California Self-Defense and Use of Force

Duty to Retreat, Aggressor Rules, and Governing Legal Framework

Executive Summary

California does not have a stand-your-ground statute, but California appellate courts have held since 1923 that there is no duty to retreat before using force in self-defense when a person is not at fault. The rule is applied through jury instruction CALCRIM No. 3470 (non-homicide) and CALCRIM No. 505 (homicide), and is grounded in Penal Code §§ 197–199 and 692–694.

The general rule has three non-negotiable elements: reasonable belief of imminent danger, reasonable belief that force is necessary, and use of no more force than reasonably necessary. A defendant who is the initial aggressor loses the right of self-defense unless (a) a good-faith withdrawal has been communicated, or (b) the other party suddenly escalates to deadly force in response to non-deadly aggression. The Castle Doctrine (Penal Code § 198.5) creates a rebuttable presumption of reasonable fear when an unlawful and forcible intruder enters the residence.

I. The General Rules of Self-Defense

A. Statutory Framework

California’s self-defense framework is scattered across several Penal Code sections:

• Penal Code § 197 — Enumerates when a homicide is justifiable (resisting murder/felony/great bodily injury, defense of habitation or person, lawful defense of self or family, and in apprehending a felon or keeping the peace).
• Penal Code § 198 — Requires that the person acting under §§ 197(2) and 197(3) must have acted under the influence of reasonable fears alone, not revenge or passion.
• Penal Code § 198.5 — Codifies the Castle Doctrine’s rebuttable presumption of reasonable fear within a residence.
• Penal Code §§ 692–694 — Codify lawful resistance: § 692 identifies who may resist, § 693 sets the circumstances under which resistance is justified, and § 694 governs the use of force by other persons to prevent a public offense.

B. The Three Elements (CALCRIM No. 3470)

For a non-homicide use of force, Judicial Council of California Criminal Jury Instruction No. 3470 controls. To establish lawful self-defense or defense of another, the defendant must have acted under all three of the following conditions:

1. The defendant reasonably believed he/she (or someone else) was in imminent danger of suffering bodily injury or of being touched unlawfully;
2. The defendant reasonably believed that the immediate use of force was necessary to defend against that danger; AND
3. The defendant used no more force than was reasonably necessary to defend against that danger.

The same basic structure is used in CALCRIM No. 505 for justifiable homicide, except that (a) the fear must be of death, great bodily injury, or of the commission of a forcible and atrocious crime, and (b) the force used must have been deadly only because a reasonable person would have believed deadly force was necessary.

C. “Imminent” Means Immediate

The danger must be present and existing at the moment force is used. CALCRIM 3470 expressly states that belief in future harm is insufficient, no matter how great or how likely that future harm is believed to be. This threshold was articulated in People v. Aris (1989) 215 Cal.App.3d 1178 (overruled on other grounds by People v. Humphrey (1996) 13 Cal.4th 1073) and remains the governing standard.

D. The Reasonableness Standard

California uses an objective-plus-subjective test: the defendant must actually hold the belief (subjective) and that belief must also be one a reasonable person in the same circumstances would hold (objective). Under People v. Humphrey (1996) 13 Cal.4th 1073, the reasonableness inquiry considers what a reasonable person would have believed under all the circumstances known to the defendant, which can include prior threats, prior assaults by the victim, and (where applicable) expert testimony regarding intimate partner battering. People v. Jefferson (2004) 119 Cal.App.4th 508 confirms, however, that the reasonable-person standard is not adjusted downward to account for a defendant’s mental impairment.

E. Proportionality of Force

Force must be proportional to the threat. Non-deadly force may be met with non-deadly force; deadly force is justified only when the threat is itself one of death, great bodily injury, or the commission of a forcible and atrocious felony (see People v. Ceballos (1974) 12 Cal.3d 470, 478, construing the felony clause of Penal Code § 197). A response that grossly exceeds the threat level forfeits the defense.

II. Duty to Retreat — The Core Question

A. The General Rule: No Duty to Retreat

California imposes no duty to retreat on a person who is not at fault and is in a place he or she has a right to be. The rule has been law since at least 1923. In People v. Estrada (1923) 60 Cal.App. 477, 482, the Court of Appeal stated plainly:

“Our law nowhere imposes the duty of retreat upon one who, without fault himself, is exposed to a sudden felonious attack, and … the duty of withdrawal or retreat is imposed upon him alone who is the first aggressor, or has joined in a mutual combat …”

The same rule was reaffirmed in People v. Hughes (1951) 107 Cal.App.2d 487 and People v. Hatchett (1942) 56 Cal.App.2d 20, and is reflected in the bench notes to CALCRIM 3470.

B. “Stand Your Ground” in California

California does not have a stand-your-ground statute. The right to stand one’s ground exists as a matter of common law and jury instruction. The distinction matters: in true stand-your-ground states, the rule is codified and often accompanied by civil and criminal immunity provisions. California offers no such immunity; the absence of a duty to retreat operates only as part of the jury’s evaluation of whether the defendant’s use of force was reasonable.

