Cimarron, NM 87729 Frost Dates
87729, near Cimarron, NM: the frost window
Around 05/11 is the usual last spring frost, about 256 days away. Fall's first freeze usually shows up around 10/03, roughly 143 days after the last spring frost.
Cimarron 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.
Stretching the season past the first frost
Cimarron's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/11 isn't a guarantee
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Cimarron against the rest of the dataset
At roughly 143 frost-free days, Cimarron places 36,570 of 40,283 ZIP codes in this dataset. Within NM, it ranks 318 of 427.
Learn more
Two guides worth reading on 87729: zone vs. frost date, on why Zone 6a and Cimarron's frost date answer different questions, and the frost range, on how to read the range around Cimarron's dates instead of trusting one.