Trommald, MN 56465 Frost Dates
56465, near Trommald, MN: the frost window
The last spring frost here typically falls around 05/13, about 258 days from today. Fall's first freeze usually shows up around 09/27, roughly 138 days after the last spring frost.
Trommald sits in USDA Zone 4a (-30 to -25°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
Trommald's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/13 isn't a guarantee
05/13 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 05/27 and only about 1 year in 10 sees frost after that.
Trommald against the rest of the dataset
Trommald's growing season runs about 138 days, ranking 37,473 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 777 of 943.
Learn more
Two guides worth reading on 56465: the frost range, on how to read the range around Trommald's dates instead of trusting one, and local microclimates, on what one yard in Trommald can differ from the 56465 normal.