Glendale, CO 80290 Frost Dates
Glendale, CO: when does the frost end?
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/12, roughly 165 days after the last spring frost.
Glendale sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 6 weeks until Glendale's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Glendale against the rest of the dataset
Glendale's growing season runs about 165 days, ranking 30,563 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 58 of 624.
Learn more
Before leaning on 80290's figures: local microclimates explains what one yard in Glendale can differ from the 80290 normal, while zone vs. frost date explains why Zone 6a and Glendale's frost date answer different questions.