Magnolia, MN 56158 Frost Dates
When can you plant in Magnolia, MN?
Around 05/01 is the usual last spring frost, about 246 days away. The first fall frost typically arrives around 10/04, about 156 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 Magnolia, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Magnolia before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Magnolia compares
Magnolia's growing season runs about 156 days, ranking 33,857 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 337 of 943.
Learn more
local microclimates covers what one yard in Magnolia can differ from the 56158 normal. zone vs. frost date covers why Zone 5a and Magnolia's frost date answer different questions.