Arvada, CO 80004 Frost Dates
Arvada, CO: when does the frost end?
Around 05/05 is the usual last spring frost, about 250 days away. Fall's first freeze usually shows up around 10/05, roughly 151 days after the last spring frost.
Zone 6a (-10 to -5°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 Arvada, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Arvada's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Arvada against the rest of the dataset
At roughly 151 frost-free days, Arvada places 34,930 of 40,283 ZIP codes in this dataset. Within CO, it ranks 300 of 624.
Learn more
Before leaning on 80004's figures: local microclimates explains what one yard in Arvada can differ from the 80004 normal, while zone vs. frost date explains why Zone 6a and Arvada's frost date answer different questions.