Riley, KS 66505 Frost Dates
Riley, KS: when does the frost end?
Around 04/22 is the usual last spring frost, about 237 days away. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Riley in Zone 6b (-5 to 0°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 8 weeks until Riley's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Riley's last frost
04/22 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 05/05 and only about 1 year in 10 sees frost after that.
Riley against the rest of the dataset
About 179 days separate Riley's last and first frost, putting it 25,400 of 40,283 ZIP codes nationally. Within KS, it ranks 553 of 745.
Learn more
Before leaning on 66505's figures: zone vs. frost date explains why Zone 6b and Riley's frost date answer different questions, while the frost range explains how to read the range around Riley's dates instead of trusting one.