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Tbe reproductive and developmental biology, including life tables, for Homalodisca vitripennis (Cermar) (Hemiptera: Cicadellidae), the glassy-winged sharpshooter, were quantified at four constant temperatures in the laboratory: 20, 25, 30, and 33°C. Mean time from egg oviposition to adult death and mean female adult longevity was greatest at 25°C. Mean total progeny production was greatest at 25°C at 214 eggs per individual. Tbe percentage of females ovipositing at each experimental temperature was relatively low at 22, 46, and 56% at 20, 25, and 30°C, respectively. No oviposition occurred at 33°C. Upper, lower, and optimal developmental thresholds were calculated for all fife stages, and for egg to adult emergence these were 35.95, 13.99, and 29.45°C, respectively. Key demographic parameters were calculated and intrinsic rate of increase and net reproductive rate were highest at 30 and 25°C at 0.04 and 40.21 d, respectively. Mean generation times and population doubling times were lowest at 25 (97.66 d) and 30°C (15.51 d). Modefing of demographic parameters indicated that approximately three generations of H. vitripennis per year are needed for the existence of permanent populations. Historical weather data were used to map the number of generations and estimate net reproductive rates for H. vitripennis throughout California. Data presented here will be useful for modehng and estimating the possible invasion success of H. vitripennis in areas other than California.