Pronounced seasonal movement or migration has not been reported. Habitat requirements, such as sites for courtship and display, egg-laying, and hibernation are apparently found within the normal area of activity. Little is known about home range. In Arizona, some individuals of a related horned lizard species, P. solare, established well-defined home ranges, while some wandered without establishing one. The reproductive season for the coast horned lizard varies from year to year and geographically depending on local conditions.
Hatching probably occurs after two months.
The spiny armour and aggressive behavior towards potential predators exhibited by horned lizards confer only partial immunity from predators. Leopard lizards, sidewinders, striped whipsnakes and other snakes, loggerhead shrikes, and hawks have all been reported as predators of horned lizards. Movement of the horned lizard Phrynosoma solare. Lynn, R. T. 1965. Nussbaum, R. A., E. D. Brodie, Jr., and R. M. Storm. 1983.