Lock Haven, PA 17726 Frost Dates
Frost dates for Lock Haven, PA, ZIP 17726
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.
Lock Haven sits in USDA Zone 6b (-5 to 0°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.
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
About 175 days separate Lock Haven's last and first frost, putting it 26,844 of 40,283 ZIP codes nationally. Within PA, it ranks 1,126 of 2,088.
Learn more
local microclimates explains what one yard in Lock Haven can differ from the 17726 normal, and zone vs. frost date explains why Zone 6b and Lock Haven's frost date answer different questions.