Glendale, CO 80273 Frost Dates
When can you plant in Glendale, CO?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/12, about 165 frost-free days later.
Zone 6a (-10 to -5°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 Glendale, not a forecast for this year.
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.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Glendale compares
About 165 days separate Glendale's last and first frost, putting it 30,560 of 40,283 ZIP codes nationally. Within CO, it ranks 55 of 624.
Learn more
local microclimates covers what one yard in Glendale can differ from the 80273 normal. zone vs. frost date covers why Zone 6a and Glendale's frost date answer different questions.