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Zone 4B — October

What to Plant in October in Zone 4B

October in Zone 4B: 0 crops to start indoors, 0 to plant or direct sow outside, and 21 entering harvest window. Last frost averages May 11. Reference city: Duluth, MN.
Updated August 12, 2026 · Frost data from NOAA 1991-2020 Climate Normals
0 Start Indoors
0 Plant Outside
21 Harvest
Frost risk: Cleared

Frost season has cleared in Zone 4B. The last spring frost typically passed by May 11, and the very latest 10% chance closed by May 25. Tender crops are safe to plant out.

See full Zone 4B frost outlook →

Start Indoors in October

Nothing to start seeds indoors in October for Zone 4B.
Next window: November — 1 variety, including Garlic.

Plant Outside in October

Nothing to plant or sow outside in October for Zone 4B.
Next window: November — 1 variety, including Garlic.

Harvest in October

Plant Type Planted / Sown Harvest Window
Angelica (fall planting) herb Jul 5 Oct 3
Baby Blue Eyes Flowers (fall planting) flower Jul 5 Oct 3
Brunswick Cabbage (fall planting) brassica Jul 5 Oct 3
Crimson Clover (fall planting) cover crop Jul 5 Oct 3
Flat-Leaf Parsley (fall planting) herb Jul 5 Oct 3
Full Heart Batavian (fall planting) lettuce Jul 5 Oct 3
Giant Maximum Mix Snapdragon Flowers (fall planting) flower Jul 5 Oct 8
Glory of Enkhuizen Cabbage (fall planting) brassica Jul 5 Oct 3
Golden Celery (fall planting) vegetable Jul 5 Oct 8
Hairy vetch cover crop stands (fall planting) cover crop Jul 5 Oct 3
Hard Red Wheat Cover Crop (fall planting) cover crop Jul 5 Oct 8
Harris Model Parsnips (fall planting) root vegetable Jul 5 Oct 3
Napa Cabbage (fall planting) brassica Jul 5 Oct 3
Nodding Catchfly Flowers (fall planting) flower Jul 5 Oct 3
Orion Florence Fennel (fall planting) vegetable Jul 5 Oct 3
Savoy Perfection Cabbage (fall planting) brassica Jul 5 Oct 8
Sweet Marjoram (fall planting) herb Jul 5 Oct 3
Texas Bluebonnet Lupine Flowers (fall planting) flower Jul 5 Oct 8
Verona Red (fall planting) lettuce Jul 5 Oct 5
Waltham 29 Broccoli (fall planting) brassica Jul 5 Oct 3
Yellow Sweet Blossom Clover Cover Crop (fall planting) cover crop Jul 5 Oct 3

Key Tasks for October in Zone 4B

  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.
Back to full Zone 4B planting calendar
September October in Zone 4B November

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