South Fork, CO 81154 Frost Dates
South Fork, CO: when does the frost end?
The last spring frost here typically falls around 05/23, about 268 days from today. Fall's first freeze usually shows up around 09/25, roughly 123 days after the last spring frost.
South Fork 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 4 weeks until South Fork's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/08 and only about 1 year in 10 sees frost after that.
South Fork against the rest of the dataset
At roughly 123 frost-free days, South Fork places 38,916 of 40,283 ZIP codes in this dataset. Within CO, it ranks 458 of 624.
Learn more
Before leaning on 81154's figures: the frost range explains how to read the range around South Fork's dates instead of trusting one, while local microclimates explains what one yard in South Fork can differ from the 81154 normal.