Gypsum, CO 81637 Frost Dates
When can you plant in Gypsum, CO?
Around 05/13 is the usual last spring frost, about 258 days away. The first fall frost typically arrives around 10/03, about 142 frost-free days later.
Zone 5b (-15 to -10°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 Gypsum, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Gypsum before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Gypsum's last frost
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Gypsum compares
At roughly 142 frost-free days, Gypsum places 36,716 of 40,283 ZIP codes in this dataset. Within CO, it ranks 392 of 624.
Learn more
the frost range covers how to read the range around Gypsum's dates instead of trusting one. local microclimates covers what one yard in Gypsum can differ from the 81637 normal.