Hallowell, ME 04284 Frost Dates
Frost dates for Hallowell, ME, ZIP 04284
Typically, the last spring freeze lands around 05/11, roughly 256 days out. The first fall frost typically arrives around 09/29, about 138 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hallowell in Zone 5b (-15 to -10°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
Zone 5b around Hallowell 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.
Why 05/11 isn't a guarantee
05/11 is the middle of 30 years of NOAA records, not a promise. Plant by 04/29 and you're betting against frost in roughly 9 years out of 10. 05/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hallowell compares
Hallowell's growing season runs about 138 days, ranking 37,396 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 376 of 456.
Learn more
the frost range explains how to read the range around Hallowell's dates instead of trusting one, and local microclimates explains what one yard in Hallowell can differ from the 04284 normal.