Halma, MN 56729 Frost Dates
Halma, MN: when does the frost end?
Typically, the last spring freeze lands around 05/08, roughly 253 days out. Fall's first freeze usually shows up around 09/30, roughly 142 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Halma in Zone 3b (-35 to -30°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
With roughly 5 weeks until Halma's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/24 and only about 1 year in 10 sees frost after that.
Halma against the rest of the dataset
About 142 days separate Halma's last and first frost, putting it 36,848 of 40,283 ZIP codes nationally. Within MN, it ranks 707 of 943.
Learn more
Before leaning on 56729's figures: local microclimates explains what one yard in Halma can differ from the 56729 normal, while zone vs. frost date explains why Zone 3b and Halma's frost date answer different questions.