Washington, DC planting calendar

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

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

Tomatoes 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	late April (April 25)	10 days after the last frost (mid-April)
First harvest (estimate)	early July (July 9)	~75 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 tomatoes 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 — tomatoes stall in cold ground even after the air warms, so don't rush them out.

Wait until soil has warmed to at least 16 °C and night temperatures stay above 10 °C. Tomatoes set fruit poorly below 13 °C at night and stop above 32 °C, which is why hot-zone gardeners run a spring + fall crop instead of one long summer.

Frost-risk note

Don't plant before mid-April — even a light frost will kill seedlings overnight. 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: 21-27 °C (70-80 °F).
Spacing: 24-36 inches (60-90 cm) between plants.
Days to harvest: ~75 days from planting out.

Frequently asked questions

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

In Washington, DC (mostly USDA zone 8a), sow tomatoes indoors around early March, transplant outdoors late April (after the last frost, mid-April), and harvest from early July. Tomatoes are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.

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 tomatoes in Washington, DC?

Yes. Washington, DC's dominant zone 8a supports tomatoes — the key is timing. Tomatoes are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.

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.