When to Plant Kale in Kansas
Published: April 24, 2026
Kansas gardeners in Zone 6b have a 33-week growing season for kale (March 22 to November 10). Kansas's spring and fall windows both work well for kale — some gardeners plant both successions for a long harvest. This guide gives exact dates for Kansas based on your local frost calendar.
Kale Planting Dates for Kansas
| Start seeds indoors | February 15–22 |
| Last frost (average) | March 22 |
| Transplant outdoors | February 22–March 4 |
| Direct sow outdoors | February 22–March 4 |
| Expect first harvest | April 18 – May 8 |
| Fall crop start | September 15–25 |
| Fall harvest | November 9 |
| First fall frost (average) | November 10 |
Dates above assume Zone 6b, the most common zone in Kansas. Gardeners in cooler Wichita (Zone 6b) plant 1–2 weeks later; warmer Kansas City (Zone 6a) can plant 1–2 weeks earlier.
⚠ Plant kale 3–5 weeks before last frost for spring. Best planted in late summer (6–8 weeks before first fall frost) for fall/winter harvest. Frost sweetens the flavor.
Growing Kale in Kansas's Climate
Kansas's moderate Zone 6b climate is well-suited to kale with minimal special accommodation. The standard transplant calendar works as written, and harvest windows line up with what seed packets recommend without adjustment.
Succession planting extends your kale harvest significantly in Kansas. A second planting 3 to 4 weeks after the first gives you a backup in case of pest pressure and extends the total harvest window into early fall.
Common kale pests to watch for in Kansas include Cabbage Worm and Cabbage Looper. The first line of defense is companion planting: Onion and Garlic planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Kale Garden Calendar for Kansas
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | Transplant outdoors | Soil temp must be 40°F+; nighttime lows above 50°F |
| March | Harden off seedlings | Set seedlings outdoors 1–2 hours daily, increasing gradually |
| April | First harvest window opens | Kale begins producing 55–75 days after transplant |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Dormant season |
| July | — | Dormant season |
| August | — | Dormant season |
| September | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining kale; cover plants on frost nights |
| December | — | Dormant season |
Kale Growing Tips for Kansas Gardeners
- •Harvest outer leaves first using the cut-and-come-again method; the central growing point will produce for months.
- •Kale leaves become sweeter after the first frost as plants convert starches to sugars — wait for cold nights for best flavor.
- •Kansas's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Use floating row covers to block cabbage white butterflies from laying eggs on plants.
Companion Planting for Kale in Kansas
In Kansas's moderate climate, planting kale with Onion and Garlic helps deter pests and improve soil. Avoid planting near Tomato and Strawberry, which inhibit kale growth through root chemistry or shared pest pressure. See the full kale companion planting guide for the complete list.
Kale Planting Dates by City in Kansas
Top cities in Kansas — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant kale in Kansas?
In Kansas (Zone 6b), start kale seeds indoors around February 15–22 and transplant outdoors around February 22–March 4 — 4 weeks before the state's average last frost of March 22.
What is the last frost date in Kansas?
Kansas's average last frost date is March 22 in the state's most common Zone 6b. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow kale year-round in Kansas?
kale is a cool-season crop in Kansas, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What kale varieties grow best in Kansas?
For Kansas's Zone 6b, consult a local nursery or extension office for kale variety recommendations.
When do I start kale seeds indoors in Kansas?
Start kale seeds indoors in Kansas around February 15–22, which is 5 weeks before the state's average last frost of March 22. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.