Westbrook, ME 04105 Frost Dates
Frost dates for Westbrook, ME, ZIP 04105
Around 04/26 is the usual last spring frost, about 241 days away. The first fall frost typically arrives around 10/15, about 170 frost-free days later.
The USDA Plant Hardiness Zone Map puts Westbrook in Zone 6a (-10 to -5°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 6a around Westbrook has about 7 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 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Westbrook compares
About 170 days separate Westbrook's last and first frost, putting it 28,915 of 40,283 ZIP codes nationally. Within ME, it ranks 129 of 456.
Learn more
zone vs. frost date explains why Zone 6a and Westbrook's frost date answer different questions, and the frost range explains how to read the range around Westbrook's dates instead of trusting one.