Oklahoma · zones 6b–7b
When to plant tomatoes in Oklahoma.
Sow or transplant between Apr 6 to Jun 6 in a typical year, keyed to Oklahoma's median last frost around Mar 30. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Tomatoes dates for a typical Oklahoma season.
1 · Start indoors
Feb 23 to Apr 25
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Apr 6 to Jun 6
Keyed to the ~Mar 30 last frost. Sow 0.25" deep, 24" apart.
Harvest
~73 days later
~12 lb per plant over ~8 weeks.
Oklahoma spans more than one climate: Zone 7 is the most common zone, but the state runs 6b to 7b. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
In Oklahoma: watch for
The pests that find tomatoes here.
A middle-length season, about 219 frost-free days, means tomato, slicing overlaps tomato hornworm for a stretch each summer. Check plants every week or two and treat early.
Big green caterpillars strip leaves and leave black droppings.
Organic fix: Handpick at dusk; spray Bt on the young ones.
Clusters on new growth, sticky leaves, curling tips.
Organic fix: Blast with water, then insecticidal soap or neem.
Dark spots with concentric rings, starting on the lowest, oldest leaves.
Organic fix: Remove affected leaves, mulch to stop soil splash, space for airflow.
Greasy, water-soaked blotches in cool, wet spells. No rings, and not bottom-up.
Organic fix: Pull infected plants fast, keep leaves dry, use neem as a preventive.
Septoria leaf spot
Many small tan spots with dark brown edges, low leaves first, no rings inside.
Organic fix: Strip the lowest leaves, mulch against soil splash, stake for airflow.
Your season math: Oklahoma gives tomatoes about 219 frost-free days, and it needs roughly 73 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting tomatoes in Oklahoma: questions
When should I plant tomatoes in Oklahoma?+
In a typical Oklahoma year, sow tomatoes or set out transplants between Apr 6 to Jun 6, keyed to the state's median last frost around Mar 30. Your exact dates shift with your ZIP code and microclimate.
When do I start tomatoes seeds indoors in Oklahoma?+
Start seeds inside about 6 weeks before set-out: roughly Feb 23 to Apr 25 for a typical Oklahoma season.
What USDA zone is Oklahoma?+
Oklahoma spans zones 6b–7b, mostly zone 7. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many tomatoes plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.