Downingtown, PA 19425 Frost Dates
When can you plant in Downingtown, PA?
The last spring frost here typically falls around 04/11, about 226 days from today. 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
Downingtown's growing season runs about 205 days, ranking 16,219 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 133 of 2,088.
Learn more
local microclimates covers what one yard in Downingtown can differ from the 19425 normal. zone vs. frost date covers why Zone 7a and Downingtown's frost date answer different questions.