Skip to main content
Zone 5B — September

What to Plant in September in Zone 5B

September in Zone 5B: 0 crops to start indoors, 2 to plant or direct sow outside, and 98 entering harvest window. Last frost averages May 4. Reference city: Kansas City, MO.
Updated May 13, 2026 · Frost data from NOAA 1991-2020 Climate Normals
0 Start Indoors
2 Plant Outside
98 Harvest
Frost risk: Cleared

Frost season has cleared in Zone 5B. The last spring frost typically passed by May 4, and the very latest 10% chance closed by May 18. Tender crops are safe to plant out.

See full Zone 5B frost outlook →

Start Indoors in September

Nothing to start seeds indoors in September for Zone 5B.
Next window: October — 1 variety, including Garlic.

Plant Outside in September

Plant Type Action Target Date Harvest Window
Elephant Garlic root vegetable Plant Out Sep 11 Mar 10, 2027 – May 9, 2027
Softneck Garlic root vegetable Plant Out Sep 11 May 9, 2027 – Jun 8, 2027

Harvest in September

Plant Type Planted / Sown Harvest Window
Atlantic Giant Pumpkin squash May 11 Sep 8
Big Max Pumpkin squash May 11 Sep 3 – Sep 8
Chayote squash vegetable May 18 Sep 15 – Oct 2 (before frost)
Evergreen Bunching Onions root vegetable May 4 Sep 1
Grano Red Onions root vegetable May 4 Sep 1
Grano White Onions root vegetable May 4 Sep 1
Indian Spring Mix Hollyhock Flowers flower May 4 Sep 1 – Oct 2 (before frost)
Pacific Giant Pumpkin squash May 11 Sep 3 – Sep 13
Southport Red Globe Onions root vegetable May 4 Sep 1
Southport White Globe Onions root vegetable May 4 Sep 1
Summer Carnival Mix Hollyhock Flowers flower May 4 Sep 1 – Oct 2 (before frost)
Tepin Hot Peppers pepper May 18 Sep 15 – Oct 2 (before frost)
Nantes Carrot (fall planting) root vegetable Jul 17 Sep 30
Alaska Early Pea (fall planting) legume Aug 1 Sep 30
America (fall planting) lettuce Aug 1 Sep 25
Astro Arugula (fall planting) lettuce Aug 1 Sep 10
Black Seeded Simpson (fall planting) lettuce Aug 1 Sep 16
Blonde de Paris (fall planting) lettuce Aug 1 Sep 30
Bloomsdale Longstanding Spinach (fall planting) lettuce Aug 1 Sep 22
Blue Curled Scotch (fall planting) lettuce Aug 1 Sep 30
Bok Choy (fall planting) lettuce Aug 1 Sep 30
Boltardy Beets (fall planting) root vegetable Aug 1 Sep 30
Broadleaf Classic (fall planting) lettuce Aug 1 Sep 30
Bull's Blood Beets (fall planting) root vegetable Aug 1 Sep 25
Burgundy Boston (fall planting) lettuce Aug 1 Sep 25
Buttercrunch (fall planting) lettuce Aug 1 Sep 25
Calendula (fall planting) flower Aug 1 Sep 30
Calypso Cilantro (fall planting) herb Aug 1 Sep 25
Canary Yellow (fall planting) lettuce Aug 1 Sep 30
Chervil (fall planting) herb Aug 1 Sep 15
Chinese Broccoli (Gai Lan) (fall planting) brassica Aug 1 Sep 20
Crimson Forest Bunching Onions (fall planting) root vegetable Aug 1 Sep 30
Crosby's Egyptian Beets (fall planting) root vegetable Aug 1 Sep 30
Cylindra Beets (fall planting) root vegetable Aug 1 Sep 30
Daikon Radishes (fall planting) root vegetable Aug 1 Sep 25
Delicatesse Blue Kohlrabi (fall planting) brassica Aug 1 Sep 30
Delicatesse White Kohlrabi (fall planting) brassica Aug 1 Sep 30
Detroit Dark Red Beet (fall planting) root vegetable Aug 1 Sep 30
Dill (fall planting) herb Aug 1 Sep 25
Dukat Dill (fall planting) herb Aug 1 Sep 20
Dutch Lamb's Lettuce (fall planting) lettuce Aug 1 Sep 20
Early Wonder Beets (fall planting) root vegetable Aug 1 Sep 20
