Smyrna, DE 19977 Frost Dates
When can you plant in Smyrna, DE?
Typically, the last spring freeze lands around 04/04, roughly 219 days out. The first fall frost typically arrives around 11/04, about 214 frost-free days later.
The USDA Plant Hardiness Zone Map puts Smyrna 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
About 10 weeks of growing season left in Smyrna before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Smyrna's last frost
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 Smyrna compares
Smyrna's growing season runs about 214 days, ranking 14,234 of 40,283 US ZIP codes measured here, longest to shortest. Within DE, it ranks 16 of 96.
Learn more
local microclimates covers what one yard in Smyrna can differ from the 19977 normal. zone vs. frost date covers why Zone 7b and Smyrna's frost date answer different questions.