Lake Crystal, MN 56055 Frost Dates
Frost dates for Lake Crystal, MN, ZIP 56055
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/09, about 161 frost-free days later.
The USDA Plant Hardiness Zone Map puts Lake Crystal in Zone 5a (-20 to -15°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
Zone 5a around Lake Crystal 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. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lake Crystal compares
About 161 days separate Lake Crystal's last and first frost, putting it 32,058 of 40,283 ZIP codes nationally. Within MN, it ranks 202 of 943.
Learn more
the frost range explains how to read the range around Lake Crystal's dates instead of trusting one, and local microclimates explains what one yard in Lake Crystal can differ from the 56055 normal.