Westbrook, ME 04092 Frost Dates
Westbrook, ME: when does the frost end?
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/15, roughly 170 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 7 weeks until Westbrook's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Westbrook against the rest of the dataset
Westbrook's growing season runs about 170 days, ranking 28,913 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 127 of 456.
Learn more
Before leaning on 04092's figures: local microclimates explains what one yard in Westbrook can differ from the 04092 normal, while zone vs. frost date explains why Zone 5b and Westbrook's frost date answer different questions.