Garnavillo, IA 52049 Frost Dates
Garnavillo, 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 10/18, roughly 178 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Garnavillo in Zone 5a (-20 to -15°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 7 weeks until Garnavillo'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
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Garnavillo against the rest of the dataset
Garnavillo's growing season runs about 178 days, ranking 25,846 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 114 of 1,042.
Learn more
Before leaning on 52049's figures: zone vs. frost date explains why Zone 5a and Garnavillo's frost date answer different questions, while the frost range explains how to read the range around Garnavillo's dates instead of trusting one.