Egg rafts deposited by Culex quinquefasciatus were counted daily in 2 oviposition traps in southeastern San Antonio, Texas. Fourteen months of continuous data (1981-82) indicated that the period of greatest oviposition was from May through September. The most favorable ambient temperatures for oviposition were a maximum over 27oC (80oF) or a minimum between 18oC (65oF). Oviposition continued sporadically in January and February, the coldest months of the winter. Egg rafts were found in the traps in winter following temporary periods of warm weather.