Boyd, MN 56218 Frost Dates
56218, near Boyd, MN: the frost window
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/01, roughly 149 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Boyd in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Boyd's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Boyd against the rest of the dataset
Boyd's growing season runs about 149 days, ranking 35,588 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 571 of 943.
Learn more
Two guides worth reading on 56218: local microclimates, on what one yard in Boyd can differ from the 56218 normal, and zone vs. frost date, on why Zone 4b and Boyd's frost date answer different questions.