Maple Plain, MN 55359 Frost Dates
Frost dates for Maple Plain, MN, ZIP 55359
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/08, about 159 frost-free days later.
Maple Plain 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 Maple Plain 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.
How much risk comes with planting early here
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 Maple Plain compares
At roughly 159 frost-free days, Maple Plain places 32,681 of 40,283 ZIP codes in this dataset. Within MN, it ranks 261 of 943.
Learn more
local microclimates explains what one yard in Maple Plain can differ from the 55359 normal, and zone vs. frost date explains why Zone 4b and Maple Plain's frost date answer different questions.