Cluster E — Prevention · 6 min read
San Antonio Tree Care Calendar: Month-by-Month for Homeowners
By San Antonio Tree Care Team•Published: 2026-03-20•Updated: 2026-10-09
The South Texas Tree Care Rhythm: Seasonal Precision Across Bexar County
Caring for mature shade trees in San Antonio requires working in harmony with our distinctive South Texas sub-tropical climate. Unlike northern regions where trees experience long, frozen winters and mild summers, San Antonio trees face mild, erratic winters, intense spring growth flushes, scorching four-month summer droughts, and acute seasonal biosecurity rules.
Managing your trees on a structured, month-by-month arboricultural calendar ensures optimal vigor, prevents catastrophic storm failures, and guarantees strict compliance with regional oak wilt prevention ordinances.
Winter (December – February): Peak Pruning Window, Root Flare Care & Dormancy
Winter is the premier working season for South Texas arborists. As deciduous trees (cedar elms, pecans, bur oaks) shed their foliage, their internal branching architecture and structural defects become completely visible. Live oaks enter deep metabolic dormancy, making winter the safest time for major structural pruning.
• December: Schedule comprehensive structural crown thinning, deadwood cleaning, and canopy raising across all species. Ensure all oak pruning wounds are painted immediately with wound sealant.
• January: Optimal month for planting containerized and ball-and-burlap native Texas shade trees (Live Oak, Bur Oak, Chinquapin Oak, Cedar Elm). Winter planting allows root systems to establish before summer heat.
• February: Begin preparing for the oak wilt pruning moratorium that takes effect February 1. Complete all elective live oak and red oak pruning prior to February 1. Inspect palm trees following arctic freezes, leaving brown fronds intact for thermal protection.
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Spring (March – May): Oak Wilt Moratorium, Growth Flushes & Soil Management
Spring brings rapid leaf emergence, vibrant flowering, and severe supercell thunderstorms across South Texas. Spring is also the high-risk transmission window for oak wilt:
• March: The oak pruning moratorium is in full effect across Bexar County. Strictly avoid non-emergency trimming of all oak species through June 30. Inspect canopies for hanging storm widowmakers and clear roof gutter debris.
• April: Apply a 3-to-4-inch layer of organic coarse hardwood mulch across tree root zones, maintaining a clear 4-inch buffer around trunk bark. Inspect tender young oak foliage for early signs of veinal necrosis.
• May: Begin monitoring soil moisture as daytime temperatures climb into the 90s. Perform pre-storm canopy evaluations before severe thunderstorm winds and spring hail events strike.
Summer (June – August): Drought Defense, Deep Soaking & Heat Mitigation
Summer in San Antonio is defined by triple-digit heat and municipal watering restrictions. The primary objective is preventing acute vascular drought stress and root desiccation:
• June: Conclude the spring oak pruning moratorium on June 30. Begin deep root soaking on specimen shade trees once every 10 to 14 days using soaker hoses under the drip line.
• July: Summer pruning window opens; selective deadwood removal and hazard pruning can resume on oaks, with mandatory wound painting enforced within seconds. Strictly avoid high-nitrogen fertilizers that stimulate water-hungry vegetative growth.
• August: Peak drought monitoring. Inspect mature hardwoods for signs of hypoxylon canker (sloughing bark) and premature foliar scorching. Deep-soak high-value specimen trees during Stage 2 and Stage 3 watering restrictions.
Autumn (September – November): Secondary Growth Flush, Structural Prep & Planting
As scorching summer heat subsides, South Texas trees experience a secondary autumn root growth flush. Autumn is the time to prepare trees for winter storms and plant new shade trees:
• September: Inspect canopies following late-summer tropical weather systems. Prune broken, splintered limbs and address summer drought dieback.
• October: Prime month for selecting and planting native shade trees. Warm autumn soils and cool air temperatures encourage rapid root establishment.
• November: Winter oak pruning season begins. Schedule comprehensive 3-to-5-year maintenance pruning, crown thinning, and ball moss extraction across all residential and commercial properties.
Common Questions Related to This Guide
February 1 through June 30 is the most dangerous window to prune live oaks and red oaks due to peak nitidulid beetle activity and oak wilt spore mat production. Pruning during this period dramatically increases the risk of catastrophic vascular infection.
Related Services & Local Coverage
Explore professional services and local neighborhoods mentioned in this guide:
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