Canonsburg, PA 15339 Frost Dates
When can you plant in Canonsburg, PA?
Around 04/18 is the usual last spring frost, about 233 days away. The first fall frost typically arrives around 10/28, about 193 frost-free days later.
Canonsburg 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
About 9 weeks of growing season left in Canonsburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Canonsburg's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/02 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Canonsburg compares
At roughly 193 frost-free days, Canonsburg places 19,780 of 40,283 ZIP codes in this dataset. Within PA, it ranks 418 of 2,088.
Learn more
local microclimates covers what one yard in Canonsburg can differ from the 15339 normal. zone vs. frost date covers why Zone 6b and Canonsburg's frost date answer different questions.