ORS 163.160: Oregon Fourth-Degree Assault Penalties and Defenses

Assault in the fourth degree in Oregon, codified at ORS 163.160, is the state’s lowest-level criminal assault charge. It is usually a Class A misdemeanor carrying up to 364 days in jail and a fine of up to $6,250, but five specific circumstances raise it to a Class C felony punishable by up to five years in prison and a fine of up to $125,000.¹ The statute reaches further than a typical fistfight, covering injuries caused with deadly weapons and serious injuries drivers inflict on pedestrians and cyclists.

What Conduct the Statute Covers

ORS 163.160 defines three separate ways to commit the offense, each with its own mental state.

The first and most common version applies when a person intentionally, knowingly, or recklessly causes physical injury to another. This is the ordinary scenario: a punch during an argument, a shove that leaves bruising, an object thrown at someone’s head.¹

The second version applies when someone uses a deadly weapon with criminal negligence and causes physical injury. A deadly weapon under Oregon law is any instrument specifically designed for and presently capable of causing death or serious physical injury.² The prosecution does not have to prove intent to hurt anyone, only that the person failed to recognize a substantial risk a reasonable person would have noticed.

The third version targets drivers. A motor vehicle operator commits fourth-degree assault when criminal negligence behind the wheel causes serious physical injury to a “vulnerable user of a public way.” Oregon defines that category broadly to include pedestrians, highway workers, people riding animals, and anyone on a bicycle, skateboard, scooter, motorcycle, moped, or roller skates on a public road or crosswalk.³ This version requires serious physical injury, not just physical injury, and the felony enhancements below do not apply to it.¹

What Counts as Physical Injury

Physical injury in Oregon means impairment of a physical condition or substantial pain.² A shove that produces only momentary discomfort may not meet this threshold. Bruising, swelling, cuts, or lasting soreness usually do.

The mental state matters as much as the injury. For the basic version, prosecutors must prove one of three: acting intentionally (with the conscious goal of causing harm), acting knowingly (aware the conduct was practically certain to cause harm), or acting recklessly (aware of a substantial risk and consciously disregarding it, in a way that grossly departs from reasonable behavior).⁴ Criminal negligence, which applies to the deadly-weapon and vulnerable-user versions, sits one step lower. A reckless person sees the risk and ignores it; a criminally negligent person fails to see it at all, and that failure must still be a gross deviation from reasonable care.

Misdemeanor Penalties

Without any aggravating factor, fourth-degree assault is a Class A misdemeanor, the most serious misdemeanor level in Oregon. The maximums are 364 days in jail⁵ and a $6,250 fine.⁶

The 364-day cap is deliberate. A jail sentence of 365 days or more can trigger automatic deportation for noncitizens under federal immigration law, so Oregon set the ceiling one day short of a year. That single day carries outsized weight for anyone who is not a U.S. citizen.

Prosecutors have two years from the date of the offense to file misdemeanor charges.⁷

When the Charge Becomes a Felony

Five circumstances elevate fourth-degree assault to a Class C felony. These enhancements apply to the intentional/knowing/reckless version and to the deadly-weapon version, but not to the vulnerable-user motor vehicle version.¹

A minor child witnesses the assault. The child can be the defendant’s or the victim’s child or stepchild, or any minor living in either household. Witnessing includes seeing the assault or directly perceiving it in another way, such as hearing it from another room.
The defendant has a prior conviction against the same victim for fourth-, third-, second-, or first-degree assault, strangulation, or menacing. Equivalent out-of-state convictions count.
The defendant has three or more prior convictions for that same list of offenses, against any victim. Out-of-state convictions count here too.
The defendant knows the victim is pregnant.
The victim was performing official employment duties at the time of the assault, and the defendant has at least two prior assault convictions in which at least two of the earlier victims were also performing job duties.

