Comfrey, MN 56019 Frost Dates
56019, near Comfrey, MN: the frost window
Typically, the last spring freeze lands around 05/04, roughly 249 days out. Fall's first freeze usually shows up around 10/01, roughly 150 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Comfrey in Zone 5a (-20 to -15°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
Comfrey'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.
How much risk comes with planting early here
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Comfrey against the rest of the dataset
About 150 days separate Comfrey's last and first frost, putting it 35,389 of 40,283 ZIP codes nationally. Within MN, it ranks 534 of 943.
Learn more
Two guides worth reading on 56019: zone vs. frost date, on why Zone 5a and Comfrey's frost date answer different questions, and the frost range, on how to read the range around Comfrey's dates instead of trusting one.