Superior, CO 80025 Frost Dates
When can you plant in Superior, CO?
The last spring frost here typically falls around 05/24, about 269 days from today. The first fall frost typically arrives around 09/23, about 120 frost-free days later.
The USDA Plant Hardiness Zone Map puts Superior in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 4 weeks of growing season left in Superior before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/24 is the middle of 30 years of NOAA records, not a promise. Plant by 05/11 and you're betting against frost in roughly 9 years out of 10. 06/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Superior compares
At roughly 120 frost-free days, Superior places 39,071 of 40,283 ZIP codes in this dataset. Within CO, it ranks 459 of 624.
Learn more
zone vs. frost date covers why Zone 6a and Superior's frost date answer different questions. the frost range covers how to read the range around Superior's dates instead of trusting one.