What Grows in Dewey Beach, Delaware

The last hard freeze (28°F) in Dewey Beach typically lands around Mar 11, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Apr 1.

The first hard freeze (28°F) in Dewey Beach typically arrives around Dec 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 17, so the watching starts about Nov 1 — about 265 days after the spring freeze cleared.

Measured between 28°F hard freezes, Dewey Beach sees about 265 frost-free days — roughly Mar 11 through Dec 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 1 to Nov 17, about 230 days.

The federal record around Dewey Beach is a meaningful one — 581 documented sites, mostly Nitrate entries (362), the nearest Underground Storage Tanks record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.

From about Nov 1 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Dec 1 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Dec 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.