Technical Abstract: The root weevil Diaprepes abbreviatus was introduced into Florida in 1964. Since then, it has colonized Florida to the south but has not expanded its range to the north. We determined the effect of cold on eggs, larvae, pupae, and adults and oviposition behavior. A lower threshold for oviposition was estimated at 14.9°C. Eggs were highly susceptible to cold with 95% mortality (LTime95) occurring in 4.2 d at 12°C. Relative susceptibility of life stages to cold was eggs>pupae>larvae>adults. More than 50% of adults survived >30 d at 6°C and LTime95 for adults at 3°C was 26.5 d. Weather data was examined to guide mapping using lower larval developmental threshold (12°C) and lower oviposition threshold (15°C) as critical temperatures for distribution of D. abbreviatus and establishment of egg parasitoids, respectively. Probability maps were generated using North Carolina State University-Animal Plant Health Inspection Service-Plant Pest Forecasting System (NAPPFAST) that examined the frequency of >10, 15, 20, 25, or 30 days per winter when soil temperature was <12°C. The area that experienced 15 to 20 days per winter of mean daily soil temperature <12°C corresponded to the northern limit of D. abbreviatus in Florida. The homologous map of Arizona, California, and Texas predicted areas in the southern portions of those states where soil temperatures are favorable for D. abbreviatus. Air temperature maps suggested that establishment of egg parasitoids will be limited to southern Florida where mean daily air temperatures <15°C occur <25 days per year. The model predicted that egg parasitoids will not establish in Arizona, California or Texas.