Hoffman, MN 56339 Frost Dates
When can you plant in Hoffman, MN?
Typically, the last spring freeze lands around 05/04, roughly 249 days out. The first fall frost typically arrives around 10/01, about 150 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hoffman in Zone 4b (-25 to -20°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
About 5 weeks of growing season left in Hoffman before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 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 Hoffman compares
Hoffman's growing season runs about 150 days, ranking 35,357 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 529 of 943.
Learn more
zone vs. frost date covers why Zone 4b and Hoffman's frost date answer different questions. the frost range covers how to read the range around Hoffman's dates instead of trusting one.