Elk River, MN 55330 Frost Dates
Frost dates for Elk River, MN, ZIP 55330
The last spring frost here typically falls around 05/04, about 249 days from today. The first fall frost typically arrives around 10/05, about 154 frost-free days later.
Elk River 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 Elk River 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 05/04 isn't a guarantee
05/04 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. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Elk River compares
About 154 days separate Elk River's last and first frost, putting it 34,210 of 40,283 ZIP codes nationally. Within MN, it ranks 378 of 943.
Learn more
the frost range explains how to read the range around Elk River's dates instead of trusting one, and local microclimates explains what one yard in Elk River can differ from the 55330 normal.