Lewiston, ME 04263 Frost Dates
Frost dates for Lewiston, ME, ZIP 04263
Typically, the last spring freeze lands around 05/06, roughly 251 days out. The first fall frost typically arrives around 10/03, about 148 frost-free days later.
Lewiston sits in USDA Zone 5b (-15 to -10°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 5b around Lewiston has about 5 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
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lewiston compares
About 148 days separate Lewiston's last and first frost, putting it 35,622 of 40,283 ZIP codes nationally. Within ME, it ranks 285 of 456.
Learn more
the frost range explains how to read the range around Lewiston's dates instead of trusting one, and local microclimates explains what one yard in Lewiston can differ from the 04263 normal.