Spring Valley, MN 55975 Frost Dates
Spring Valley, MN: when does the frost end?
The last spring frost here typically falls around 05/06, about 251 days from today. Fall's first freeze usually shows up around 10/01, roughly 146 days after the last spring frost.
Zone 4b (-25 to -20°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 Spring Valley, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Spring Valley's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Spring Valley's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Spring Valley against the rest of the dataset
At roughly 146 frost-free days, Spring Valley places 36,053 of 40,283 ZIP codes in this dataset. Within MN, it ranks 616 of 943.
Learn more
Before leaning on 55975's figures: zone vs. frost date explains why Zone 4b and Spring Valley's frost date answer different questions, while the frost range explains how to read the range around Spring Valley's dates instead of trusting one.