When to Plant Asparagus in Kansas
Published: April 24, 2026
Kansas gardeners in Zone 6b have a 33-week growing season for asparagus (March 22 to November 10). Kansas's spring and fall windows both work well for asparagus — some gardeners plant both successions for a long harvest. This guide gives exact dates for Kansas based on your local frost calendar.
Asparagus Planting Dates for Kansas
| Start seeds indoors | Year-round |
| Last frost (average) | March 22 |
| Direct sow outdoors | February 22–March 4 |
| Expect first harvest | February 22 |
| 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 asparagus crowns in early spring as soon as soil can be worked. Plant once, harvest for 20+ years. Do not harvest first year — allow ferns to establish. Light harvest year 2, full harvest from year 3 onward.
Growing Asparagus in Kansas's Climate
Kansas's moderate Zone 6b climate is well-suited to asparagus 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 asparagus 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 asparagus pests to watch for in Kansas include Asparagus Beetle and Fusarium Wilt. The first line of defense is companion planting: Tomato and Basil 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.
Asparagus Garden Calendar for Kansas
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | Direct sow seeds | Sow seeds 1 inch deep, 18 inches apart |
| March | — | Dormant season |
| April | — | Dormant season |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Dormant season |
| July | — | Dormant season |
| August | — | Dormant season |
| September | — | Dormant season |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining asparagus; cover plants on frost nights |
| December | — | Dormant season |
Asparagus Growing Tips for Kansas Gardeners
- •Plant one-year-old crowns in trenches 6–8 inches deep, spread roots out, and backfill gradually as ferns grow.
- •Never harvest any spears the first year; allow ferns to develop and feed the crown for year-2 production.
- •Kansas's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Cut back dead ferns in late fall and mulch heavily with 4–6 inches of compost or straw before winter.
Companion Planting for Asparagus in Kansas
In Kansas's moderate climate, planting asparagus with Tomato and Basil helps deter pests and improve soil. Avoid planting near Onion and Garlic, which inhibit asparagus growth through root chemistry or shared pest pressure. See the full asparagus companion planting guide for the complete list.
Asparagus 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 asparagus in Kansas?
In Kansas (Zone 6b), start asparagus seeds indoors around Year-round and transplant outdoors around null — 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 asparagus year-round in Kansas?
asparagus 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 asparagus varieties grow best in Kansas?
For Kansas's Zone 6b, consult a local nursery or extension office for asparagus variety recommendations.
When do I start asparagus seeds indoors in Kansas?
Asparagus does not need indoor starting in Kansas — direct sow around February 22–March 4 once soil reaches 50°F. Indoor starting is not recommended for this crop because asparagus transplants poorly.