Conshohocken, PA 19428 Frost Dates
19428, near Conshohocken, PA: the frost window
Typically, the last spring freeze lands around 04/08, roughly 223 days out. Fall's first freeze usually shows up around 10/31, roughly 203 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Conshohocken in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Conshohocken's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Conshohocken's last frost
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/23 and only about 1 year in 10 sees frost after that.
Conshohocken against the rest of the dataset
Conshohocken's growing season runs about 203 days, ranking 16,873 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 191 of 2,088.
Learn more
Two guides worth reading on 19428: local microclimates, on what one yard in Conshohocken can differ from the 19428 normal, and zone vs. frost date, on why Zone 7b and Conshohocken's frost date answer different questions.