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Zone 3A — September

What to Plant in September in Zone 3A

September in Zone 3A: 0 crops to start indoors, 0 to plant or direct sow outside, and 57 entering harvest window. Last frost averages May 22. Reference city: Tower, MN.
Updated August 12, 2026 · Frost data from NOAA 1991-2020 Climate Normals
0 Start Indoors
0 Plant Outside
57 Harvest
Frost risk: Cleared

Frost season has cleared in Zone 3A. The last spring frost typically passed by May 22, and the very latest 10% chance closed by June 7. Tender crops are safe to plant out.

See full Zone 3A frost outlook →

Start Indoors in September

Nothing to start seeds indoors in September for Zone 3A.
Next window: November — 1 variety, including Garlic.

Plant Outside in September

Nothing to plant or sow outside in September for Zone 3A.
Next window: November — 1 variety, including Garlic.

Harvest in September

Plant Type Planted / Sown Harvest Window
Carolina Cross Watermelon melon May 29 Sep 1
Indian Spring Mix Hollyhock Flowers flower May 22 Sep 19 – Nov 18
Summer Carnival Mix Hollyhock Flowers flower May 22 Sep 19 – Nov 18
All Season Cabbage (fall planting) brassica Jun 25 Sep 13
All Year Round (fall planting) lettuce Jun 25 Sep 6
Angelica (fall planting) herb Jun 25 Sep 23
Baby Blue Eyes Flowers (fall planting) flower Jun 25 Sep 23
Bachelor's button edible flowers (fall planting) flower Jun 25 Sep 13
Broad Windsor Fava Bean (fall planting) legume Jun 25 Sep 18
Broccolini (fall planting) brassica Jun 25 Sep 3
Brunswick Cabbage (fall planting) brassica Jun 25 Sep 23
Charleston Wakefield Cabbage (fall planting) brassica Jun 25 Sep 8
Cosmic Purple Carrot (fall planting) root vegetable Jun 25 Sep 8
Crimson Clover (fall planting) cover crop Jun 25 Sep 23
Crisphead (fall planting) lettuce Jun 25 Sep 8
Danvers Carrot (fall planting) root vegetable Jun 25 Sep 13
Dark Green Romaine (fall planting) lettuce Jun 25 Sep 3
Early Jersey Wakefield Cabbage (fall planting) brassica Jun 25 Sep 8
Evergreen Parsley (fall planting) herb Jun 25 Sep 18
Full Heart Batavian (fall planting) lettuce Jun 25 Sep 23
Georgia Southern Collard Greens (fall planting) lettuce Jun 25 Sep 13
Globe Gilia Flowers (fall planting) flower Jun 25 Sep 13
Glory of Enkhuizen Cabbage (fall planting) brassica Jun 25 Sep 23
Green Arrow Pea (fall planting) legume Jun 25 Sep 3
Hairy vetch cover crop stands (fall planting) cover crop Jun 25 Sep 23
Iceberg (fall planting) lettuce Jun 25 Sep 8
Igloo Cauliflower (fall planting) brassica Jun 25 Sep 3
Lacy Phacelia Flowers (fall planting) flower Jun 25 Sep 8
Love-in-a-Mist Flowers (fall planting) flower Jun 25 Sep 18
Mammoth Melting Sugar Snow Pea (fall planting) legume Jun 25 Sep 7
Medium Red Clover Cover Crop (fall planting) cover crop Jun 25 Sep 8
Michihili Cabbage (fall planting) brassica Jun 25 Sep 3
Morris Heading (fall planting) lettuce Jun 25 Sep 13
Mâche (Corn Salad) (fall planting) lettuce Jun 25 Sep 17
Nantes Carrot (fall planting) root vegetable Jun 29 Sep 12
Napa Cabbage (fall planting) brassica Jun 25 Sep 23
Nodding Catchfly Flowers (fall planting) flower Jun 25 Sep 23
Oregon Giant Snow Pea (fall planting) legume Jun 25 Sep 7
Oregon Sugar Pod Snow Pea (fall planting) legume Jun 25 Sep 1
Orion Florence Fennel (fall planting) vegetable Jun 25 Sep 23
Radicchio (fall planting) lettuce Jun 25 Sep 18
Rapeseed Cover Crop (fall planting) cover crop Jun 25 Sep 3
Red Acre Cabbage (fall planting) brassica Jun 25 Sep 13
Red Romaine (fall planting) lettuce Jun 25 Sep 3
Romaine Lettuce (fall planting) lettuce Jun 25 Sep 8
Scarlet Flax Flowers (fall planting) flower Jun 25 Sep 3
Shelling Pea (fall planting) legume Jun 25 Sep 3
Snow Pea (fall planting) legume Jun 25 Sep 3
Sweet Marjoram (fall planting) herb Jun 25 Sep 23
Tom Thumb (fall planting) lettuce Jun 25 Sep 3
Tuscany Black (fall planting) lettuce Jun 25 Sep 8
Vates Collard (fall planting) lettuce Jun 25 Sep 8
Verona Red (fall planting) lettuce Jun 25 Sep 25
Viola and pansy edible flowers (fall planting) flower Jun 25 Sep 3
Waltham 29 Broccoli (fall planting) brassica Jun 25 Sep 23
Wando Pea (fall planting) legume Jun 25 Sep 1
Sugar Snap Pea (fall planting) legume Jul 13 Sep 21

Key Tasks for September in Zone 3A

  1. 1 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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