Henriette, MN 55030 Frost Dates
Frost dates for Henriette, MN, ZIP 55030
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 09/30, about 142 frost-free days later.
Henriette sits in USDA Zone 4a (-30 to -25°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
Zone 4a around Henriette has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Henriette compares
Henriette's growing season runs about 142 days, ranking 36,846 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 705 of 943.
Learn more
the frost range explains how to read the range around Henriette's dates instead of trusting one, and local microclimates explains what one yard in Henriette can differ from the 55030 normal.