Throwing a rock in Colorado can be anything from a $100 civil infraction to a life sentence, and the difference comes down to what the rock hits and how badly someone gets hurt. Colorado rock throwing charges usually start with the state’s missile statute, but prosecutors stack additional counts for assault, criminal mischief, reckless endangerment, or homicide as soon as the facts support them. An impulsive toss from an overpass can end in decades of prison time.
Throwing Missiles at Vehicles and Bicyclists
Colorado’s dedicated rock-throwing law is C.R.S. 18-9-116, which makes it illegal to knowingly throw any object at a vehicle or transportation equipment. The statute defines “missile” broadly as “any object or substance,” so gravel, a bottle, or a snowball packed with ice all qualify.
Throwing an object at a car or truck is a civil infraction with a maximum penalty of a $100 fine. Throwing the same object at a bicyclist is a class 2 misdemeanor, punishable by up to 120 days in jail and a $750 fine.1Justia. Colorado Code 18-9-116 – Throwing Missiles at Vehicles – Harassment of Bicyclists In practice, the civil infraction for hitting a car is almost never the only charge filed. Damage brings criminal mischief. Injury brings assault. The missile statute is usually just the starting point.
The mental state requirement is “knowingly.” Prosecutors have to show you deliberately threw the object at the vehicle or bicyclist. An accidental toss that happens to strike a passing car is different from standing on an overpass aiming at windshields.1Justia. Colorado Code 18-9-116 – Throwing Missiles at Vehicles – Harassment of Bicyclists
Reckless Endangerment When Nothing Is Hit
Even when the rock misses everyone, you can be charged with reckless endangerment under C.R.S. 18-3-208. The statute applies when someone recklessly creates a substantial risk of serious bodily injury to another person. Lobbing rocks from an overpass onto a busy highway fits that description whether or not the rocks connect. Reckless endangerment is a class 2 misdemeanor with up to 120 days in jail and a $750 fine.2Justia. Colorado Code 18-1.3-501 – Misdemeanors Classified – Penalties Prosecutors often use it as a bridge between the missile statute and full assault charges when the conduct was clearly dangerous but didn’t result in contact.
Assault Charges When a Rock Hits a Person
The legal picture shifts once a thrown rock actually strikes someone. Colorado recognizes three degrees of assault, and the applicable degree depends on the severity of the injury and the thrower’s state of mind.
Third-Degree Assault
C.R.S. 18-3-204 covers knowingly or recklessly causing bodily injury to another person. A rock that produces a cut, bruise, or minor concussion can support this charge, which is the most common assault count in rock-throwing cases. It is a class 1 misdemeanor carrying up to 364 days in jail and a $1,000 fine.3Justia. Colorado Code 18-3-204 – Assault in the Third Degree
Second-Degree Assault
C.R.S. 18-3-203 applies when someone intentionally causes bodily injury using a deadly weapon. Colorado courts regularly treat rocks as deadly weapons when the circumstances make them dangerous, such as a large stone thrown from a highway overpass at a moving car. Second-degree assault is a class 4 felony with a presumptive sentence of 2 to 6 years in prison. Because it is designated an extraordinary risk crime, the maximum can rise to 8 years.4Justia. Colorado Code 18-3-203 – Assault in the Second Degree
First-Degree Assault
C.R.S. 18-3-202 is reserved for cases where the thrower intended to cause serious bodily injury and did so with a deadly weapon. A heavy rock thrown at close range at someone’s head, producing a skull fracture or permanent disfigurement, is the paradigm case. First-degree assault is a class 3 felony, punishable by 4 to 12 years in prison.5Justia. Colorado Code 18-3-202 – Assault in the First Degree
Whether a rock qualifies as a deadly weapon is a question for the court. Judges look at the object’s size, the force behind it, the distance, and the vulnerability of the target. A pebble flicked in a parking lot likely doesn’t clear the bar. A fist-sized chunk of concrete thrown from an overpass at 65-mph traffic almost certainly does.
