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Zone 5B — September

What to Plant in September in Zone 5B

September in Zone 5B: 0 crops to start indoors, 0 to plant or direct sow outside, and 109 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
0 Plant Outside
109 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: January — 1 variety, including Green Onion.

Plant Outside in September

Nothing to plant or sow outside in September for Zone 5B.
Next window: October — 12 varieties, including Asian Tempest Garlic, Chengdu Garlic, Chesnok Red Garlic.

Harvest in September

Plant Type Planted / Sown Harvest Window
Big Max Pumpkin squash May 11 Sep 3 – Sep 8
Chayote squash vegetable May 18 Sep 15 – Oct 2 (before frost)
Cinderella Pumpkin squash May 11 Sep 3
Grano Red Onions allium May 4 Sep 1
Grano White Onions allium May 4 Sep 1
Harris Model Parsnips root vegetable May 11 Sep 3 – Sep 8
Indian Spring Mix Hollyhock Flowers flower May 4 Sep 1 – Oct 2 (before frost)
Mammoth Sandwich Island Salsify root vegetable May 11 Sep 8
Pacific Giant Pumpkin squash May 11 Sep 3 – Sep 13
Southport Red Globe Onions allium May 4 Sep 1
Southport White Globe Onions allium 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 27
America Spinach (fall planting) lettuce Aug 1 Sep 25
Astro Arugula (fall planting) lettuce Aug 1 Sep 10
Beauty White Radishes (fall planting) root vegetable Aug 1 Sep 10
Black Seeded Simpson Lettuce (fall planting) lettuce Aug 1 Sep 16
Blonde de Paris Lettuce (fall planting) lettuce Aug 1 Sep 30
Bloomsdale Longstanding Spinach (fall planting) lettuce Aug 1 Sep 22
Blue Curled Scotch Kale (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 Endive (fall planting) lettuce Aug 1 Sep 30
Broccolini (fall planting) brassica Aug 1 Sep 30
Bull's Blood Beets (fall planting) root vegetable Aug 1 Sep 25
Burgundy Boston Lettuce (fall planting) lettuce Aug 1 Sep 25
Buttercrunch Lettuce (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 Swiss Chard (fall planting) lettuce Aug 1 Sep 30
Cascadia Sugar Snap Pea (fall planting) legume Aug 1 Sep 30
Catalogna Chicory (fall planting) lettuce Aug 1 Sep 25
Chervil (fall planting) herb Aug 1 Sep 15
Chinese Broccoli (Gai Lan) (fall planting) brassica Aug 1 Sep 20
Chioggia Beet (fall planting) root vegetable Aug 1 Sep 25
Crimson Forest Bunching Onions (fall planting) allium 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
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
Di Cicco Broccoli (fall planting) brassica Aug 1 Sep 18
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
Dwarf Siberian Kale (fall planting) lettuce Aug 1 Sep 25
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 25
Fenugreek (fall planting) herb Aug 1 Sep 20
Florida Broadleaf Mustard (fall planting) lettuce Aug 1 Sep 20
Fordhook Giant Swiss Chard (fall planting) lettuce Aug 1 Sep 25
French Lamb's Lettuce (fall planting) lettuce Aug 1 Sep 20
Giant Red Mustard (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 Lettuce (fall planting) lettuce Aug 1 Sep 15
Green Mountain Celtuce (fall planting) lettuce Aug 1 Sep 20
Green Wave Mustard (fall planting) lettuce Aug 1 Sep 15
Hot Pink Swiss Chard (fall planting) lettuce Aug 1 Sep 30
Kagraner Sommer Lettuce (fall planting) lettuce Aug 1 Sep 28
Lacy Phacelia Flowers (fall planting) flower Aug 1 Sep 30
Leaf Lettuce Mix (fall planting) lettuce Aug 1 Sep 25
Little Fingers Carrots (fall planting) root vegetable Aug 1 Sep 25
Little Gem Lettuce (fall planting) lettuce Aug 1 Sep 26
Lollo Bionda Lettuce (fall planting) lettuce Aug 1 Sep 30
Lollo Rossa Lettuce (fall planting) lettuce Aug 1 Sep 26
Lunar White Carrots (fall planting) root vegetable Aug 1 Sep 30
Magenta Sunset Swiss Chard (fall planting) lettuce Aug 1 Sep 30
Marvel of Four Seasons Lettuce (fall planting) lettuce Aug 1 Sep 30
Matador Viking Spinach (fall planting) lettuce Aug 1 Sep 18
Minowase Daikon Radish (fall planting) root vegetable Aug 1 Sep 25
Mizuna (fall planting) lettuce Aug 1 Sep 20
Monstrueux de Viroflay Spinach (fall planting) lettuce Aug 1 Sep 20
Mustard Greens (fall planting) lettuce Aug 1 Sep 20
Noble Giant Spinach (fall planting) lettuce Aug 1 Sep 20
Old Fashion Mustard (fall planting) lettuce Aug 1 Sep 20
Orange Swiss Chard (fall planting) lettuce Aug 1 Sep 25
Oregon Giant Snow Pea (fall planting) legume Aug 1 Sep 30
Phacelia cover crop and bee forage (fall planting) cover crop Aug 1 Sep 30
Premier Kale (fall planting) lettuce Aug 1 Sep 30
Purple Top White Globe Turnip (fall planting) root vegetable Aug 1 Sep 20
Rainbow Mix Swiss Chard (fall planting) lettuce Aug 1 Sep 30
Red Leaf Lettuce (fall planting) lettuce Aug 1 Sep 25
Red Orach (fall planting) lettuce Aug 1 Sep 15
Red Russian Kale (fall planting) lettuce Aug 1 Sep 20
Royal Carpet Alyssum Flowers (fall planting) flower Aug 1 Sep 30
Ruby Red Swiss Chard (fall planting) lettuce Aug 1 Sep 30
Salad Bowl Green Lettuce (fall planting) lettuce Aug 1 Sep 20
Shungiku (Edible Chrysanthemum) (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 25
Summer Bibb Lettuce (fall planting) lettuce Aug 1 Sep 30
Swiss Chard (fall planting) lettuce Aug 1 Sep 30
Tango Lettuce (fall planting) lettuce Aug 1 Sep 16
Tatsoi (fall planting) lettuce Aug 1 Sep 15
Tendergreen Mustard (fall planting) lettuce Aug 1 Sep 20
Très Fine Maraîchère Frisée (fall planting) lettuce Aug 1 Sep 30
Vates Kale (fall planting) lettuce Aug 1 Sep 25
Vienna White Kohlrabi (fall planting) brassica Aug 1 Sep 25
White Boston Lettuce (fall planting) lettuce Aug 1 Sep 20
White Detroit Beets (fall planting) root vegetable Aug 1 Sep 30
White Lisbon Bunching Onions (fall planting) allium Aug 1 Sep 30
Winner Kohlrabi (fall planting) brassica Aug 1 Sep 20
Winter Density Lettuce (fall planting) lettuce Aug 1 Sep 30
Winter Giant Spinach (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
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