SAN ANTONIO – Warm temperatures can delay fall colors until mid-to-late November in South Texas, but residents don’t have to travel far to enjoy the seasonal display.
Many Texans look to the fall season for relief from the summer heat, but we’re not the only ones. Trees also anticipate cooler temperatures to signal the beginning of their turn from green leaves to dreamy displays of fall foliage.
The Science of the Color Change
Leaves stay green during the growing season because they contain chlorophyll, a pigment that helps plants use sunlight to make food through photosynthesis. As the fall weather arrives, trees begin to reduce their production of chlorophyll, which is influenced by cooler nighttime temperatures and shorter days.
With less chlorophyll in the mix, other pigments come to life, leading to the vibrant colors we associate with autumn. The most vibrant hues emerge when conditions are just right—not too dry and with sunny days followed by cool nights.
In South Texas, these ideal conditions often arrive later in the season, pushing peak foliage around San Antonio into mid-to-late November.
Enjoying Fall Colors Close to Home
Texas Arbor Day is on November 1st, and it’s a great time to think about planting trees! According to Texas A&M AgriLife Research, mid-October through the end of November is an excellent window for planting trees, allowing them to establish their roots before the summer heat returns.
Donald Gerber, owner of Pollinatives, notes that fall planting helps trees become established during the cooler months. For those looking to add some fall color to their yards, he suggests several native Texas trees that change colors beautifully.
One recommendation is the prairie flameleaf sumac, known for its striking red leaves, and the cedar elm, which turns a lovely yellow. Interestingly, despite its name, cedar elm is not responsible for the intense allergies often associated with ‘cedar fever’ and can provide quick shade as it grows.
Other great options for Texas yards include the Bur Oak, the Texas or Mexican redbud, and the Western Soapberry.
If you’re up for a little adventure and want to see some deep red fall colors, consider visiting Lost Maples State Natural Area in Vanderpool, which provides weekly updates on the local maple trees’ transformation throughout November.
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