Franklin, MN 55333 Frost Dates
55333, near Franklin, MN: the frost window
The last spring frost here typically falls around 04/30, about 245 days from today. Fall's first freeze usually shows up around 10/04, roughly 157 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 Franklin, not a forecast for this year.
Stretching the season past the first frost
Franklin'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 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Franklin against the rest of the dataset
At roughly 157 frost-free days, Franklin places 33,421 of 40,283 ZIP codes in this dataset. Within MN, it ranks 307 of 943.
Learn more
Two guides worth reading on 55333: zone vs. frost date, on why Zone 4b and Franklin's frost date answer different questions, and the frost range, on how to read the range around Franklin's dates instead of trusting one.