Hillman, MN 56338 Frost Dates
Hillman, MN: when does the frost end?
The last spring frost here typically falls around 05/04, about 249 days from today. Fall's first freeze usually shows up around 10/05, roughly 151 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 Hillman, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Hillman'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
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Hillman against the rest of the dataset
Hillman's growing season runs about 151 days, ranking 35,222 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 511 of 943.
Learn more
Before leaning on 56338's figures: local microclimates explains what one yard in Hillman can differ from the 56338 normal, while zone vs. frost date explains why Zone 4a and Hillman's frost date answer different questions.