Nederland, CO 80466 Frost Dates
Nederland, CO: when does the frost end?
Typically, the last spring freeze lands around 06/21, roughly 297 days out. Fall's first freeze usually shows up around 09/02, roughly 71 days after the last spring frost.
Nederland sits in USDA Zone 5b (-15 to -10°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 1 week until Nederland's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 06/21 isn't a guarantee
06/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 06/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/04 and only about 1 year in 10 sees frost after that.
Nederland against the rest of the dataset
Nederland's growing season runs about 71 days, ranking 40,113 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 576 of 624.
Learn more
Before leaning on 80466's figures: local microclimates explains what one yard in Nederland can differ from the 80466 normal, while zone vs. frost date explains why Zone 5b and Nederland's frost date answer different questions.