What to Plant in October in Montana

Your October planting guide for Montana (USDA Zones 3–6, typically Zone 4). We've broken out activities by zone — jump to yours below.

Growing season varies across Zones 3–6 — 120–180 days. Pick the zone that matches your part of the state.

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Start Indoors

🌿

Transplant Outdoors

🌱

Direct Sow

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985

Harvest

Montana · Zones 3–6

Zone 4 October guide

Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8 Zone 9 Zone 10

← Sep

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Nov →

Zone 4 — October in Montana★ Most of MT

883 varieties active · Last frost May 10 · 135-day season

🏠 Indoor 57🧺 Harvest 883

Full Zone 4 guide →

Ace 55

Tomatoes · 80-85d

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Ace 56

Tomatoes · 70-75d

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Acorn Squash (Table Queen)

Squash & Cucumbers · 85-100d

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Affirmed

Beans & Legumes · 56d

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Ailsa Craig Onion

Root Vegetables · 110d

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Ailsa Craig Sweet Onion

Alliums · 110-120d

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Aji Dulce 'Venezuelan Sweet'

Peppers · 85-95d

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Albion

Root Vegetables · 120d

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+ 875 more Zone 4 varieties for October →

Zone 3 — October in Montana

879 varieties active · Last frost May 15 · 120-day season

🏠 Indoor 57🧺 Harvest 879

Full Zone 3 guide →

Ace 55

Tomatoes · 80-85d

🧺

Ace 56

Tomatoes · 70-75d

🧺

Acorn Squash (Table Queen)

Squash & Cucumbers · 85-100d

🧺

Affirmed

Beans & Legumes · 56d

🧺

Ailsa Craig Onion

Root Vegetables · 110d

🧺

Ailsa Craig Sweet Onion

Alliums · 110-120d

🧺

Aji Dulce 'Venezuelan Sweet'

Peppers · 85-95d

🧺

Albion

Root Vegetables · 120d

🧺

+ 871 more Zone 3 varieties for October →

Zone 5 — October in Montana

870 varieties active · Last frost April 30 · 155-day season

🏠 Indoor 57🧺 Harvest 870

Full Zone 5 guide →

Ace 55

Tomatoes · 80-85d

🧺

Ace 56

Tomatoes · 70-75d

🧺

Acorn Squash (Table Queen)

Squash & Cucumbers · 85-100d

🧺

Ailsa Craig Onion

Root Vegetables · 110d

🧺

Ailsa Craig Sweet Onion

Alliums · 110-120d

🧺

Aji Dulce 'Venezuelan Sweet'

Peppers · 85-95d

🧺

Albion

Root Vegetables · 120d

🧺

Alderman

Peas · 70-80d

🧺

+ 862 more Zone 5 varieties for October →

Zone 6 — October in Montana

784 varieties active · Last frost April 15 · 180-day season

🏠 Indoor 57🧺 Harvest 784

Full Zone 6 guide →

Ace 55

Tomatoes · 80-85d

🧺

Acorn Squash (Table Queen)

Squash & Cucumbers · 85-100d

🧺

Ailsa Craig Onion

Root Vegetables · 110d

🧺

Ailsa Craig Sweet Onion

Alliums · 110-120d

🧺

Aji Dulce 'Venezuelan Sweet'

Peppers · 85-95d

🧺

Albion

Root Vegetables · 120d

🧺

Alderman

Peas · 70-80d

🧺

Alexandria

Berries & Fruits · 100-120d

🧺

+ 776 more Zone 6 varieties for October →

What to Plant in October in Montana

Montana · Zones 3–6

Zone 4 — October in Montana★ Most of MT

Zone 3 — October in Montana

Zone 5 — October in Montana

Zone 6 — October in Montana

October in Regions Overlapping Zones 3–6

October by Zone

Montana Monthly Guides