jul 24
Long Purple Italian Eggplant vegetable Mar 23 May 25 Aug 8
Mariachi Peppers pepper Mar 23 May 25 Jul 30 – Aug 8
Matt's Wild Cherry Tomatoes tomato Mar 30 May 18 Jul 12 – Jul 22
Mrs. Burns Lemon Basil herb Mar 30 May 18 Jul 17 – Jul 27
NuMex Twilight Hot Peppers pepper Mar 23 May 25 Aug 23 – Sep 22
Orange Habanero Hot Peppers pepper Mar 23 May 25 Aug 18 – Sep 7
Orange Horizon Sweet Peppers pepper Mar 23 May 25 Aug 8 – Aug 13
Ox-Eye Daisy Flowers flower Mar 9 May 11 Perennial — see plant page
Pandora Striped Eggplant vegetable Mar 23 May 25 Aug 8 – Aug 13
Pasilla de Oaxaca Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Paul Robeson tomatoes tomato Mar 30 May 18 Jul 27 – Aug 11
Pepperoncini Pepper pepper Mar 23 May 25 Jul 29 – Aug 8
Pimento Sweet Peppers pepper Mar 23 May 25 Aug 18 – Aug 23
Pineapple Tomatillos vegetable Mar 30 May 18 Jul 27 – Aug 6
Poblano Peppers pepper Mar 23 May 25 Jul 29
Powderpuff Aster Flowers flower Mar 30 May 18 Aug 1 – Aug 11
Pretty Purple Hot Peppers pepper Mar 23 May 25 Aug 23 – Sep 22
Purple Beauty Sweet Peppers pepper Mar 23 May 25 Aug 3 – Aug 8
Purple Tiger Hot Peppers pepper Mar 23 May 25 Aug 23 – Sep 2
Red Burgundy Onions allium Mar 9 May 11 Aug 29 – Sep 8
Red Caribbean Habanero Hot Peppers pepper Mar 23 May 25 Aug 18 – Sep 7
Red Cayenne Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Red Cherry Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 13
Red Mushroom Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Red Scotch Bonnet Pepper pepper Mar 16 May 25 Aug 28 – Sep 22
Rosemary herb Mar 9 May 25 Perennial — see plant page
Round Mauve Eggplant vegetable Mar 23 May 25 Aug 13 – Aug 23
Santa Fe Grande Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 13
Serrano Peppers pepper Mar 23 May 25 Aug 3 – Aug 13
Shasta Daisy Flowers flower Mar 9 May 11 Perennial — see plant page
Single Mix China Aster Flowers flower Mar 30 May 18 Jul 27 – Aug 6
Soapwort flower Mar 30 May 18 Perennial — see plant page
Southport Red Globe Onions allium Mar 9 May 11 Sep 8
Southport White Globe Onions allium Mar 9 May 11 Sep 8
Spanish Sweet White Onions allium Mar 9 May 11 Aug 29 – Sep 8
Sunbright Yellow Sweet Peppers pepper Mar 23 May 25 Aug 8 – Aug 13
Sweet Marjoram herb Mar 30 May 18 Aug 1 – Aug 16
Sweet Woodruff herb Mar 23 May 11 Perennial — see plant page
Tabasco Hot Peppers pepper Mar 23 May 25 Aug 13 – Aug 23
Tansy herb Mar 23 May 11 Perennial — see plant page
Tendercrisp Celery vegetable Mar 2 May 18 Aug 16 – Aug 31
Thai Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Trinidad Moruga Scorpion peppers pepper Mar 9 May 25 Aug 13 – Sep 22
Tropical Milkweed Flowers flower Mar 30 May 18 Perennial — see plant page
Turkish Orange Eggplant vegetable Mar 23 May 25 Aug 18 – Aug 23
White Cloud Sweet Peppers pepper Mar 23 May 25 Aug 3 – Aug 8
White Lisbon Bunching Onions allium Mar 23 May 11 Jul 10
Wormwood herb Mar 23 May 11 Perennial — see plant page
Yellow Jalapeno (Caloro) Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Yellow Mushroom Hot Peppers pepper Mar 23 May 25 Aug 8 – Aug 18
Yellow Scotch Bonnet Hot Peppers pepper Mar 23 May 25 Aug 23 – Sep 22
Yolo Wonder Sweet Peppers pepper Mar 23 May 25 Aug 3 – Aug 13
Banana Peppers pepper Mar 30 Jun 1 Aug 12
Big Bertha Peppers pepper Mar 30 Jun 1 Aug 10 – Aug 13
California Wonder Peppers pepper Mar 30 Jun 1 Aug 12 – Aug 15
Carmen Peppers pepper Mar 30 Jun 1 Jul 31 – Aug 20
Cubanelle Peppers pepper Mar 30 Jun 1 Aug 2 – Aug 10
Gypsy Peppers pepper Mar 30 Jun 1 Jul 31 – Aug 5
Jimmy Nardello Peppers pepper Mar 30 Jun 1 Aug 20 – Aug 30
King Arthur Peppers pepper Mar 30 Jun 1 Jul 30
Lunchbox Mini Peppers pepper Mar 30 Jun 1 Jul 26 – Jul 31
Padron Peppers pepper Mar 30 Jun 1 Jul 31
Shishito Peppers pepper Mar 30 Jun 1 Jul 31 – Aug 5

Plant Outside in March

Nothing to plant or sow outside in March for Zone 4B.
Next window: April — 85 varieties, including AC Wendy Strawberry, Albion Strawberry, All Season Cabbage.

Harvest in March

Nothing to harvest in March for Zone 4B.
Next window: May — 6 varieties, including Astro Arugula, Black Oil Sunflower Microgreens, Chervil.

Key Tasks for March in Zone 4B

  1. 1 Start 144 varieties indoors this month under grow lights or in a sunny south-facing window. Use a seed-starting mix and bottom heat (70–75°F) for best germination rates.
  2. 2 Check soil moisture before watering — stick a finger 2 inches into the soil. Water only when the soil is dry at that depth. Consistent moisture is more important than frequency.
Back to full Zone 4B planting calendar
October March in Zone 4B April

Get a Personalized March Calendar

SoilStack builds your exact planting schedule from your ZIP code — day-by-day tasks, weather prompts, and harvest tracking included.

Start Your Free Garden Calendar