Plymouth, MN 55572 Frost Dates
Plymouth, MN: when does the frost end?
The last spring frost here typically falls around 04/29, about 244 days from today. Fall's first freeze usually shows up around 10/12, roughly 163 days after the last spring frost.
Zone 4b (-25 to -20°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 Plymouth, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Plymouth's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Plymouth's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Plymouth against the rest of the dataset
At roughly 163 frost-free days, Plymouth places 31,298 of 40,283 ZIP codes in this dataset. Within MN, it ranks 143 of 943.
Learn more
Before leaning on 55572's figures: the frost range explains how to read the range around Plymouth's dates instead of trusting one, while local microclimates explains what one yard in Plymouth can differ from the 55572 normal.