New Castle, DE 08070 Frost Dates
08070, near New Castle, DE: the frost window
Typically, the last spring freeze lands around 04/07, roughly 222 days out. Fall's first freeze usually shows up around 11/01, roughly 209 days after the last spring frost.
New Castle sits in USDA Zone 7b (5 to 10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
New Castle'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 New Castle's last frost
04/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/21 and only about 1 year in 10 sees frost after that.
New Castle against the rest of the dataset
New Castle's growing season runs about 209 days, ranking 15,205 of 40,283 US ZIP codes measured here, longest to shortest. Within DE, it ranks 43 of 96.
Learn more
Two guides worth reading on 08070: zone vs. frost date, on why Zone 7b and New Castle's frost date answer different questions, and the frost range, on how to read the range around New Castle's dates instead of trusting one.