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Zone 6A — March

What to Plant in March in Zone 6A

March in Zone 6A: 138 crops to start indoors, 31 to plant or direct sow outside, and 3 entering harvest window. Last frost averages April 18. Reference city: Columbus, OH.
Updated May 14, 2026 · Frost data from NOAA 1991-2020 Climate Normals
138 Start Indoors
31 Plant Outside
3 Harvest

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 Jul 9 – Jul 24
Broad Windsor Fava Bean legume Mar 21 Mar 28 Jun 11 – Jun 21
Caraway herb Mar 21 Mar 28 Mar 28 – Jun 1
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 Mar 21 – Mar 20
Dandelion herb Mar 21 Mar 28 May 7 – May 27
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 Aug 3 – Aug 23
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 Aug 16 – Sep 15
Baby's Breath Flowers flower Mar 28 Apr 18 Aug 16 – Sep 15
Barletta, Pearly White Onions root_vegetable Mar 21 Apr 18 Jul 2 – Jul 7
Blue Flax Flowers flower Mar 28 Apr 4 Jul 3 – Aug 2
Bouquet Dill herb Mar 28 Apr 4 May 24 – Jun 8
Brilliant Celeriac root_vegetable Mar 7 Apr 18 Aug 6 – Aug 16
Broadleaf Sage Herb herb Mar 28 Apr 25 Jul 9
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 Aug 23 – Oct 22
Carentan Leeks allium Mar 14 Apr 4 Jul 3 – Jul 23
Catmint herb Mar 28 Apr 18 Jul 17 – Aug 16
Chinese Forget-Me-Not Flowers flower Mar 28 Apr 4 Jun 8 – Jun 28
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 White Daisy Flowers flower Mar 21 Apr 18 Aug 16 – Sep 15
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 Jul 17 – Jul 27
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 Apr 3
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 Apr 4 – Apr 3
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 Apr 18 – Aug 31
Paul Robeson tomatoes tomato Mar 28 Apr 25 Jul 4 – Jul 19
Purple Passion Asparagus vegetable Mar 28 Apr 4 Apr 4 – Apr 3
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 Jul 17 – Aug 16
Rue herb Mar 28 Apr 18 Jul 22 – Aug 21
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 Aug 16 – Apr 18
Shungiku (Edible Chrysanthemum) vegetable 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 Jun 27 – Jul 17
Tansy herb Mar 28 Apr 18 Jul 27 – Aug 26
Tendercrisp Celery vegetable Mar 21 Apr 25 Jul 19 – Aug 3
Thyme herb Mar 21 Apr 18 Jul 7 – Jul 22
Tropical Milkweed Flowers flower Mar 28 Apr 25 Jul 24 – Aug 23
Victoria Rhubarb vegetable Mar 14 Apr 4 Apr 3
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 Jul 27 – Aug 26
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 herb Mar 28 May 2 Jul 26
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 May 2 – May 1
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 herb Mar 28 May 2 Jul 21 – Aug 10
Pinkeye Purple Hull Cowpea legume Mar 7 May 2 Jun 26 – Jul 9
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 Jul 9 – Jul 24
Broad Windsor Fava Bean legume Transplant Mar 28 Jun 11 – Jun 21
Caraway herb Transplant Mar 28 Mar 28 – Jun 1
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 Mar 21 – Mar 20
Dandelion herb Transplant Mar 28 May 7 – May 27
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
Texas 1015Y SuperSweet Onion root_vegetable Transplant Mar 21 Jul 4 – Jul 14
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

Plant Type Planted / Sown Harvest Window
Caraway herb Mar 28 Mar 28 – Jun 1
Crimson Cherry Rhubarb Root vegetable Mar 21 Mar 21 – Mar 20
Jewel Strawberries berry Apr 18 Mar 14 – May 23

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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