Aldrich, MN 56434 Frost Dates
When can you plant in Aldrich, MN?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. The first fall frost typically arrives around 09/30, about 141 frost-free days later.
The USDA Plant Hardiness Zone Map puts Aldrich in Zone 4a (-30 to -25°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 Aldrich before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Aldrich's last frost
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/29 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Aldrich compares
At roughly 141 frost-free days, Aldrich places 37,017 of 40,283 ZIP codes in this dataset. Within MN, it ranks 734 of 943.
Learn more
zone vs. frost date covers why Zone 4a and Aldrich's frost date answer different questions. the frost range covers how to read the range around Aldrich's dates instead of trusting one.