Alamo, TX 78516 Frost Dates
78516, near Alamo, TX: the frost window
The last spring frost here typically falls around 01/09, about 134 days from today. Fall's first freeze usually shows up around 01/03, roughly 365 days after the last spring frost.
Zone 10a (30 to 35°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 Alamo, not a forecast for this year.
Stretching the season past the first frost
Alamo's growing season runs out in roughly 18 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
01/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/17 and only about 1 year in 10 sees frost after that.
Alamo against the rest of the dataset
At roughly 365 frost-free days, Alamo places 1,239 of 40,283 ZIP codes in this dataset. Within TX, it ranks 25 of 2,558.
Learn more
Two guides worth reading on 78516: zone vs. frost date, on why Zone 10a and Alamo's frost date answer different questions, and the frost range, on how to read the range around Alamo's dates instead of trusting one.