Lansdale, PA 19423 Frost Dates
When can you plant in Lansdale, PA?
Typically, the last spring freeze lands around 04/24, roughly 239 days out. The first fall frost typically arrives around 10/15, about 173 frost-free days later.
Zone 7a (0 to 5°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 Lansdale, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in Lansdale before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Lansdale's last frost
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lansdale compares
Lansdale's growing season runs about 173 days, ranking 27,800 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,313 of 2,088.
Learn more
local microclimates covers what one yard in Lansdale can differ from the 19423 normal. zone vs. frost date covers why Zone 7a and Lansdale's frost date answer different questions.