Murder and Attempted Murder
When a thrown rock kills someone, prosecutors can pursue first-degree murder under C.R.S. 18-3-102. The most relevant theory in these cases is extreme indifference to human life: knowingly engaging in conduct that creates a grave risk of death and actually causing a death. Hurling large rocks or heavy objects into high-speed freeway traffic is exactly the conduct this provision targets. The state doesn’t need to prove the thrower specifically wanted to kill anyone, only that the behavior showed complete disregard for human life.6Justia. Colorado Code 18-3-102 – Murder in the First Degree
First-degree murder is a class 1 felony. Colorado abolished the death penalty in 2020, so the sentence is life in prison without the possibility of parole.7Justia. Colorado Code 18-1.3-401 – Felonies Classified – Presumptive Penalties
If the victim survives but the conduct could have been fatal, attempted first-degree murder may be charged. Under Colorado’s criminal attempt statute, attempting a class 1 felony is treated as a class 2 felony, with a presumptive sentence of 8 to 24 years in prison.
Criminal Mischief for Property Damage
Damage to a vehicle or other property is charged as criminal mischief under C.R.S. 18-4-501. The offense class depends entirely on the total dollar value of damage from a single incident:
- Less than $300: petty offense
- $300 to $999: class 2 misdemeanor (up to 120 days in jail, $750 fine)
- $1,000 to $1,999: class 1 misdemeanor (up to 364 days in jail, $1,000 fine)
- $2,000 to $4,999: class 6 felony (1 to 1.5 years in prison)
- $5,000 to $19,999: class 5 felony (1 to 3 years in prison)
- $20,000 to $99,999: class 4 felony (2 to 6 years in prison)
- $100,000 to $999,999: class 3 felony (4 to 12 years in prison)
- $1 million or more: class 2 felony (8 to 24 years in prison)
A single shattered windshield usually costs $300 to $1,000 to replace, putting most isolated incidents in misdemeanor territory. A spree targeting multiple vehicles can push the aggregate damage into felony range quickly. Repair estimates and insurance adjuster reports become key evidence.
Restitution on Top of Any Sentence
Every criminal conviction in Colorado, from petty offenses through felonies, must address restitution. The court enters one of four things: a specific dollar amount, an order establishing the obligation with the amount to be set within 91 days, an order for future treatment costs, or a finding that no victim suffered financial loss.9Justia. Colorado Code 18-1.3-603 – Assessment of Restitution – Corrective Orders
In rock-throwing cases, restitution can cover repair or replacement of damaged property, insurance deductibles, medical bills, lost wages for court appearances, and travel costs for hearings. This runs on top of criminal fines. Even a misdemeanor conviction can leave someone owing victims thousands of dollars.9Justia. Colorado Code 18-1.3-603 – Assessment of Restitution – Corrective Orders
Criminal exposure isn’t the end of it. A victim can also sue in civil court for medical bills, lost income, and pain and suffering, with a two-year statute of limitations from the date of injury.10Justia. Colorado Code 13-80-102 – General Limitation of Actions Civil judgments aren’t capped like criminal fines, and the lower burden of proof means a civil suit can succeed even after a criminal acquittal. Standard homeowner’s and renter’s liability policies exclude intentional acts, so throwers typically pay these judgments personally.
Juvenile Offenders and Parental Liability
Rock throwing is often committed by minors, and Colorado holds parents financially responsible in a limited way. Under C.R.S. 13-21-107, parents can be held civilly liable for property damage or bodily injury caused by their minor child, with liability capped at $3,500. The cap applies only on the civil side. If the juvenile is adjudicated delinquent, the court can also order restitution, and parents usually end up paying because minors rarely have assets or income.
A juvenile adjudicated for a serious offense such as second-degree assault may also face detention. A delinquency adjudication creates a record that can affect educational and employment opportunities even after the juvenile turns 18.
When Federal Charges Are Possible
Most rock-throwing cases stay in Colorado state court, but federal charges can apply when the target involves interstate commerce. Under 18 U.S.C. § 33, willfully damaging or disabling a motor vehicle used in interstate or foreign commerce, with intent to endanger passenger safety or reckless disregard for human life, carries up to 20 years in federal prison. If someone dies, the sentence can extend to life.11Office of the Law Revision Counsel. 18 USC 33 – Destruction of Motor Vehicles or Motor Vehicle Facilities
A separate statute, 18 U.S.C. § 1992, covers attacks on railroad carriers and mass transit systems, with penalties up to 20 years, or life if someone is killed.12Office of the Law Revision Counsel. 18 USC 1992 – Terrorist Attacks and Other Violence Against Railroad Carriers and Against Mass Transportation Systems Federal prosecution is uncommon in typical rock-throwing incidents, but it becomes a live possibility when the facts involve interstate highways or rail infrastructure and someone is badly hurt or killed.