Lawn Care Guide for Bexar County
Bexar County, Texas
Data Story
About Lawn Care in Bexar County, Texas
The San Antonio Struggle
Bexar County is one of the toughest places for a lawn, with a difficulty score of 24.9. This is significantly lower than the Texas average of 31.7 and less than half the national median of 50.0. Residents in Zone 9a must be experts in heat management to keep a lawn green.
High Demand in a Hot Climate
Bexar County endures 123 extreme heat days and 7,577 growing degree days, creating massive water demand. While 31.9 inches of annual rain is technically enough, it rarely keeps up with the evaporation caused by San Antonio's heat. Mowing at the highest possible setting is vital to protecting the grass crowns.
Well-Drained Loamy Soil
The soil is a loam consisting of 30.0% clay and 37.3% sand, providing a balanced, well-drained medium for growth. The pH of 7.32 is slightly alkaline, meaning regular fertilization with acidifying agents may be necessary. This soil structure is generally good, but it requires consistent moisture to remain productive.
Year-Long Severe Drought
With 53 weeks in drought and 100% of the county in severe drought, water restrictions are a way of life here. Lawns must be trained for drought by watering deeply and as infrequently as local laws allow. Transitioning to native, drought-resistant varieties is a smart long-term strategy for this region.
Early Start for Zone 9a
St. Augustine is a popular choice for its shade tolerance, but Bermudagrass offers better drought recovery. Because the last frost is usually around February 25, you have a very early window to begin spring maintenance. Starting early helps the grass establish before the 123-day heat window begins in earnest.
Lawn Difficulty Score
Recommended Grasses
Bermudagrass
Cynodon dactylon
Climate Snapshot
Annual Precip
31.9"
Growing Degree Days
7,576.6
Base 50F
Last Spring Frost
02/25
First Fall Frost
12/03
Days Above 95F
123
Hardiness Zone
9a
Seeding Calendar — Zone 9A
Seasonal Lawn Care Checklist
Spring
- Apply pre-emergent herbicide when soil reaches 55F
- Begin mowing when grass reaches 3 inches
- Start irrigation if rainfall is below 1 inch/week
- Soil test every 2-3 years — adjust lime or sulfur as needed
Summer
- Raise mowing height to reduce heat stress
- Water deeply 1-2 times per week (1 inch total)
- Avoid fertilizing cool-season grasses in peak heat
- Scout for grubs and treat if >10 per sq ft
Fall
- Overseed warm-season lawns if thinning
- Apply fall fertilizer (highest N application for cool-season)
- Continue mowing until growth stops
- Rake or mulch leaves to prevent smothering
Winter
- Apply pre-emergent for winter weeds
- Service mower and sharpen blades
- Plan spring soil amendments based on fall test
- Overseed with ryegrass for winter color
Watering Deficit Calculator
Monthly Deficit
1.5"
inches of water
Monthly Water
4,639
gallons
Estimated Monthly Cost
$37.11
at $0.008/gallon average
Estimates based on 32" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Bexar County
Persistent Drought Conditions
Bexar County experienced drought conditions for 53 of the past 52 weeks. Prioritize water-efficient grasses and consider reducing lawn area.
Learn more about regional lawn challenges at The Lawn Report.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
Data sourced from USDA SSURGO, NOAA Climate Normals (1991-2020), USDA Plant Hardiness Zone Map, and US Drought Monitor. Lawn difficulty scores and grass recommendations are estimates for informational purposes only.
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