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Zone 6A — March

What to Plant in March in Zone 6A

March in Zone 6A: 138 crops to start indoors, 30 to plant or direct sow outside, and 0 entering harvest window. Last frost averages April 29. Reference city: Columbus, OH.
Updated May 13, 2026 · Frost data from NOAA 1991-2020 Climate Normals
138 Start Indoors
30 Plant Outside
0 Harvest
Frost risk: High

Frost risk is still high in Zone 6A. The last spring frost typically lands on April 29, with the earliest plausible clearance around April 15. Hold tender crops indoors a while longer.

See full Zone 6A frost outlook →

Start Indoors in March

Plant Type Start Indoors Transplant Outside Harvest Window
Alaska Early Pea legume Mar 21 Mar 28 May 22 – May 27
Black Salsify root vegetable Mar 14 Mar 21 Perennial — see plant page
Broad Windsor Fava Bean legume Mar 21 Mar 28 Jun 11 – Jun 21
Caraway herb Mar 21 Mar 28 Perennial — see plant page
Cascadia Sugar Snap Pea legume Mar 21 Mar 28 Jun 1 – Jun 3
Charleston Wakefield Cabbage brassica Mar 14 Mar 28 Jun 11
Chervil herb Mar 21 Mar 28 May 2 – May 12
Crimson Cherry Rhubarb Root vegetable Mar 14 Mar 21 Perennial — see plant page
Dandelion herb Mar 21 Mar 28 Perennial — see plant page
Delicatesse Blue Kohlrabi brassica Mar 21 Mar 28 May 22 – May 27
Delicatesse White Kohlrabi brassica Mar 21 Mar 28 May 22 – May 27
Dutch Yellow Shallots allium Mar 14 Mar 21 Jun 19 – Jul 19
Early Jersey Wakefield Cabbage brassica Mar 14 Mar 28 Jun 1 – Jun 11
French Red Shallots allium Mar 14 Mar 21 Jun 19 – Jul 19
Giant Imperial Mix Larkspur Flowers flower Mar 21 Mar 28 Jul 6 – Jul 26
Green Arrow Pea legume Mar 21 Mar 28 Jun 1 – Jun 6
Hard Red Wheat Cover Crop cover crop Mar 21 Mar 28 Jun 11 – Jul 1
Holland Red Shallots allium Mar 14 Mar 21 Jun 19 – Jul 19
Little Marvel Pea legume Mar 21 Mar 28 May 27 – May 30
Mammoth Melting Sugar Snow Pea legume Mar 21 Mar 28 Jun 4 – Jun 10
Michihili Cabbage brassica Mar 14 Mar 28 Jun 6
Oregon Giant Snow Pea legume Mar 21 Mar 28 Jun 6 – Jun 10
Oregon Sugar Pod Snow Pea legume Mar 21 Mar 28 May 27 – Jun 4
Progress No. 9 Shelling Pea legume Mar 21 Mar 28 May 25 – May 29
Red Acre Cabbage brassica Mar 14 Mar 28 Jun 11 – Jun 16
Sugar Ann Snap Pea legume Mar 21 Mar 28 May 19 – May 23
Tatsoi lettuce Mar 7 Mar 21 Apr 15 – May 5
Vienna Purple Kohlrabi brassica Mar 21 Mar 28 May 22 – Jun 1
Vienna White Kohlrabi brassica Mar 21 Mar 28 Jun 1
Wando Pea legume Mar 21 Mar 28 May 30 – Jun 4
Alexandria Alpine Strawberry berry Mar 14 Apr 25 Perennial — see plant page
All Season Cabbage brassica Mar 21 Apr 4 Jun 13 – Jun 23
All Year Round Cauliflower brassica Mar 21 Apr 4 Jun 8
Angelica herb Mar 21 Apr 18 Jul 7 – Jul 17
Baby's Breath Flowers flower Mar 28 Apr 18 Perennial — see plant page
Barletta, Pearly White Onions root vegetable Mar 21 Apr 18 Jul 2 – Jul 7
Blue Flax Flowers flower Mar 28 Apr 4 Perennial — see plant page
Bouquet Dill herb Mar 28 Apr 4 May 24 – Jun 8
