Anolis carolinensis (Sauria: Polychrotidae) does not hibernate, and in an East Tennessee population near the northern limit of its geographic range, individuals aggregate on a south-facing rock bluff and are active throughout the winter. During the winters of 1998–1999 and 1999–2000, we obtained data on body size (snout–vent length and mass) of aggregated lizards early in the season and again in March. There was significant growth in SVL in both field seasons but in mass only in 1999–2000. Growth rate was greater in 1999–2000 than in 1998–1999, possibly attributable to the earlier onset of warmer temperatures in 1999–2000. Males grew at a greater rate than females. Our data also indicate that the winter sex ratio of aggregated individuals is male-biased.