Bristol, PA 19007 Frost Dates
19007, near Bristol, PA: the frost window
Typically, the last spring freeze lands around 04/15, roughly 230 days out. Fall's first freeze usually shows up around 10/29, roughly 196 days after the last spring frost.
Bristol sits in USDA Zone 7b (5 to 10°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.
Stretching the season past the first frost
Bristol'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.
Why 04/15 isn't a guarantee
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Bristol against the rest of the dataset
Bristol's growing season runs about 196 days, ranking 18,939 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 376 of 2,088.
Learn more
Two guides worth reading on 19007: the frost range, on how to read the range around Bristol's dates instead of trusting one, and local microclimates, on what one yard in Bristol can differ from the 19007 normal.