Morristown, MN 55087 Frost Dates
Frost dates for Morristown, MN, ZIP 55087
The last spring frost here typically falls around 05/05, about 250 days from today. The first fall frost typically arrives around 10/05, about 152 frost-free days later.
Morristown sits in USDA Zone 4b (-25 to -20°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 4b around Morristown 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 Morristown's last frost
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Morristown compares
At roughly 152 frost-free days, Morristown places 34,812 of 40,283 ZIP codes in this dataset. Within MN, it ranks 451 of 943.
Learn more
the frost range explains how to read the range around Morristown's dates instead of trusting one, and local microclimates explains what one yard in Morristown can differ from the 55087 normal.