Silver Plume, CO 80444 Frost Dates
Silver Plume, CO: when does the frost end?
Around 05/30 is the usual last spring frost, about 275 days away. Fall's first freeze usually shows up around 09/19, roughly 112 days after the last spring frost.
Silver Plume sits in USDA Zone 5a (-20 to -15°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 3 weeks until Silver Plume's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/30 isn't a guarantee
05/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/14 and only about 1 year in 10 sees frost after that.
Silver Plume against the rest of the dataset
About 112 days separate Silver Plume's last and first frost, putting it 39,444 of 40,283 ZIP codes nationally. Within CO, it ranks 504 of 624.
Learn more
Before leaning on 80444's figures: local microclimates explains what one yard in Silver Plume can differ from the 80444 normal, while zone vs. frost date explains why Zone 5a and Silver Plume's frost date answer different questions.