San Ysidro, NM 87046 Frost Dates
San Ysidro, NM: when does the frost end?
Around 05/15 is the usual last spring frost, about 260 days away. Fall's first freeze usually shows up around 10/05, roughly 143 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts San Ysidro in Zone 5b (-15 to -10°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
With roughly 5 weeks until San Ysidro's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/15 isn't a guarantee
05/15 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 06/02 and only about 1 year in 10 sees frost after that.
San Ysidro against the rest of the dataset
At roughly 143 frost-free days, San Ysidro places 36,656 of 40,283 ZIP codes in this dataset. Within NM, it ranks 322 of 427.
Learn more
Before leaning on 87046's figures: local microclimates explains what one yard in San Ysidro can differ from the 87046 normal, while zone vs. frost date explains why Zone 5b and San Ysidro's frost date answer different questions.