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Zone 3B — October

What to Plant in October in Zone 3B

October in Zone 3B: 0 crops to start indoors, 11 to plant or direct sow outside, and 5 entering harvest window. Last frost averages May 18. Reference city: International Falls, MN.
Updated August 12, 2026 · Frost data from NOAA 1991-2020 Climate Normals
0 Start Indoors
11 Plant Outside
5 Harvest
Frost risk: Cleared

Frost season has cleared in Zone 3B. The last spring frost typically passed by May 18, and the very latest 10% chance closed by June 1. Tender crops are safe to plant out.

See full Zone 3B frost outlook

Start Indoors in October

Nothing to start seeds indoors in October for Zone 3B.
Next window: February — 2 varieties, including King Richard Leek, Viola and pansy edible flowers.

Plant Outside in October

Plant Type Action Target Date Harvest Window
Asian Tempest Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Chengdu Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Chesnok Red Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Creole Red Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
German Red Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Inchelium Red Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Mild French Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Music Hardneck Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Purple Glazer Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Siberian Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027
Softneck Garlic allium Plant Out Oct 3 Jul 10, 2027 – Jul 31, 2027

Harvest in October

Plant Type Planted / Sown Harvest Window
French Fingerling Potato (fall planting) root vegetable Jun 30 Oct 1
Giant Maximum Mix Snapdragon Flowers (fall planting) flower Jun 30 Oct 3
Hard Red Wheat Cover Crop (fall planting) cover crop Jun 30 Oct 3
Savoy Perfection Cabbage (fall planting) brassica Jun 30 Oct 3
Texas Bluebonnet Lupine Flowers (fall planting) flower Jun 30 Oct 3

Key Tasks for October in Zone 3B

  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 3B planting calendar
September October in Zone 3B March

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