Glenrock, WY 82637 Frost Dates
Glenrock, WY: when does the frost end?
Typically, the last spring freeze lands around 05/12, roughly 257 days out. Fall's first freeze usually shows up around 10/01, roughly 143 days after the last spring frost.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Glenrock, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Glenrock's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Glenrock's last frost
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Glenrock against the rest of the dataset
Glenrock's growing season runs about 143 days, ranking 36,545 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 17 of 192.
Learn more
Before leaning on 82637's figures: local microclimates explains what one yard in Glenrock can differ from the 82637 normal, while zone vs. frost date explains why Zone 5a and Glenrock's frost date answer different questions.