Oklahoma · zones 6b–7b
When to plant zucchini in Oklahoma.
Sow between Apr 6 to Jul 20 in a typical year, keyed to Oklahoma's median last frost around Mar 30. A second, fall sowing fits Jul 21 to Aug 9. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Zucchini dates for a typical Oklahoma season.
Direct sow
Apr 6 to Jul 20
Keyed to the ~Mar 30 last frost. Sow 1" deep, 24" apart.
Fall round
Jul 21 to Aug 9
Counted back from the ~Nov 4 first frost.
Harvest
~50 days later
~8 lb per plant over ~5 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 zucchini here.
A middle-length season, about 219 frost-free days, means squash, summer overlaps squash bugs for a stretch each summer. Check plants every week or two and treat early.
Gray shield bugs; leaves wilt and get crispy patches.
Organic fix: Lay a board out overnight and collect them at dawn; scrape bronze egg clusters off leaf undersides.
Sudden wilt with sawdust-like frass at the stem base.
Organic fix: Cover young plants; slit the stem to remove the grub, or inject Bt.
Yellow striped or spotted beetles chewing leaves and blossoms.
Organic fix: Row cover until the first female flowers open, then hand-pick.
White powder coating the leaves late in the season.
Organic fix: Space for airflow, water the soil rather than the leaves, use resistant varieties.
Your season math: Oklahoma gives zucchini about 219 frost-free days, and it needs roughly 50 days to a first harvest. That fits about 6 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting zucchini in Oklahoma: questions
When should I plant zucchini in Oklahoma?+
In a typical Oklahoma year, sow zucchini between Apr 6 to Jul 20, keyed to the state's median last frost around Mar 30. There's also a fall window: Jul 21 to Aug 9. Your exact dates shift with your ZIP code and microclimate.
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 zucchini 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.