When to Plant Tomatoes in Oklahoma
Published: April 21, 2026
Oklahoma gardeners in Zone 7a have a 35-week growing season for tomato (March 15 to November 15). The moderate climate supports a full warm-season crop plus an often-productive fall crop. This guide gives exact dates for Oklahoma based on your local frost calendar.
Tomato Planting Dates for Oklahoma
| Start seeds indoors | February 1–8 |
| Last frost (average) | March 15 |
| Transplant outdoors | March 29–April 8 |
| Expect first harvest | May 28 – June 22 |
| Fall crop start | August 23–September 2 |
| Fall harvest | October 22 |
| First fall frost (average) | November 15 |
⚠ Warm-climate gardeners (TX, FL, AZ) can grow TWO crops: spring (Feb–March transplant) and fall (July transplant for October harvest).
Growing Tomatoes in Oklahoma's Climate
Oklahoma's moderate Zone 7a climate is well-suited to tomato 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 tomato 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 tomato pests to watch for in Oklahoma include Tomato Hornworm and Aphids. The first line of defense is companion planting: Basil and Marigold 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.
Tomato Garden Calendar for Oklahoma
| 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 60°F+; nighttime lows above 50°F |
| April | — | Dormant season |
| May ← | First harvest window opens | Tomato begins producing 60–85 days after transplant |
| June | Peak growth; water 1 inch/week | Monitor for pests daily; stake or support as needed |
| July | Start fall crop seeds | Fall transplants go in 12 weeks before first frost |
| August | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| September | — | Dormant season |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining tomato; cover plants on frost nights |
| December | — | Dormant season |
Tomato Growing Tips for Oklahoma Gardeners
- •Bury the stem 2/3 deep when transplanting — roots grow from the buried stem for a stronger plant.
- •Consistent watering prevents blossom end rot and fruit cracking; uneven moisture causes both.
- •Oklahoma's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Stop heavy nitrogen once flowers appear — it causes leafy plants with few tomatoes.
Companion Planting for Tomatoes in Oklahoma
In Oklahoma's moderate climate, planting tomato with Basil and Marigold helps deter pests and improve soil. Avoid planting near Potato and Fennel, which inhibit tomato growth through root chemistry or shared pest pressure. See the full tomato companion planting guide for the complete list.
Tomatoes 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 tomato in Oklahoma?
In Oklahoma (Zone 7a), start tomato seeds indoors around February 1–8 and transplant outdoors around March 29–April 8 — 2 weeks after 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 tomato year-round in Oklahoma?
Not year-round — Oklahoma's cold season stops tomato production. The tomato season runs March 15 to November 15, roughly 35 weeks. A fall crop extends harvest into late autumn.
What tomato varieties grow best in Oklahoma?
For Oklahoma's Zone 7a, Classic mid-season varieties like Better Boy, Big Beef, and Roma perform well across most conditions.
When do I start tomato seeds indoors in Oklahoma?
Start tomato seeds indoors in Oklahoma around February 1–8, which is 6 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.