Riverside, WY 82325 Frost Dates
Riverside, WY: when does the frost end?
Around 06/12 is the usual last spring frost, about 288 days away. Fall's first freeze usually shows up around 09/07, roughly 83 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Riverside 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 1 week until Riverside's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Riverside's last frost
06/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/30 and only about 1 year in 10 sees frost after that.
Riverside against the rest of the dataset
About 83 days separate Riverside's last and first frost, putting it 40,032 of 40,283 ZIP codes nationally. Within WY, it ranks 159 of 192.
Learn more
Before leaning on 82325's figures: zone vs. frost date explains why Zone 5a and Riverside's frost date answer different questions, while the frost range explains how to read the range around Riverside's dates instead of trusting one.