Rockland, ME 04847 Frost Dates
04847, near Rockland, ME: the frost window
Typically, the last spring freeze lands around 04/27, roughly 242 days out. Fall's first freeze usually shows up around 10/19, roughly 175 days after the last spring frost.
Zone 5b (-15 to -10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Rockland, not a forecast for this year.
Stretching the season past the first frost
Rockland's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Rockland's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Rockland against the rest of the dataset
At roughly 175 frost-free days, Rockland places 26,857 of 40,283 ZIP codes in this dataset. Within ME, it ranks 67 of 456.
Learn more
Two guides worth reading on 04847: the frost range, on how to read the range around Rockland's dates instead of trusting one, and local microclimates, on what one yard in Rockland can differ from the 04847 normal.