Good Thunder, MN 56037 Frost Dates
When can you plant in Good Thunder, MN?
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/09, about 161 frost-free days later.
Good Thunder 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
About 6 weeks of growing season left in Good Thunder before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 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 Good Thunder compares
About 161 days separate Good Thunder's last and first frost, putting it 32,129 of 40,283 ZIP codes nationally. Within MN, it ranks 207 of 943.
Learn more
the frost range covers how to read the range around Good Thunder's dates instead of trusting one. local microclimates covers what one yard in Good Thunder can differ from the 56037 normal.