California, PA 15423 Frost Dates
Frost dates for California, PA, ZIP 15423
The last spring frost here typically falls around 05/02, about 247 days from today. The first fall frost typically arrives around 10/20, about 170 frost-free days later.
California 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
Zone 6b around California has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How California compares
About 170 days separate California's last and first frost, putting it 28,989 of 40,283 ZIP codes nationally. Within PA, it ranks 1,465 of 2,088.
Learn more
the frost range explains how to read the range around California's dates instead of trusting one, and local microclimates explains what one yard in California can differ from the 15423 normal.