Marysville, IA 50116 Frost Dates
Marysville, IA: when does the frost end?
Around 04/21 is the usual last spring frost, about 236 days away. Fall's first freeze usually shows up around 10/16, roughly 176 days after the last spring frost.
Zone 5b (-15 to -10°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 Marysville, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Marysville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Marysville's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/04 and only about 1 year in 10 sees frost after that.
Marysville against the rest of the dataset
Marysville's growing season runs about 176 days, ranking 26,685 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 168 of 1,042.
Learn more
Before leaning on 50116's figures: the frost range explains how to read the range around Marysville's dates instead of trusting one, while local microclimates explains what one yard in Marysville can differ from the 50116 normal.