Rockland, ME 04864 Frost Dates
Frost dates for Rockland, ME, ZIP 04864
The last spring frost here typically falls around 04/27, about 242 days from today. The first fall frost typically arrives around 10/19, about 175 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rockland in Zone 5b (-15 to -10°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 5b around Rockland has about 7 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.
How much risk comes with planting early here
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. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rockland compares
About 175 days separate Rockland's last and first frost, putting it 26,862 of 40,283 ZIP codes nationally. Within ME, it ranks 72 of 456.
Learn more
local microclimates explains what one yard in Rockland can differ from the 04864 normal, and zone vs. frost date explains why Zone 5b and Rockland's frost date answer different questions.