Northglenn, CO 80234 Frost Dates
When can you plant in Northglenn, CO?
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/11, about 160 frost-free days later.
Northglenn sits in USDA Zone 6a (-10 to -5°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.
What to do before the first frost
About 6 weeks of growing season left in Northglenn before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Northglenn's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Northglenn compares
At roughly 160 frost-free days, Northglenn places 32,232 of 40,283 ZIP codes in this dataset. Within CO, it ranks 92 of 624.
Learn more
the frost range covers how to read the range around Northglenn's dates instead of trusting one. local microclimates covers what one yard in Northglenn can differ from the 80234 normal.