When to Plant Asparagus in Oklahoma
Published: April 24, 2026
Oklahoma gardeners in Zone 7a have a 35-week growing season for asparagus (March 15 to November 15). Oklahoma'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 Oklahoma based on your local frost calendar.
Asparagus Planting Dates for Oklahoma
| Start seeds indoors | Year-round |
| Last frost (average) | March 15 |
| Direct sow outdoors | February 15–25 |
| Expect first harvest | February 15 |
| First fall frost (average) | November 15 |
⚠ 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 Oklahoma's Climate
Oklahoma's moderate Zone 7a 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 Oklahoma. 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 Oklahoma 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 Oklahoma
| 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 Oklahoma 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.
- •Oklahoma'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 Oklahoma
In Oklahoma'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 Oklahoma
Top cities in Oklahoma — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant asparagus in Oklahoma?
In Oklahoma (Zone 7a), start asparagus seeds indoors around Year-round and transplant outdoors around null — 4 weeks before the state's average last frost of March 15.
What is the last frost date in Oklahoma?
Oklahoma's average last frost date is March 15 in the state's most common Zone 7a. 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 Oklahoma?
asparagus is a cool-season crop in Oklahoma, 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 Oklahoma?
For Oklahoma's Zone 7a, consult a local nursery or extension office for asparagus variety recommendations.
When do I start asparagus seeds indoors in Oklahoma?
Asparagus does not need indoor starting in Oklahoma — direct sow around February 15–25 once soil reaches 50°F. Indoor starting is not recommended for this crop because asparagus transplants poorly.