Rockford, MN 55373 Frost Dates
When can you plant in Rockford, MN?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/08, about 159 frost-free days later.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Rockford, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Rockford before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Rockford's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rockford compares
At roughly 159 frost-free days, Rockford places 32,644 of 40,283 ZIP codes in this dataset. Within MN, it ranks 252 of 943.
Learn more
the frost range covers how to read the range around Rockford's dates instead of trusting one. local microclimates covers what one yard in Rockford can differ from the 55373 normal.