Westbrook, ME 04097 Frost Dates
Frost dates for Westbrook, ME, ZIP 04097
Typically, the last spring freeze lands around 04/28, roughly 243 days out. The first fall frost typically arrives around 10/19, about 172 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Westbrook, not a forecast for this year.
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.
How much risk comes with planting early here
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Westbrook compares
At roughly 172 frost-free days, Westbrook places 28,193 of 40,283 ZIP codes in this dataset. Within ME, it ranks 87 of 456.
Learn more
the frost range explains how to read the range around Westbrook's dates instead of trusting one, and local microclimates explains what one yard in Westbrook can differ from the 04097 normal.