Myrtle, MN 56036 Frost Dates
When can you plant in Myrtle, MN?
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/09, about 164 frost-free days later.
Myrtle sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 6 weeks of growing season left in Myrtle before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Myrtle compares
Myrtle's growing season runs about 164 days, ranking 31,264 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 123 of 943.
Learn more
local microclimates covers what one yard in Myrtle can differ from the 56036 normal. zone vs. frost date covers why Zone 5a and Myrtle's frost date answer different questions.