San Luis, CO 87512 Frost Dates
87512, near San Luis, CO: the frost window
The last spring frost here typically falls around 06/16, about 292 days from today. Fall's first freeze usually shows up around 09/14, roughly 87 days after the last spring frost.
Zone 6a (-10 to -5°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 San Luis, not a forecast for this year.
Stretching the season past the first frost
San Luis's growing season runs out in roughly 2 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
06/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 06/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/05 and only about 1 year in 10 sees frost after that.
San Luis against the rest of the dataset
San Luis's growing season runs about 87 days, ranking 39,966 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 557 of 624.
Learn more
Two guides worth reading on 87512: the frost range, on how to read the range around San Luis's dates instead of trusting one, and local microclimates, on what one yard in San Luis can differ from the 87512 normal.