Harrington, DE 19952 Frost Dates
19952, near Harrington, DE: the frost window
Around 04/11 is the usual last spring frost, about 226 days away. Fall's first freeze usually shows up around 10/30, roughly 200 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Harrington in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Harrington's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Harrington's last frost
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/28 and only about 1 year in 10 sees frost after that.
Harrington against the rest of the dataset
Harrington's growing season runs about 200 days, ranking 17,784 of 40,283 US ZIP codes measured here, longest to shortest. Within DE, it ranks 89 of 96.
Learn more
Two guides worth reading on 19952: local microclimates, on what one yard in Harrington can differ from the 19952 normal, and zone vs. frost date, on why Zone 7b and Harrington's frost date answer different questions.