When to plant cucumbers in Oklahoma
Oklahoma’s average last spring frost is April 1, and the first fall frost typically arrives around November 1 — about 214 frost-free days (USDA zones 6b, 7a, 7b, 8a). Cucumber needs 50–70 days to mature, which fits comfortably within Oklahoma's growing season.
When to plant cucumbers in Oklahoma: the short answer
For a spring planting, plant out Apr 8 – Apr 25, with seeds started indoors Mar 4 – Mar 18. Wait until the soil is at least 60°F and frost is over.
Succession sow again in Oklahoma: May 6 · May 27 · Jun 17 · Jul 8 · Jul 29 · Aug 19
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow cucumbers in Oklahoma, step by step
- Start seeds indoors (Mar 4 – Mar 18). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 3-10 days to sprout, fastest in soil around 85°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 14 inches deep, with a pH between 5.5 and 7.0. Dig in compost before planting.
- Plant out (Apr 8 – Apr 25). Space plants about 12 inches apart in rows 48 inches apart. It is killed by frost, so nothing goes outside until the danger has passed.
- Water and feed. It needs plenty of water; keep the soil evenly moist and never let it dry out.
- Watch for pests and problems. Pests: striped cucumber beetle, squash bug, aphids, spider mite. Diseases and disorders: powdery mildew, downy mildew, bacterial wilt, angular leaf spot.
- Harvest (from about Jun 4 – Jun 24). Cucumber takes 50-70 days to reach harvest. Resents root disturbance - if starting indoors use peat/paper pots. Trellising doubles the plants per square foot and cuts disease. A second sowing in midsummer beats early beetle pressure.
Figures come from our crop data; dates use Oklahoma’s average frost dates. More in the full cucumber growing guide.
Cucumber planting dates by USDA zone in Oklahoma
Oklahoma spans USDA zones 6b, 7a, 7b, 8a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the cucumber dates shift with them.
When to plant cucumbers in nearby states
| State | Last frost | Plant out |
|---|---|---|
| Oklahoma (this page) | April 1 | Apr 8 – Apr 25 |
| North Dakota | May 15 | May 22 – Jun 8 |
| South Dakota | May 10 | May 17 – Jun 3 |
| Nebraska | April 30 | May 7 – May 24 |
| Kansas | April 15 | Apr 22 – May 9 |
Questions gardeners in Oklahoma ask
When is the best time to plant cucumbers in Oklahoma?
Plant cucumber transplants outdoors in Oklahoma between April 8 and April 25. That timing is set by Oklahoma's average last spring frost of April 1.
When should I start cucumber seeds indoors in Oklahoma?
Start seeds indoors between March 4 and March 18, about 3 weeks before the last frost, so the seedlings are ready to plant out from April 8.
Can I plant cucumbers in the fall in Oklahoma?
Yes. For a fall crop, sow between July 30 and August 16, so the crop matures in cool weather before Oklahoma's first frost around November 1.
When will cucumbers planted in Oklahoma be ready to harvest?
Planted on time, cucumbers are usually ready from about June 4 to June 24, 50-70 days after planting.
When is the last frost in Oklahoma?
On average around April 1, with the first fall frost around November 1 - about 214 frost-free days. Your town may differ by two weeks or more.