Gila monsters are one of two types of venomous lizards in the world. if you wanted to avoid coming across the gila monster when hiking in arizona you would want to avoid and because gila monsters are crepuscular.

The answer is dusk and dawn.

Crepuscular animals are active during twilight (latin crepusculum). Twilight is a period after dawn and before dusk, so crepuscular animals want to avoid dusk and dawn. Animals' activity in different periods during the day depends on temperature or other biotic factors. It also depends on predators' activities or local competition.