Washington, DC planting calendar

When to plant oregano in Washington, DC — sow, transplant & harvest dates

Washington, DC is mostly USDA zone 8a (range 7b-8a). Dates below are derived from oregano's frost tolerance and Washington, DC's frost window — not generic national averages.

Oregano planting timetable for Washington, DC

Stage	When in Washington, DC	Anchor
Start seeds indoors	early March (March 4)	6 weeks before the last frost (mid-April)
Transplant outside	mid-April (April 15)	0 days after the last frost (mid-April)
First harvest (estimate)	early July (July 4)	~80 days from transplant

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Washington, DC's climate shifts the oregano dates

Washington, DC's last spring frost averages mid-April and first fall frost late October, which sets the whole planting clock. Washington, DC sits in a warm mid-Atlantic pocket where the urban heat island pushes much of the city into zone 8a — warmer than the surrounding suburbs. Wait for warm soil — oregano stall in cold ground even after the air warms, so don't rush them out.

Oregano is a hardy perennial in zones 5-10 and is easiest to start from seed indoors 6-8 weeks before the last spring frost, or from divisions or cuttings; seeds are tiny and slow to produce harvestable growth. Transplant outdoors around the last frost date once soil has warmed to at least 13 °C — established plants tolerate light frost. In zones 4 and colder, treat as an annual or overwinter divisions in a cold frame; in zones 9-11 it stays evergreen but may die back in intense summer heat without afternoon shade.

Frost-risk note

Don't plant before mid-April — a hard freeze can still set young plants back. In outer neighborhoods away from the urban core (zone 7b) the safe date runs a week or two later.

Regional variation within Washington, DC

outer neighborhoods away from the urban core (zone 7b) runs roughly 1-2 weeks behind the state average; the dense urban core, lifted by the city heat-island (zone 8a) can plant 1-2 weeks earlier.

Downtown DC — USDA zone 8a
Georgetown — USDA zone 8a
Anacostia — USDA zone 7b

What else to plant in Washington, DC around then

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: 13-21 °C (55-70 °F).
Spacing: 8-12 inches (20-30 cm) between plants.
Days to harvest: ~80 days from planting out.

Frequently asked questions

When is the best time to plant oregano in Washington, DC?

In Washington, DC (mostly USDA zone 8a), sow oregano indoors around early March, transplant outdoors mid-April (after the last frost, mid-April), and harvest from early July. Oregano are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

What USDA zone is Washington, DC?

Most of Washington, DC sits in USDA hardiness zone 8a, with the state spanning roughly 7b-8a from outer neighborhoods away from the urban core (zone 7b) to the dense urban core, lifted by the city heat-island (zone 8a). The last spring frost averages mid-April and the first fall frost late October.

Can you grow oregano in Washington, DC?

Yes. Washington, DC's dominant zone 8a supports oregano — the key is timing. Oregano are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

Does the planting date change across Washington, DC?

outer neighborhoods away from the urban core (zone 7b) runs roughly 1-2 weeks behind the state average; the dense urban core, lifted by the city heat-island (zone 8a) can plant 1-2 weeks earlier.

What else can I plant in Washington, DC around the same time?

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.