Oklahoma, PA 15613 Frost Dates
Oklahoma, PA: when does the frost end?
Around 04/29 is the usual last spring frost, about 244 days away. Fall's first freeze usually shows up around 10/20, roughly 171 days after the last spring frost.
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 Oklahoma, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Oklahoma's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Oklahoma's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Oklahoma against the rest of the dataset
About 171 days separate Oklahoma's last and first frost, putting it 28,751 of 40,283 ZIP codes nationally. Within PA, it ranks 1,439 of 2,088.
Learn more
Before leaning on 15613's figures: local microclimates explains what one yard in Oklahoma can differ from the 15613 normal, while zone vs. frost date explains why Zone 6b and Oklahoma's frost date answer different questions.