What to Plant in September in Utah

Your September planting guide for Utah (USDA Zones 4–9, typically Zone 5). We've broken out activities by zone — jump to yours below.

Growing season varies across Zones 4–9 — 135–290 days. Pick the zone that matches your part of the state.

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Start Indoors

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Transplant Outdoors

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Direct Sow

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1005

Harvest

Utah · Zones 4–9

Zone 5 September guide

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

← Aug

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

Oct →

Zone 5 — September in Utah★ Most of UT

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

🏠 Indoor 57🧺 Harvest 963

Full Zone 5 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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+ 955 more Zone 5 varieties for September →

Zone 4 — September in Utah

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

🏠 Indoor 57🧺 Harvest 913

Full Zone 4 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

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+ 905 more Zone 4 varieties for September →

Zone 6 — September in Utah

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

🏠 Indoor 57🧺 Harvest 978

Full Zone 6 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

🧺

+ 970 more Zone 6 varieties for September →

Zone 7 — September in Utah

903 varieties active · Last frost April 1 · 210-day season

🏠 Indoor 57🧺 Harvest 903

Full Zone 7 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

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+ 895 more Zone 7 varieties for September →

Zone 8 — September in Utah

780 varieties active · Last frost March 15 · 240-day season

🏠 Indoor 57🧺 Harvest 780

Full Zone 8 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

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+ 772 more Zone 8 varieties for September →

Zone 9 — September in Utah

535 varieties active · Last frost February 15 · 290-day season

🏠 Indoor 57🧺 Harvest 535

Full Zone 9 guide →

Ailsa Craig Onion

Root Vegetables · 110d

🧺

Ailsa Craig Sweet Onion

Alliums · 110-120d

🧺

Albion

Root Vegetables · 120d

🧺

Alderman

Peas · 70-80d

🧺

Alexandria

Berries & Fruits · 100-120d

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Alfalfa Microgreens

Microgreens · 6-10d

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Ali Baba Watermelon

Melons · 100-110d

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All Seasons White Daikon

Root Vegetables · 60-70d

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+ 527 more Zone 9 varieties for September →

What to Plant in September in Utah

Utah · Zones 4–9

Zone 5 — September in Utah★ Most of UT

Zone 4 — September in Utah

Zone 6 — September in Utah

Zone 7 — September in Utah

Zone 8 — September in Utah

Zone 9 — September in Utah

September in Regions Overlapping Zones 4–9

September by Zone

Utah Monthly Guides