Westbrook, ME 04020 Frost Dates
When can you plant in Westbrook, ME?
Typically, the last spring freeze lands around 05/14, roughly 259 days out. The first fall frost typically arrives around 09/30, about 136 frost-free days later.
Westbrook sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a 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.
The actual range around Westbrook's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Westbrook compares
About 136 days separate Westbrook's last and first frost, putting it 37,643 of 40,283 ZIP codes nationally. Within ME, it ranks 405 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 04020 normal.