Collegeville, PA 19408 Frost Dates
Frost dates for Collegeville, PA, ZIP 19408
Around 04/18 is the usual last spring frost, about 233 days away. The first fall frost typically arrives around 10/27, about 192 frost-free days later.
Collegeville sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 7a around Collegeville has about 9 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.
The actual range around Collegeville's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Collegeville compares
Collegeville's growing season runs about 192 days, ranking 20,279 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 518 of 2,088.
Learn more
local microclimates explains what one yard in Collegeville can differ from the 19408 normal, and zone vs. frost date explains why Zone 7a and Collegeville's frost date answer different questions.