Ruidoso, NM 88340 Frost Dates
88340, near Ruidoso, NM: the frost window
Typically, the last spring freeze lands around 05/18, roughly 263 days out. Fall's first freeze usually shows up around 10/01, roughly 134 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Ruidoso in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Ruidoso'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 05/18 isn't a guarantee
05/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Ruidoso against the rest of the dataset
Ruidoso's growing season runs about 134 days, ranking 37,953 of 40,283 US ZIP codes measured here, longest to shortest. Within NM, it ranks 355 of 427.
Learn more
Two guides worth reading on 88340: local microclimates, on what one yard in Ruidoso can differ from the 88340 normal, and zone vs. frost date, on why Zone 7a and Ruidoso's frost date answer different questions.