No evidence for the territorial defense resources has been reported. Communal hibernation and egg-laying are well documented. Three to 13 eggs are laid by the California subspecies in July and August. These aggressive and active diurnal snakes are taken as food by a variety of mammals, diurnal birds, especially hawks, and snakes such as kingsnakes and striped racers. The social nature of this snake is demonstrated by its tendency towards communal hibernation and egg-laying.
Blue racers prey on field sparrow nests.
Brodie, E. D., Jr., R. A. Nussbaum, and R. M. Storm. An egg-laying aggregation of five species of Oregon reptiles. Brown, W. S. 1973. University of Utah. Brown, W. S., and W. S. Parker.