Clarion, PA 16214 Frost Dates
16214, near Clarion, PA: the frost window
Around 05/10 is the usual last spring frost, about 255 days away. Fall's first freeze usually shows up around 10/12, roughly 155 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Clarion in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Clarion's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Clarion against the rest of the dataset
Clarion's growing season runs about 155 days, ranking 33,966 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,776 of 2,088.
Learn more
Two guides worth reading on 16214: the frost range, on how to read the range around Clarion's dates instead of trusting one, and local microclimates, on what one yard in Clarion can differ from the 16214 normal.