Glendale, CO 80220 Frost Dates
When can you plant in Glendale, CO?
Typically, the last spring freeze lands around 05/04, roughly 249 days out. The first fall frost typically arrives around 10/08, about 156 frost-free days later.
The USDA Plant Hardiness Zone Map puts Glendale 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 6 weeks of growing season left in Glendale before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Glendale's last frost
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Glendale compares
About 156 days separate Glendale's last and first frost, putting it 33,577 of 40,283 ZIP codes nationally. Within CO, it ranks 197 of 624.
Learn more
local microclimates covers what one yard in Glendale can differ from the 80220 normal. zone vs. frost date covers why Zone 6a and Glendale's frost date answer different questions.