Richfield, UT 84701 Frost Dates
Richfield, UT: when does the frost end?
Typically, the last spring freeze lands around 05/21, roughly 266 days out. Fall's first freeze usually shows up around 09/24, roughly 125 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Richfield in Zone 6a (-10 to -5°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 4 weeks until Richfield'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
05/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/07 and only about 1 year in 10 sees frost after that.
Richfield against the rest of the dataset
About 125 days separate Richfield's last and first frost, putting it 38,754 of 40,283 ZIP codes nationally. Within UT, it ranks 259 of 344.
Learn more
Before leaning on 84701's figures: local microclimates explains what one yard in Richfield can differ from the 84701 normal, while zone vs. frost date explains why Zone 6a and Richfield's frost date answer different questions.