Medicine Lake, MN 55441 Frost Dates
Frost dates for Medicine Lake, MN, ZIP 55441
Around 04/29 is the usual last spring frost, about 244 days away. The first fall frost typically arrives around 10/12, about 163 frost-free days later.
Medicine Lake sits in USDA Zone 5a (-20 to -15°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 5a around Medicine Lake 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.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Medicine Lake compares
Medicine Lake's growing season runs about 163 days, ranking 31,435 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 168 of 943.
Learn more
the frost range explains how to read the range around Medicine Lake's dates instead of trusting one, and local microclimates explains what one yard in Medicine Lake can differ from the 55441 normal.