Hartland, MN 56042 Frost Dates
Frost dates for Hartland, MN, ZIP 56042
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/06, about 158 frost-free days later.
Zone 5a (-20 to -15°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 Hartland, not a forecast for this year.
What to do before the first frost
Zone 5a around Hartland has about 6 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.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 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 Hartland compares
About 158 days separate Hartland's last and first frost, putting it 33,132 of 40,283 ZIP codes nationally. Within MN, it ranks 294 of 943.
Learn more
the frost range explains how to read the range around Hartland's dates instead of trusting one, and local microclimates explains what one yard in Hartland can differ from the 56042 normal.