Silver Plume, CO 80476 Frost Dates
Frost dates for Silver Plume, CO, ZIP 80476
Typically, the last spring freeze lands around 05/30, roughly 275 days out. The first fall frost typically arrives around 09/19, about 112 frost-free days later.
The USDA Plant Hardiness Zone Map puts Silver Plume in Zone 5a (-20 to -15°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
Zone 5a around Silver Plume has about 3 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 05/30 isn't a guarantee
05/30 is the middle of 30 years of NOAA records, not a promise. Plant by 05/17 and you're betting against frost in roughly 9 years out of 10. 06/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Silver Plume compares
About 112 days separate Silver Plume's last and first frost, putting it 39,445 of 40,283 ZIP codes nationally. Within CO, it ranks 505 of 624.
Learn more
the frost range explains how to read the range around Silver Plume's dates instead of trusting one, and local microclimates explains what one yard in Silver Plume can differ from the 80476 normal.