Foreston, MN 56330 Frost Dates
Frost dates for Foreston, MN, ZIP 56330
The last spring frost here typically falls around 05/08, about 253 days from today. The first fall frost typically arrives around 10/01, about 143 frost-free days later.
The USDA Plant Hardiness Zone Map puts Foreston in Zone 4a (-30 to -25°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 4a around Foreston 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
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Foreston compares
Foreston's growing season runs about 143 days, ranking 36,584 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 679 of 943.
Learn more
zone vs. frost date explains why Zone 4a and Foreston's frost date answer different questions, and the frost range explains how to read the range around Foreston's dates instead of trusting one.