Brilliant Celeriac root vegetable Mar 7 Apr 18 Aug 6 – Aug 16
Brunswick Cabbage brassica Mar 21 Apr 4 Jun 23 – Jul 3
Calabrese Broccoli brassica Mar 21 Apr 4 Jun 8
Cardoon (Purple Artichoke Thistle) vegetable Mar 28 Apr 25 Perennial — see plant page
Carentan Leeks allium Mar 14 Apr 4 Jul 3 – Jul 23
Catmint herb Mar 28 Apr 18 Perennial — see plant page
Chinese Forget-Me-Not Flowers flower Mar 28 Apr 4 Jun 8 – Jun 28
Common Sage herb Mar 28 Apr 25 Perennial — see plant page
Copenhagen Cabbage brassica Mar 21 Apr 4 Jun 8
Crackerjack Mix Marigolds flower Mar 28 Apr 18 Jun 17 – Jul 2
Crimson Forest Bunching Onions root vegetable Mar 28 Apr 18 Jun 17
Curly Parsley herb Mar 14 Apr 18 Jun 27 – Jul 7
Daikon Radishes root vegetable Mar 28 Apr 4 May 19 – May 29
Danish Ballhead Cabbage brassica Mar 21 Apr 4 Jul 13 – Jul 23
Dark Green Italian Giant Parsley herb Mar 28 Apr 4 Jun 3 – Jun 18
Di Cicco Broccoli brassica Mar 21 Apr 4 Jun 8
Drumhead Cabbage brassica Mar 21 Apr 4 Jul 3 – Jul 13
Dukat Dill herb Mar 28 Apr 4 May 14 – May 24
Early Purple Broccoli brassica Mar 21 Apr 4 Jun 8
English Thyme herb Mar 21 Apr 18 Perennial — see plant page
English White Daisy Flowers flower Mar 21 Apr 18 Perennial — see plant page
Evergreen Bunching Onions root vegetable Mar 28 Apr 18 Aug 16
Evergreen Parsley herb Mar 28 Apr 4 Jun 13 – Jun 28
Fenugreek herb Mar 28 Apr 4 May 9 – May 24
Flat-Leaf Parsley herb Mar 14 Apr 18 Jun 27 – Jul 17
Giant Maximum Mix Snapdragon Flowers flower Mar 21 Apr 18 Jul 7 – Jul 22
Giant Musselburgh Leeks allium Mar 14 Apr 4 Jul 13 – Jul 18
Glory of Enkhuizen Cabbage brassica Mar 21 Apr 4 Jul 3
Golden Acre Cabbage brassica Mar 21 Apr 4 Jun 8
Golden Celery vegetable Mar 21 Apr 25 Jul 19 – Jul 29
Grano Red Onions root vegetable Mar 21 Apr 18 Aug 16
Grano White Onions root vegetable Mar 21 Apr 18 Aug 16
Hamburg Rooted Parsley herb Mar 28 Apr 4 Jul 3 – Jul 23
Igloo Cauliflower brassica Mar 21 Apr 4 Jun 8 – Jun 13
Imperial Star Artichoke vegetable Mar 14 Apr 18 Jul 17 – Jul 27
Isis Candy Cherry Tomatoes tomato Mar 28 Apr 25 Jul 4 – Jul 14
Italian Oregano herb Mar 28 Apr 18 Perennial — see plant page
Kellogg's Breakfast tomatoes tomato Mar 28 Apr 25 Jul 9 – Jul 19
Mammoth Dill herb Mar 28 Apr 4 May 19 – Jun 8
Mary Washington Asparagus vegetable Mar 28 Apr 4 Perennial — see plant page
Matt's Wild Cherry Tomatoes tomato Mar 28 Apr 25 Jun 19 – Jun 29
Medium Red Clover Cover Crop cover crop Mar 28 Apr 4 Jun 3 – Jun 18
Millennium Asparagus vegetable Mar 28 Apr 4 Perennial — see plant page
Mrs. Burns Lemon Basil herb Mar 28 Apr 25 Jun 24 – Jul 4
OG American Flag Leeks allium Mar 14 Apr 4 Jul 3 – Jul 13
Ox-Eye Daisy Flowers flower Mar 21 Apr 18 Perennial — see plant page
Paul Robeson tomatoes tomato Mar 28 Apr 25 Jul 4 – Jul 19
Purple Passion Asparagus vegetable Mar 28 Apr 4 Perennial — see plant page
Rapeseed Cover Crop cover crop Mar 28 Apr 4 May 19 – Jun 13
Rapini Broccoli Raab brassica Mar 28 Apr 4 Jun 8
