When to Plant Cauliflower in Kansas
Published: April 24, 2026
Kansas gardeners in Zone 6b have a 33-week growing season for cauliflower (March 22 to November 10). Kansas's spring and fall windows both work well for cauliflower — some gardeners plant both successions for a long harvest. This guide gives exact dates for Kansas based on your local frost calendar.
Cauliflower Planting Dates for Kansas
| Start seeds indoors | February 15–22 |
| Last frost (average) | March 22 |
| Transplant outdoors | March 1–11 |
| Expect first harvest | April 25 – June 9 |
| Fall crop start | September 1–11 |
| Fall harvest | October 26 |
| 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.
⚠ Start cauliflower indoors 4–6 weeks before last frost. Transplant 2–4 weeks before last frost. Needs consistent moisture and cool temps — bolts in heat above 75°F.
Growing Cauliflower in Kansas's Climate
Kansas's moderate Zone 6b climate is well-suited to cauliflower 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 cauliflower 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 cauliflower pests to watch for in Kansas include Cabbage Worm and Cabbage Looper. The first line of defense is companion planting: Onion and Celery 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.
Cauliflower Garden Calendar for Kansas
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| March | Transplant outdoors | Soil temp must be 45°F+; nighttime lows above 50°F |
| April | First harvest window opens | Cauliflower begins producing 55–100 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 cauliflower; cover plants on frost nights |
| December | — | Dormant season |
Cauliflower Growing Tips for Kansas Gardeners
- •Blanch white varieties by tying outer leaves over the head when it reaches egg-size — prevents yellowing from sun exposure.
- •Keep soil evenly moist — drought stress causes small, bitter 'buttoning' heads instead of full curds.
- •Kansas's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Plant fall crops in mid-July to mid-August for October harvest; fall cauliflower is usually larger and sweeter than spring.
Companion Planting for Cauliflower in Kansas
In Kansas's moderate climate, planting cauliflower with Onion and Celery helps deter pests and improve soil. Avoid planting near Tomato and Strawberry, which inhibit cauliflower growth through root chemistry or shared pest pressure. See the full cauliflower companion planting guide for the complete list.
Cauliflower 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 cauliflower in Kansas?
In Kansas (Zone 6b), start cauliflower seeds indoors around February 15–22 and transplant outdoors around March 1–11 — 3 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 cauliflower year-round in Kansas?
cauliflower 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 cauliflower varieties grow best in Kansas?
For Kansas's Zone 6b, consult a local nursery or extension office for cauliflower variety recommendations.
When do I start cauliflower seeds indoors in Kansas?
Start cauliflower 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.