Lock Haven, PA 17745 Frost Dates
17745, near Lock Haven, PA: the frost window
Around 04/25 is the usual last spring frost, about 240 days away. Fall's first freeze usually shows up around 10/19, roughly 175 days after the last spring frost.
Zone 6a (-10 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 Lock Haven, not a forecast for this year.
Stretching the season past the first frost
Lock Haven's growing season runs out in roughly 7 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 Lock Haven's last frost
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Lock Haven against the rest of the dataset
At roughly 175 frost-free days, Lock Haven places 26,845 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,127 of 2,088.
Learn more
Two guides worth reading on 17745: the frost range, on how to read the range around Lock Haven's dates instead of trusting one, and local microclimates, on what one yard in Lock Haven can differ from the 17745 normal.