Westbrook, ME 04084 Frost Dates
Frost dates for Westbrook, ME, ZIP 04084
Typically, the last spring freeze lands around 05/07, roughly 252 days out. The first fall frost typically arrives around 10/04, about 148 frost-free days later.
The USDA Plant Hardiness Zone Map puts Westbrook 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 Westbrook 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
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 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 Westbrook compares
About 148 days separate Westbrook's last and first frost, putting it 35,661 of 40,283 ZIP codes nationally. Within ME, it ranks 312 of 456.
Learn more
local microclimates explains what one yard in Westbrook can differ from the 04084 normal, and zone vs. frost date explains why Zone 5b and Westbrook's frost date answer different questions.