When to Plant Lettuce in Oklahoma
Published: April 21, 2026
Oklahoma gardeners in Zone 7a have a 35-week growing season for lettuce (March 15 to November 15). Oklahoma's spring and fall windows both work well for lettuce — some gardeners plant both successions for a long harvest. This guide gives exact dates for Oklahoma based on your local frost calendar.
Lettuce Planting Dates for Oklahoma
| Start seeds indoors | February 15–22 |
| Last frost (average) | March 15 |
| Transplant outdoors | February 15–25 |
| Direct sow outdoors | February 1–11 |
| Expect first harvest | March 17 – April 16 |
| Fall crop start | October 4–14 |
| Fall harvest | November 3 |
| First fall frost (average) | November 15 |
Growing Lettuce in Oklahoma's Climate
Oklahoma's moderate Zone 7a climate is well-suited to lettuce 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 lettuce 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 lettuce pests to watch for in Oklahoma include Aphids and Slugs. The first line of defense is companion planting: Carrot and Radish 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.
Lettuce Garden Calendar for Oklahoma
| 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 | — | 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 | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| November | First frost approaches | Harvest remaining lettuce; cover plants on frost nights |
| December | — | Dormant season |
Lettuce Growing Tips for Oklahoma Gardeners
- •Direct sow very shallowly — lettuce seeds need light to germinate; cover with just 1/8 inch of soil.
- •Cut outer leaves 1 inch above the crown for "cut-and-come-again" harvests lasting weeks.
- •Oklahoma's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Provide afternoon shade in warmer climates (Zones 7+) to extend the spring window before heat bolts plants.
Companion Planting for Lettuce in Oklahoma
In Oklahoma's moderate climate, planting lettuce with Carrot and Radish helps deter pests and improve soil. Avoid planting near Fennel and Celery, which inhibit lettuce growth through root chemistry or shared pest pressure. See the full lettuce companion planting guide for the complete list.
Lettuce 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 lettuce in Oklahoma?
In Oklahoma (Zone 7a), start lettuce seeds indoors around February 15–22 and transplant outdoors around February 15–25 — 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 lettuce year-round in Oklahoma?
lettuce 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 lettuce varieties grow best in Oklahoma?
For Oklahoma's Zone 7a, Buttercrunch, Romaine, and Black-Seeded Simpson perform well across most conditions.
When do I start lettuce seeds indoors in Oklahoma?
Start lettuce seeds indoors in Oklahoma around February 15–22, which is 4 weeks before the state's average last frost of March 15. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.