Red Burgundy Onions root vegetable Mar 21 Apr 18 Aug 6 – Aug 16
Roman Chamomile herb Mar 28 Apr 18 Perennial — see plant page
Rue herb Mar 28 Apr 18 Perennial — see plant page
Savoy Perfection Cabbage brassica Mar 21 Apr 4 Jul 3 – Jul 8
Scarlet Flax Flowers flower Mar 28 Apr 4 May 29 – Jun 13
Shasta Daisy Flowers flower Mar 14 Apr 18 Perennial — see plant page
Shungiku (Edible Chrysanthemum) lettuce Mar 28 Apr 4 May 14 – May 29
Snowball Self-Blanche Cauliflower brassica Mar 21 Apr 4 Jun 8
Southport Red Globe Onions root vegetable Mar 21 Apr 18 Aug 16
Southport White Globe Onions root vegetable Mar 21 Apr 18 Aug 16
Spanish Sweet White Onions root vegetable Mar 21 Apr 18 Aug 6 – Aug 16
Sparky Mix Marigolds flower Mar 28 Apr 18 Jun 12 – Jun 27
Sweet Marjoram herb Mar 28 Apr 25 Jul 9 – Jul 24
Sweet Woodruff herb Mar 28 Apr 18 Perennial — see plant page
Tansy herb Mar 28 Apr 18 Perennial — see plant page
Tendercrisp Celery vegetable Mar 21 Apr 25 Jul 19 – Aug 3
Tropical Milkweed Flowers flower Mar 28 Apr 25 Perennial — see plant page
Victoria Rhubarb vegetable Mar 14 Apr 4 Perennial — see plant page
Violetta Purple Cauliflower brassica Mar 21 Apr 4 Jun 8
White Lisbon Bunching Onions root vegetable Mar 28 Apr 18 Jun 22
Wormwood herb Mar 28 Apr 18 Perennial — see plant page
Yellow Sweet Blossom Clover Cover Crop cover crop Mar 28 Apr 4 Jun 3 – Jul 3
Anaheim Peppers pepper Mar 28 May 2 Jul 18 – Jul 26
Bhut Jolokia Ghost Pepper pepper Mar 28 May 2 Jul 31 – Aug 30
Big Jim Hatch Chile pepper Mar 28 May 2 Jul 11 – Jul 16
Broccolini brassica Mar 28 May 2 Jun 21 – Jul 11
Brussels Sprouts brassica Mar 28 May 2 Jul 26 – Aug 20
Caribbean Red Scotch Bonnet Pepper pepper Mar 28 May 2 Aug 5 – Aug 30
Carolina Reaper peppers pepper Mar 21 May 2 Jul 31 – Aug 30
Cayenne Peppers pepper Mar 28 May 2 Jul 26 – Aug 5
Cherry Bomb peppers pepper Mar 21 May 2 Jul 16 – Jul 21
Corno di Toro Pepper pepper Mar 28 May 2 Jul 16 – Jul 21
Datil peppers pepper Mar 21 May 2 Jul 31 – Aug 20
English Lavender herb Mar 28 May 2 Perennial — see plant page
Fresno Peppers pepper Mar 28 May 2 Jul 16 – Jul 21
Green Cabbage brassica Mar 28 May 2 Jul 1 – Aug 10
Green Globe Artichoke vegetable Mar 28 May 2 Perennial — see plant page
Habanero Pepper pepper Mar 28 May 9 Aug 7 – Sep 6
Hungarian Hot Wax Pepper pepper Mar 28 May 2 Jul 6 – Jul 16
Jalapeño Peppers pepper Mar 28 May 2 Jul 6 – Jul 16
Lemongrass herb Mar 28 May 2 Perennial — see plant page
Pinkeye Purple Hull Cowpea legume Mar 7 May 2 Jul 1 – Jul 11
Poblano Peppers pepper Mar 28 May 2 Jul 6 – Jul 16
Red Cabbage brassica Mar 28 May 2 Jul 11 – Aug 20
Romanesco brassica Mar 28 May 2 Jul 16 – Aug 10
Serrano Peppers pepper Mar 28 May 2 Jul 11 – Jul 21
Snow Crown Cauliflower brassica Mar 28 May 2 Jun 21 – Jul 1
Thai Hot Peppers pepper Mar 28 May 2 Jul 16 – Jul 26
Trinidad Moruga Scorpion peppers pepper Mar 21 May 2 Jul 21 – Aug 30
Waltham 29 Broccoli brassica Mar 28 May 2 Jul 16 – Jul 31

