Silt, CO 81652 Frost Dates
When can you plant in Silt, CO?
Typically, the last spring freeze lands around 05/11, roughly 256 days out. The first fall frost typically arrives around 10/04, about 143 frost-free days later.
Silt 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 5 weeks of growing season left in Silt before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Silt's last frost
05/11 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Silt compares
Silt's growing season runs about 143 days, ranking 36,522 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 382 of 624.
Learn more
zone vs. frost date covers why Zone 6a and Silt's frost date answer different questions. the frost range covers how to read the range around Silt's dates instead of trusting one.