Calais, ME 04694 Frost Dates
Frost dates for Calais, ME, ZIP 04694
Typically, the last spring freeze lands around 04/21, roughly 236 days out. The first fall frost typically arrives around 10/26, about 185 frost-free days later.
Calais 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 Calais 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.
The actual range around Calais's last frost
04/21 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. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Calais compares
About 185 days separate Calais's last and first frost, putting it 23,166 of 40,283 ZIP codes nationally. Within ME, it ranks 3 of 456.
Learn more
the frost range explains how to read the range around Calais's dates instead of trusting one, and local microclimates explains what one yard in Calais can differ from the 04694 normal.