Plymouth, MN 55446 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 5a (-20 to -15°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
About 163 days separate Plymouth's last and first frost, putting it 31,281 of 40,283 ZIP codes nationally. Within MN, it ranks 126 of 943.
Learn more
Before leaning on 55446's figures: zone vs. frost date explains why Zone 5a and Plymouth's frost date answer different questions, while the frost range explains how to read the range around Plymouth's dates instead of trusting one.