Lock Haven, PA 17748 Frost Dates
Frost dates for Lock Haven, PA, ZIP 17748
Around 04/25 is the usual last spring frost, about 240 days away. The first fall frost typically arrives around 10/19, about 175 frost-free days later.
Zone 6b (-5 to 0°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.
What to do before the first frost
Zone 6b around Lock Haven has about 7 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.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lock Haven compares
At roughly 175 frost-free days, Lock Haven places 26,846 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,128 of 2,088.
Learn more
local microclimates explains what one yard in Lock Haven can differ from the 17748 normal, and zone vs. frost date explains why Zone 6b and Lock Haven's frost date answer different questions.