Easter Egg Radishes (fall planting) root vegetable Aug 1 Sep 2
Fairy Dwarf Mix Candytuft Flowers (fall planting) flower Aug 1 Sep 30
Fenugreek (fall planting) herb Aug 1 Sep 20
Florida Broadleaf (fall planting) lettuce Aug 1 Sep 20
Fordhook Giant (fall planting) lettuce Aug 1 Sep 25
French Lamb's Lettuce (fall planting) lettuce Aug 1 Sep 20
Giant Red (fall planting) lettuce Aug 1 Sep 15
Golden Detroit Beets (fall planting) root vegetable Aug 1 Sep 30
Golden Globe Turnips (fall planting) root vegetable Aug 1 Sep 20
Green Ice (fall planting) lettuce Aug 1 Sep 15
Green Wave (fall planting) lettuce Aug 1 Sep 15
Hot Pink (fall planting) lettuce Aug 1 Sep 30
Kagraner Sommer (fall planting) lettuce Aug 1 Sep 28
Leaf Lettuce Mix (fall planting) lettuce Aug 1 Sep 25
Little Fingers Carrots (fall planting) root vegetable Aug 1 Sep 25
Little Gem (fall planting) lettuce Aug 1 Sep 26
Lollo Bionda (fall planting) lettuce Aug 1 Sep 30
Lollo Rossa (fall planting) lettuce Aug 1 Sep 26
Magenta Sunset (fall planting) lettuce Aug 1 Sep 30
Marvel of Four Seasons (fall planting) lettuce Aug 1 Sep 30
Matador Viking (fall planting) lettuce Aug 1 Sep 18
Mizuna (fall planting) lettuce Aug 1 Sep 20
Monstrueux de Viroflay (fall planting) lettuce Aug 1 Sep 20
Mustard Greens (fall planting) lettuce Aug 1 Sep 20
New Zealand Spinach (fall planting) lettuce Aug 1 Sep 30
Noble Giant (fall planting) lettuce Aug 1 Sep 20
Old Fashion (fall planting) lettuce Aug 1 Sep 20
Orange (fall planting) lettuce Aug 1 Sep 25
Paris Market Carrots (fall planting) root vegetable Aug 1 Sep 25
Phacelia cover crop and bee forage (fall planting) cover crop Aug 1 Sep 30
Premier (fall planting) lettuce Aug 1 Sep 30
Rainbow Mix (fall planting) lettuce Aug 1 Sep 30
Red Leaf Lettuce (fall planting) lettuce Aug 1 Sep 25
Red Russian Kale (fall planting) lettuce Aug 1 Sep 30
Royal Carpet Alyssum Flowers (fall planting) flower Aug 1 Sep 30
Ruby Red (fall planting) lettuce Aug 1 Sep 30
Salad Bowl Green (fall planting) lettuce Aug 1 Sep 20
Shungiku (Edible Chrysanthemum) (fall planting) lettuce Aug 1 Sep 25
Siberian Dwarf (fall planting) lettuce Aug 1 Sep 25
Slow-Bolt (Slo-Bolt) Cilantro/Coriander (fall planting) herb Aug 1 Sep 10
Snow Crown Cauliflower (fall planting) brassica Aug 1 Sep 30
Sugar Ann Snap Pea (fall planting) legume Aug 1 Sep 26
Summer Bibb (fall planting) lettuce Aug 1 Sep 30
Swiss Chard (fall planting) lettuce Aug 1 Sep 30
Tango (fall planting) lettuce Aug 1 Sep 10
Tatsoi (fall planting) lettuce Aug 1 Sep 15
Tendergreen (fall planting) lettuce Aug 1 Sep 20
Turnip (fall planting) root vegetable Aug 1 Sep 30
Vates Kale (fall planting) lettuce Aug 1 Sep 25
Vietnamese Coriander (fall planting) herb Aug 1 Sep 30
White Boston (fall planting) lettuce Aug 1 Sep 20
White Detroit Beets (fall planting) root vegetable Aug 1 Sep 30
White Icicle Radishes (fall planting) root vegetable Aug 1 Sep 10
Winner Kohlrabi (fall planting) brassica Aug 1 Sep 20
Winter Density (fall planting) lettuce Aug 1 Sep 30
Winter Giant (fall planting) lettuce Aug 1 Sep 20

Key Tasks for September in Zone 5B

  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 5B planting calendar
August September in Zone 5B October

Get a Personalized September Calendar

SoilStack builds your exact planting schedule from your ZIP code — day-by-day tasks, weather prompts, and harvest tracking included.

Start Your Free Garden Calendar