Dundas, MN 55019 Frost Dates
Frost dates for Dundas, MN, ZIP 55019
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 10/05, about 152 frost-free days later.
The USDA Plant Hardiness Zone Map puts Dundas in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 4b around Dundas 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.
Why 05/05 isn't a guarantee
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 Dundas compares
At roughly 152 frost-free days, Dundas places 34,789 of 40,283 ZIP codes in this dataset. Within MN, it ranks 445 of 943.
Learn more
the frost range explains how to read the range around Dundas's dates instead of trusting one, and local microclimates explains what one yard in Dundas can differ from the 55019 normal.