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San Antonio · TX
When does flea season start in San Antonio?
San Antonio doesn't get a real flea off-season — every month stays warm enough for fleas to keep breeding, heaviest Mar–Nov.
Ticks in San Antonio
Local tick activity typically runs year-round, heaviest all year. The species to know in Texas: lone star tick, Gulf Coast tick, brown dog tick, American dog tick.
More on species and timing: Texas tick season.
Numbers come from NOAA U.S. Climate Normals (1991–2020) recorded at SAN ANTONIO INTL AP — a climate-based estimate; real years wobble.
Frequently asked questions
When does flea season start in San Antonio?
It never fully stops — San Antonio's monthly averages support flea activity essentially all year, with the heaviest stretch Mar–Nov.
Is flea season in San Antonio different from the rest of Texas?
Not meaningfully — San Antonio tracks the Texas statewide estimate closely. Both are climate-based estimates, so treat the edges as fuzzy, not exact.
Do dogs in San Antonio need prevention outside flea season?
Yes — vets recommend year-round parasite prevention regardless of the local calendar. Indoor fleas ignore the weather entirely, and ticks in Texas are typically active year-round, a longer window than fleas get.