Hillman, MN 56388 Frost Dates
Frost dates for Hillman, MN, ZIP 56388
Around 05/08 is the usual last spring frost, about 253 days away. The first fall frost typically arrives around 10/01, about 143 frost-free days later.
Zone 4b (-25 to -20°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.
What to do before the first frost
Zone 4b around Hillman has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Hillman's last frost
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hillman compares
Hillman's growing season runs about 143 days, ranking 36,689 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 690 of 943.
Learn more
local microclimates explains what one yard in Hillman can differ from the 56388 normal, and zone vs. frost date explains why Zone 4b and Hillman's frost date answer different questions.