Carnegie, PA 15106 Frost Dates
When can you plant in Carnegie, PA?
Around 04/23 is the usual last spring frost, about 238 days away. The first fall frost typically arrives around 10/23, about 181 frost-free days later.
The USDA Plant Hardiness Zone Map puts Carnegie in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 8 weeks of growing season left in Carnegie before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/23 isn't a guarantee
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Carnegie compares
Carnegie's growing season runs about 181 days, ranking 24,490 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 820 of 2,088.
Learn more
local microclimates covers what one yard in Carnegie can differ from the 15106 normal. zone vs. frost date covers why Zone 6b and Carnegie's frost date answer different questions.