Plant Outside in March

Plant Type Action Target Date Harvest Window
Alaska Early Pea legume Transplant Mar 28 May 22 – May 27
Black Salsify root vegetable Transplant Mar 21 Perennial — see plant page
Broad Windsor Fava Bean legume Transplant Mar 28 Jun 11 – Jun 21
Caraway herb Transplant Mar 28 Perennial — see plant page
Cascadia Sugar Snap Pea legume Transplant Mar 28 Jun 1 – Jun 3
Charleston Wakefield Cabbage brassica Transplant Mar 28 Jun 11
Chervil herb Transplant Mar 28 May 2 – May 12
Crimson Cherry Rhubarb Root vegetable Transplant Mar 21 Perennial — see plant page
Dandelion herb Transplant Mar 28 Perennial — see plant page
Delicatesse Blue Kohlrabi brassica Transplant Mar 28 May 22 – May 27
Delicatesse White Kohlrabi brassica Transplant Mar 28 May 22 – May 27
Dutch Yellow Shallots allium Transplant Mar 21 Jun 19 – Jul 19
Early Jersey Wakefield Cabbage brassica Transplant Mar 28 Jun 1 – Jun 11
French Red Shallots allium Transplant Mar 21 Jun 19 – Jul 19
Giant Imperial Mix Larkspur Flowers flower Transplant Mar 28 Jul 6 – Jul 26
Green Arrow Pea legume Transplant Mar 28 Jun 1 – Jun 6
Hard Red Wheat Cover Crop cover crop Transplant Mar 28 Jun 11 – Jul 1
Holland Red Shallots allium Transplant Mar 21 Jun 19 – Jul 19
Little Marvel Pea legume Transplant Mar 28 May 27 – May 30
Mammoth Melting Sugar Snow Pea legume Transplant Mar 28 Jun 4 – Jun 10
Michihili Cabbage brassica Transplant Mar 28 Jun 6
Oregon Giant Snow Pea legume Transplant Mar 28 Jun 6 – Jun 10
Oregon Sugar Pod Snow Pea legume Transplant Mar 28 May 27 – Jun 4
Progress No. 9 Shelling Pea legume Transplant Mar 28 May 25 – May 29
Red Acre Cabbage brassica Transplant Mar 28 Jun 11 – Jun 16
Sugar Ann Snap Pea legume Transplant Mar 28 May 19 – May 23
Tatsoi lettuce Transplant Mar 21 Apr 15 – May 5
Vienna Purple Kohlrabi brassica Transplant Mar 28 May 22 – Jun 1
Vienna White Kohlrabi brassica Transplant Mar 28 Jun 1
Wando Pea legume Transplant Mar 28 May 30 – Jun 4

Harvest in March

No crops entering harvest in March for Zone 6A.

Key Tasks for March in Zone 6A

  1. 1 Start 138 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 Harden off transplants before moving outdoors — set them outside in a sheltered spot for increasing hours over 7–10 days before planting in the ground.
  3. 3 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.
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