Clarkfield, MN 56223 Frost Dates
When can you plant in Clarkfield, MN?
Around 05/04 is the usual last spring frost, about 249 days away. The first fall frost typically arrives around 10/01, about 149 frost-free days later.
Clarkfield 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
About 5 weeks of growing season left in Clarkfield before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Clarkfield's last frost
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. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Clarkfield compares
About 149 days separate Clarkfield's last and first frost, putting it 35,548 of 40,283 ZIP codes nationally. Within MN, it ranks 567 of 943.
Learn more
local microclimates covers what one yard in Clarkfield can differ from the 56223 normal. zone vs. frost date covers why Zone 4b and Clarkfield's frost date answer different questions.