Mechanicsville, IA 52306 Frost Dates
52306, near Mechanicsville, IA: the frost window
Typically, the last spring freeze lands around 04/27, roughly 242 days out. Fall's first freeze usually shows up around 10/13, roughly 170 days after the last spring frost.
Zone 5a (-20 to -15°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 Mechanicsville, not a forecast for this year.
Stretching the season past the first frost
Mechanicsville's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Mechanicsville's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Mechanicsville against the rest of the dataset
At roughly 170 frost-free days, Mechanicsville places 29,124 of 40,283 ZIP codes in this dataset. Within IA, it ranks 307 of 1,042.
Learn more
Two guides worth reading on 52306: local microclimates, on what one yard in Mechanicsville can differ from the 52306 normal, and zone vs. frost date, on why Zone 5a and Mechanicsville's frost date answer different questions.