When to plant cucumbers in District of Columbia
District of Columbia’s average last spring frost is April 10, and the first fall frost typically arrives around October 25 — about 198 frost-free days (USDA zones 7a, 7b, 8a). Cucumber needs 50–70 days to mature, which fits comfortably within District of Columbia's growing season.
When to plant cucumbers in District of Columbia: the short answer
For a spring planting, plant out Apr 17 – May 4, with seeds started indoors Mar 13 – Mar 27. Wait until the soil is at least 60°F and frost is over.
Succession sow again in District of Columbia: May 15 · Jun 5 · Jun 26 · Jul 17 · Aug 7
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 District of Columbia, step by step
- Start seeds indoors (Mar 13 – Mar 27). 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 17 – May 4). 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 13 – Jul 3). 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 District of Columbia’s average frost dates. More in the full cucumber growing guide.
Cucumber planting dates by USDA zone in District of Columbia
District of Columbia spans USDA zones 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 |
|---|---|---|
| District of Columbia (this page) | April 10 | Apr 17 – May 4 |
| New Jersey | April 20 | Apr 27 – May 14 |
| Pennsylvania | May 1 | May 8 – May 25 |
| Delaware | April 14 | Apr 21 – May 8 |
| Maryland | April 14 | Apr 21 – May 8 |
| Virginia | April 15 | Apr 22 – May 9 |
| West Virginia | May 5 | May 12 – May 29 |
Questions gardeners in District of Columbia ask
When is the best time to plant cucumbers in District of Columbia?
Plant cucumber transplants outdoors in District of Columbia between April 17 and May 4. That timing is set by District of Columbia's average last spring frost of April 10.
When should I start cucumber seeds indoors in District of Columbia?
Start seeds indoors between March 13 and March 27, about 3 weeks before the last frost, so the seedlings are ready to plant out from April 17.
Can I plant cucumbers in the fall in District of Columbia?
Yes. For a fall crop, sow between July 23 and August 9, so the crop matures in cool weather before District of Columbia's first frost around October 25.
When will cucumbers planted in District of Columbia be ready to harvest?
Planted on time, cucumbers are usually ready from about June 13 to July 3, 50-70 days after planting.
When is the last frost in District of Columbia?
On average around April 10, with the first fall frost around October 25 - about 198 frost-free days. Your town may differ by two weeks or more.