Westbrook, ME 04104 Frost Dates
Westbrook, ME: when does the frost end?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/20, roughly 172 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 8 weeks until Westbrook's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Westbrook against the rest of the dataset
At roughly 172 frost-free days, Westbrook places 28,194 of 40,283 ZIP codes in this dataset. Within ME, it ranks 88 of 456.
Learn more
Before leaning on 04104's figures: zone vs. frost date explains why Zone 6a and Westbrook's frost date answer different questions, while the frost range explains how to read the range around Westbrook's dates instead of trusting one.