Plymouth, MN 55323 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.
Plymouth sits in USDA Zone 4b (-25 to -20°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.
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.
How much risk comes with planting early here
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 31,279 of 40,283 ZIP codes in this dataset. Within MN, it ranks 124 of 943.
Learn more
Before leaning on 55323's figures: local microclimates explains what one yard in Plymouth can differ from the 55323 normal, while zone vs. frost date explains why Zone 4b and Plymouth's frost date answer different questions.