A Class C felony conviction carries up to five years in state prison⁸ and a fine of up to $125,000.⁹ Actual sentences are set by reference to Oregon’s Sentencing Guidelines Grid, which combines the crime’s seriousness ranking with the defendant’s criminal history score. First-time offenders convicted of a low-seriousness felony often receive presumptive probation rather than prison.¹⁰

The Domestic Violence Designation and Firearm Ban

If the assault qualifies as domestic violence, the court must note that fact on the judgment.¹ That notation carries a federal consequence many defendants do not anticipate.

Under 18 U.S.C. § 922(g)(9), anyone convicted of a misdemeanor crime of domestic violence is permanently barred from possessing, transporting, or receiving any firearm or ammunition.¹¹ The ban has no expiration date. It applies to hunting rifles and antique firearms. It applies to law enforcement officers and military personnel on and off duty. Violating it is a separate federal felony.

The domestic violence label can attach to any fourth-degree assault between people in qualifying relationships, including current or former spouses, cohabitants, and parents of a shared child. A single shove during a household argument, charged as a misdemeanor and resolved with a modest sentence, can permanently strip gun rights when the relationship fits the federal definition.

Self-Defense

Self-defense is the most common justification raised against fourth-degree assault charges. Under ORS 161.209, a person is justified in using physical force to defend themselves or a third person when they reasonably believe someone is about to use unlawful physical force against them. The force used must be what the person reasonably believes is necessary to stop the threat.¹²

“Reasonably believes” does the heavy lifting. Oregon does not ask whether you were actually in danger, but whether a reasonable person in your position would have believed force was necessary. A punch thrown because someone reaches into their jacket and you genuinely think a weapon is coming out can still be justified if the person was reaching for a phone. A punch thrown because someone insulted you cannot.

Force must also be proportional to the perceived threat. Deadly force has its own separate rules. And a person who started the fight cannot claim self-defense unless they clearly withdrew from it before responding with force. These limits often decide cases where both people were swinging: whoever escalated, or kept going after the threat ended, has the harder argument.

Clearing the Conviction Later

Oregon allows people convicted under ORS 163.160 to petition the court to set aside the conviction, the state’s version of expungement. The waiting period depends on the level of conviction.¹³

For a Class A misdemeanor: three years from the date of conviction or release from incarceration, whichever is later.
For a Class C felony: five years from the date of conviction or release from incarceration, whichever is later.

You must have fully completed your sentence, including probation. If probation was revoked, the wait is at least three years from the revocation date or the standard waiting period, whichever is later. You also cannot have picked up any other criminal convictions (traffic violations aside) during the applicable waiting period.

One caution worth flagging: even after an Oregon court sets aside a domestic violence conviction, the federal firearm ban may still apply. Federal law has its own rules about when an expunged conviction still counts, and anyone in that situation should confirm federal firearm eligibility separately before purchasing or possessing a gun.

1
Oregon State Legislature. Oregon Revised Statutes 163.160 – Assault in the Fourth Degree
2
Oregon State Legislature. Oregon Revised Statutes 161.015 – General Definitions
3
Oregon Public Law. Oregon Revised Statutes 801.608 – Vulnerable User of a Public Way
4
Oregon Public Law. Oregon Revised Statutes 161.085 – Definitions With Respect to Culpability
5
Oregon Public Law. Oregon Revised Statutes 161.615 – Maximum Terms of Imprisonment for Misdemeanors
6
Oregon Public Law. Oregon Revised Statutes 161.635 – Fines for Misdemeanors
7
Oregon Public Law. Oregon Revised Statutes 131.125 – Time Limitations
8
Oregon Public Law. Oregon Revised Statutes 161.605 – Maximum Terms of Imprisonment for Felonies
9
Oregon Public Law. Oregon Revised Statutes 161.625 – Fines for Felonies
10
Oregon Criminal Justice Commission. Oregon Sentencing Guidelines Grid
11
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
12
Oregon State Legislature. Oregon Revised Statutes 161.209 – Use of Physical Force in Defense of a Person
13
Oregon Public Law. Oregon Revised Statutes 137.225 – Order Setting Aside Conviction or Record of Criminal Disposition