Hill City, MN 55785 Frost Dates
Frost dates for Hill City, MN, ZIP 55785
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 10/03, about 148 frost-free days later.
Hill City 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.
What to do before the first frost
Zone 4a around Hill City 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.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hill City compares
About 148 days separate Hill City's last and first frost, putting it 35,774 of 40,283 ZIP codes nationally. Within MN, it ranks 590 of 943.
Learn more
local microclimates explains what one yard in Hill City can differ from the 55785 normal, and zone vs. frost date explains why Zone 4a and Hill City's frost date answer different questions.