It is illegal to throw rocks in Utah.
Throwing rocks in Utah is illegal, especially if you throw rocks at property, people or in any manner which can cause harm or damage.
Utah Administrative Code specifically prohibits throwing, tossing or rolling rocks in state parks and other designated areas.
Throwing rocks at people, cars, homes, buildings etc could also get you arrested and charged with criminal damage, or even assault or manslaughter if you happen to kill someone with throwing the rocks.
In Utah the tossing of or throwing or rolling of any rocks or other materials into canyons, downhills, mountains or into valleys is also prohibited.
Utah State parks have regulations which prohibit throwing rocks in canyons, valleys or down hills within the state parks boundaries.
And many towns and cities in Utah like Logan Utah also have their own local ordinances against throwing of rocks which can annoy or harm pedestrians or other people.
Throwing of rocks in Utah can be charged as a misdemeanor or even a felony in some cases depending on if it results in injury or significant property damage.
Rock throwing can cause damage and harm to people and buildings, homes etc and should never be done even if you think it's a fun thing to do or a prank.
Rock throwers can face felony charges in some cases which can include charges of second degree murder, aggravated assault, throwing a missel into an occupied vehicle, criminal possession of a weapon, reckless endangerment of life and aggravated assault with a lethal weapon.