Hewitt, MN 56453 Frost Dates
56453, near Hewitt, MN: the frost window
The last spring frost here typically falls around 05/10, about 255 days from today. Fall's first freeze usually shows up around 09/30, roughly 141 days after the last spring frost.
Zone 4a (-30 to -25°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 Hewitt, not a forecast for this year.
Stretching the season past the first frost
Hewitt's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Hewitt against the rest of the dataset
About 141 days separate Hewitt's last and first frost, putting it 36,990 of 40,283 ZIP codes nationally. Within MN, it ranks 728 of 943.
Learn more
Two guides worth reading on 56453: local microclimates, on what one yard in Hewitt can differ from the 56453 normal, and zone vs. frost date, on why Zone 4a and Hewitt's frost date answer different questions.