Oswego, NY 13115 Frost Dates
Frost dates for Oswego, NY, ZIP 13115
The last spring frost here typically falls around 04/22, about 237 days from today. The first fall frost typically arrives around 10/29, about 187 frost-free days later.
Oswego sits in USDA Zone 6a (-10 to -5°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 6a around Oswego has about 9 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.
The actual range around Oswego's last frost
04/22 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. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oswego compares
About 187 days separate Oswego's last and first frost, putting it 22,308 of 40,283 ZIP codes nationally. Within NY, it ranks 437 of 1,951.
Learn more
the frost range explains how to read the range around Oswego's dates instead of trusting one, and local microclimates explains what one yard in Oswego can differ from the 13115 normal.