Rockland, ME 04851 Frost Dates
Frost dates for Rockland, ME, ZIP 04851
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/25, about 178 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rockland in Zone 7a (0 to 5°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
Zone 7a around Rockland has about 8 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.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rockland compares
About 178 days separate Rockland's last and first frost, putting it 25,665 of 40,283 ZIP codes nationally. Within ME, it ranks 6 of 456.
Learn more
local microclimates explains what one yard in Rockland can differ from the 04851 normal, and zone vs. frost date explains why Zone 7a and Rockland's frost date answer different questions.