Grygla, MN 56727 Frost Dates
When can you plant in Grygla, MN?
Typically, the last spring freeze lands around 05/24, roughly 269 days out. The first fall frost typically arrives around 09/20, about 120 frost-free days later.
Zone 3b (-35 to -30°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 Grygla, not a forecast for this year.
What to do before the first frost
About 3 weeks of growing season left in Grygla before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/24 isn't a guarantee
05/24 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 06/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grygla compares
At roughly 120 frost-free days, Grygla places 39,107 of 40,283 ZIP codes in this dataset. Within MN, it ranks 881 of 943.
Learn more
local microclimates covers what one yard in Grygla can differ from the 56727 normal. zone vs. frost date covers why Zone 3b and Grygla's frost date answer different questions.