Hartly, DE 19953 Frost Dates
Frost dates for Hartly, DE, ZIP 19953
Around 04/04 is the usual last spring frost, about 219 days away. The first fall frost typically arrives around 11/04, about 214 frost-free days later.
Zone 7b (5 to 10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Hartly, not a forecast for this year.
What to do before the first frost
Zone 7b around Hartly has about 10 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
04/04 is the middle of 30 years of NOAA records, not a promise. Plant by 03/22 and you're betting against frost in roughly 9 years out of 10. 04/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hartly compares
At roughly 214 frost-free days, Hartly places 14,394 of 40,283 ZIP codes in this dataset. Within DE, it ranks 30 of 96.
Learn more
zone vs. frost date explains why Zone 7b and Hartly's frost date answer different questions, and the frost range explains how to read the range around Hartly's dates instead of trusting one.