Westbrook, ME 04024 Frost Dates
When can you plant in Westbrook, ME?
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 5a (-20 to -15°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
About 5 weeks of growing season left in Westbrook before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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
Westbrook's growing season runs about 148 days, ranking 35,658 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 309 of 456.
Learn more
the frost range covers how to read the range around Westbrook's dates instead of trusting one. local microclimates covers what one yard in Westbrook can differ from the 04024 normal.