Canonsburg, PA 15317 Frost Dates
When can you plant in Canonsburg, PA?
The last spring frost here typically falls around 04/18, about 233 days from today. The first fall frost typically arrives around 10/28, about 193 frost-free days later.
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 Canonsburg, not a forecast for this year.
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.
How much risk comes with planting early here
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 19,779 of 40,283 ZIP codes in this dataset. Within PA, it ranks 417 of 2,088.
Learn more
local microclimates covers what one yard in Canonsburg can differ from the 15317 normal. zone vs. frost date covers why Zone 6b and Canonsburg's frost date answer different questions.