Grand Junction, CO 81501 Frost Dates
Frost dates for Grand Junction, CO, ZIP 81501
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/16, about 171 frost-free days later.
Grand Junction sits in USDA Zone 7a (0 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
Zone 7a around Grand Junction has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 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 Grand Junction compares
At roughly 171 frost-free days, Grand Junction places 28,578 of 40,283 ZIP codes in this dataset. Within CO, it ranks 18 of 624.
Learn more
local microclimates explains what one yard in Grand Junction can differ from the 81501 normal, and zone vs. frost date explains why Zone 7a and Grand Junction's frost date answer different questions.