Millbourne, PA 19131 Frost Dates
19131, near Millbourne, PA: the frost window
Around 04/02 is the usual last spring frost, about 217 days away. Fall's first freeze usually shows up around 11/10, roughly 224 days after the last spring frost.
Zone 7b (5 to 10°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 Millbourne, not a forecast for this year.
Stretching the season past the first frost
Millbourne's growing season runs out in roughly 11 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 Millbourne's last frost
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/13 and only about 1 year in 10 sees frost after that.
Millbourne against the rest of the dataset
About 224 days separate Millbourne's last and first frost, putting it 11,924 of 40,283 ZIP codes nationally. Within PA, it ranks 42 of 2,088.
Learn more
Two guides worth reading on 19131: the frost range, on how to read the range around Millbourne's dates instead of trusting one, and local microclimates, on what one yard in Millbourne can differ from the 19131 normal.