Walnut Grove, MN 56180 Frost Dates
When can you plant in Walnut Grove, MN?
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/02, about 152 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 Walnut Grove, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Walnut Grove before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Walnut Grove's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Walnut Grove compares
Walnut Grove's growing season runs about 152 days, ranking 34,836 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 458 of 943.
Learn more
local microclimates covers what one yard in Walnut Grove can differ from the 56180 normal. zone vs. frost date covers why Zone 5a and Walnut Grove's frost date answer different questions.