Delaware City, DE 19721 Frost Dates
Frost dates for Delaware City, DE, ZIP 19721
The last spring frost here typically falls around 04/07, about 222 days from today. The first fall frost typically arrives around 11/01, about 209 frost-free days later.
The USDA Plant Hardiness Zone Map puts Delaware City in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7b around Delaware City has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/26 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Delaware City compares
About 209 days separate Delaware City's last and first frost, putting it 15,272 of 40,283 ZIP codes nationally. Within DE, it ranks 58 of 96.
Learn more
local microclimates explains what one yard in Delaware City can differ from the 19721 normal, and zone vs. frost date explains why Zone 7b and Delaware City's frost date answer different questions.