Holland, IA 50642 Frost Dates
Holland, IA: when does the frost end?
The last spring frost here typically falls around 04/29, about 244 days from today. Fall's first freeze usually shows up around 10/09, roughly 160 days after the last spring frost.
Holland sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 6 weeks until Holland's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Holland against the rest of the dataset
At roughly 160 frost-free days, Holland places 32,518 of 40,283 ZIP codes in this dataset. Within IA, it ranks 765 of 1,042.
Learn more
Before leaning on 50642's figures: zone vs. frost date explains why Zone 5a and Holland's frost date answer different questions, while the frost range explains how to read the range around Holland's dates instead of trusting one.