Downingtown, PA 19335 Frost Dates
When can you plant in Downingtown, PA?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. The first fall frost typically arrives around 11/01, about 205 frost-free days later.
The USDA Plant Hardiness Zone Map puts Downingtown in Zone 7a (0 to 5°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 9 weeks of growing season left in Downingtown before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Downingtown's last frost
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/28 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Downingtown compares
About 205 days separate Downingtown's last and first frost, putting it 16,216 of 40,283 ZIP codes nationally. Within PA, it ranks 130 of 2,088.
Learn more
zone vs. frost date covers why Zone 7a and Downingtown's frost date answer different questions. the frost range covers how to read the range around Downingtown's dates instead of trusting one.