Randolph, IA 51649 Frost Dates
Randolph, IA: when does the frost end?
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/19, roughly 182 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Randolph in Zone 5b (-15 to -10°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 Randolph's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Randolph's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/02 and only about 1 year in 10 sees frost after that.
Randolph against the rest of the dataset
Randolph's growing season runs about 182 days, ranking 24,342 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 84 of 1,042.
Learn more
Before leaning on 51649's figures: local microclimates explains what one yard in Randolph can differ from the 51649 normal, while zone vs. frost date explains why Zone 5b and Randolph's frost date answer different questions.