Knollwood, TX 75091 Frost Dates
75091, near Knollwood, TX: the frost window
Typically, the last spring freeze lands around 03/14, roughly 198 days out. Fall's first freeze usually shows up around 11/19, roughly 250 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Knollwood in Zone 8a (10 to 15°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
Knollwood's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Knollwood's last frost
03/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/01 and only about 1 year in 10 sees frost after that.
Knollwood against the rest of the dataset
At roughly 250 frost-free days, Knollwood places 7,570 of 40,283 ZIP codes in this dataset. Within TX, it ranks 1,696 of 2,558.
Learn more
Two guides worth reading on 75091: the frost range, on how to read the range around Knollwood's dates instead of trusting one, and local microclimates, on what one yard in Knollwood can differ from the 75091 normal.