Fort Lupton, CO 80621 Frost Dates
Fort Lupton, CO: when does the frost end?
Around 05/03 is the usual last spring frost, about 248 days away. Fall's first freeze usually shows up around 10/07, roughly 155 days after the last spring frost.
Zone 5b (-15 to -10°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 Fort Lupton, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Fort Lupton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Fort Lupton's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Fort Lupton against the rest of the dataset
At roughly 155 frost-free days, Fort Lupton places 33,939 of 40,283 ZIP codes in this dataset. Within CO, it ranks 247 of 624.
Learn more
Before leaning on 80621's figures: local microclimates explains what one yard in Fort Lupton can differ from the 80621 normal, while zone vs. frost date explains why Zone 5b and Fort Lupton's frost date answer different questions.