When to plant swiss chard 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). Swiss Chard needs 50–60 days to mature, which fits comfortably within District of Columbia's growing season.
When to plant swiss chard in District of Columbia: the short answer
For a spring planting, plant out Mar 20 – Apr 6, with seeds started indoors Mar 6 – Mar 20. Seeds germinate in soil from 40 to 85°F.
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 swiss chard in District of Columbia, step by step
- Start seeds indoors (Mar 6 – Mar 20). Sow seeds 0.75 inch deep in seed-starting mix under bright light. They take 5-14 days to sprout, fastest in soil around 70°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. It needs six or more hours of sun for the best growth, though four to six hours in partial shade is enough and loose soil at least 12 inches deep, with a pH between 6.0 and 7.5. Dig in compost before planting.
- Plant out (Mar 20 – Apr 6). Space plants about 9 inches apart in rows 18 inches apart. It tolerates a light frost but not a hard freeze. As a cool-season crop it does best before summer heat arrives in District of Columbia.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: leaf miner, aphids, flea beetle. Diseases and disorders: cercospora leaf spot, downy mildew.
- Harvest (from about May 16 – May 26). Swiss Chard takes 50-60 days to reach harvest. One of the most heat-tolerant leafy greens - a single spring sowing usually carries through summer into fall if kept picked.
Figures come from our crop data; dates use District of Columbia’s average frost dates. More in the full swiss chard growing guide.
Swiss Chard 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 swiss chard dates shift with them.
When to plant swiss chard in nearby states
| State | Last frost | Plant out |
|---|---|---|
| District of Columbia (this page) | April 10 | Mar 20 – Apr 6 |
| New Jersey | April 20 | Mar 30 – Apr 16 |
| Pennsylvania | May 1 | Apr 10 – Apr 27 |
| Delaware | April 14 | Mar 24 – Apr 10 |
| Maryland | April 14 | Mar 24 – Apr 10 |
| Virginia | April 15 | Mar 25 – Apr 11 |
| West Virginia | May 5 | Apr 14 – May 1 |
Questions gardeners in District of Columbia ask
When is the best time to plant swiss chard in District of Columbia?
Plant swiss chard transplants outdoors in District of Columbia between March 20 and April 6. That timing is set by District of Columbia's average last spring frost of April 10.
When should I start swiss chard seeds indoors in District of Columbia?
Start seeds indoors between March 6 and March 20, about 4 weeks before the last frost, so the seedlings are ready to plant out from March 20.
Can I plant swiss chard in the fall in District of Columbia?
Yes. For a fall crop, sow between August 6 and August 23, so the crop matures in cool weather before District of Columbia's first frost around October 25.
When will swiss chard planted in District of Columbia be ready to harvest?
Planted on time, swiss chard is usually ready from about May 16 to May 26, 50-60 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.