Montrose, MN 55363 Frost Dates
Frost dates for Montrose, MN, ZIP 55363
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/08, about 159 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 Montrose, not a forecast for this year.
What to do before the first frost
Zone 4b around Montrose has about 6 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.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Montrose compares
At roughly 159 frost-free days, Montrose places 32,647 of 40,283 ZIP codes in this dataset. Within MN, it ranks 254 of 943.
Learn more
zone vs. frost date explains why Zone 4b and Montrose's frost date answer different questions, and the frost range explains how to read the range around Montrose's dates instead of trusting one.