Calais, ME 04490 Frost Dates
When can you plant in Calais, ME?
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/08, about 155 frost-free days later.
The USDA Plant Hardiness Zone Map puts Calais in Zone 5a (-20 to -15°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 6 weeks of growing season left in Calais before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Calais's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Calais compares
Calais's growing season runs about 155 days, ranking 33,982 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 203 of 456.
Learn more
the frost range covers how to read the range around Calais's dates instead of trusting one. local microclimates covers what one yard in Calais can differ from the 04490 normal.