Confluence, PA 15424 Frost Dates
Confluence, PA: when does the frost end?
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 10/11, roughly 155 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Confluence 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
With roughly 6 weeks until Confluence's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/09 isn't a guarantee
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Confluence against the rest of the dataset
About 155 days separate Confluence's last and first frost, putting it 34,064 of 40,283 ZIP codes nationally. Within PA, it ranks 1,803 of 2,088.
Learn more
Before leaning on 15424's figures: local microclimates explains what one yard in Confluence can differ from the 15424 normal, while zone vs. frost date explains why Zone 6a and Confluence's frost date answer different questions.