C. The Right to Pursue

California law recognizes not only the right to stand ground, but also — within limits — the right to pursue an attacker until the danger has passed. This rule traces to People v. Hatchett (1942) 56 Cal.App.2d 20 and is reflected in modern practice. Once the danger has ended, however, the right to use force ends with it (CALCRIM No. 3474 — “Danger No Longer Exists or Attacker Disabled”). Continued force after an attacker withdraws or is disabled converts lawful self-defense into an unlawful assault or homicide.

D. Retreat as a Factor in Reasonableness

Although there is no legal duty to retreat, the availability of retreat is not legally irrelevant. If a defendant could have safely retreated but instead used force, a jury may consider that fact in deciding whether the defendant’s belief that force was necessary, or the level of force used, was objectively reasonable. The absence of a duty to retreat is a rule of law; the reasonableness of using force (instead of retreating when doing so was plainly safe) remains a question of fact.

III. The Aggressor Rules — When the Defendant Started It

A. Statutory Basis

Penal Code § 197(3), speaking to justifiable homicide in defense of person, imposes an express limitation:

“… but such person, or the person in whose behalf the defense was made, if he or she was the assailant or engaged in mutual combat, must really and in good faith have endeavored to decline any further struggle before the homicide was committed.”

This is the statutory source of the initial-aggressor limitation on self-defense. It is expanded by CALCRIM No. 3471 (non-homicide) and applied in the homicide context through CALCRIM No. 505.

B. The Two Paths Back to Self-Defense (CALCRIM No. 3471)

An initial aggressor — or a party to mutual combat — regains the right to self-defense only in one of two ways:

Path 1: Good-Faith Withdrawal (Applies to Any Aggression)

The initial aggressor must show:

1. He or she actually and in good faith tried to stop fighting; AND
2. He or she indicated, by word or by conduct, to the opponent, in a way that a reasonable person would understand, that he or she wanted to stop fighting and had stopped fighting; AND
3. He or she gave the opponent a chance to stop fighting.

If the opponent continues to fight despite the good-faith withdrawal, the right of self-defense is restored. This rule is drawn from Penal Code § 197(3) and People v. Trevino (1988) 200 Cal.App.3d 874, 879.

Path 2: Sudden Escalation (Non-Deadly Aggressor Faces Deadly Response)

The second path, recognized in People v. Quach (2004) 116 Cal.App.4th 294, 301–302, applies when the initial aggression was non-deadly and the opponent responds with a sudden and deadly counter-attack. In that narrow situation:

• The aggressor does not need to first withdraw or communicate a desire to stop fighting; and
• The aggressor may respond in self-defense, including with deadly force, if reasonably necessary to meet the sudden deadly counter-attack.

This rule recognizes the common-law principle that a person who throws a punch has not forfeited the right to resist being shot. See also People v. Sawyer (1967) 256 Cal.App.2d 66, 75.

C. “Mutual Combat” Has a Technical Meaning

One of the most important clarifications in modern California self-defense law is People v. Ross (2007) 155 Cal.App.4th 1033, 1045. The Ross court held that “mutual combat” is a term of art, not simply any fight between two people:

“A fight is mutual combat when it began or continued by mutual consent or agreement. That agreement may be expressly stated or implied and must occur before the claim to self-defense arose.”

Under Ross, if one party is merely responding impulsively to an unexpected blow, that does not convert the encounter into “mutual combat” for purposes of triggering the aggressor limitations. This definition is now embedded in CALCRIM No. 3471.

D. Self-Defense May Not Be Contrived (CALCRIM No. 3472)

A person who deliberately creates a situation designed to provoke an attack — so that the person can then “defend” with force — has no right of self-defense. CALCRIM No. 3472 states the rule: a person does not have a right to self-defense if he or she provokes a fight or quarrel with the intent to create an excuse to use force. The classic example in the case law is walking into a bar and issuing an insult with the goal of drawing the first punch so that a planned counter-attack can be launched.

IV. The Castle Doctrine (Penal Code § 198.5)

A. The Statutory Text

Penal Code § 198.5 provides in full:

“Any person using force intended or likely to cause death or great bodily injury within his or her residence shall be presumed to have held a reasonable fear of imminent peril of death or great bodily injury to self, family, or a member of the household when that force is used against another person, not a member of the family or household, who unlawfully and forcibly enters or has unlawfully and forcibly entered the residence and the person using the force knew or had reason to believe that an unlawful and forcible entry occurred. As used in this section, great bodily injury means a significant or substantial physical injury.”

B. The Four Elements of the Presumption

The Penal Code § 198.5 presumption applies only when all four elements are met:

1. The intruder was not a member of the household or family;
2. The intruder unlawfully AND forcibly entered, or attempted to enter, the residence;
3. The resident knew, or had reason to believe, that an unlawful and forcible entry had occurred; AND
4. The resident used force intended or likely to cause death or great bodily injury against the intruder inside the residence.

CALCRIM No. 3477 implements the § 198.5 presumption and makes clear that if the four elements are met, the jury must presume the resident reasonably feared imminent death or great bodily injury unless the prosecution proves otherwise beyond a reasonable doubt.

C. Scope Limitations

• “Residence” only — not business, vehicle, or yard. The presumption applies strictly inside the dwelling. An unenclosed front porch does not qualify (see People v. Brown (1992) 6 Cal.App.4th 1489). Outside the residence, the ordinary self-defense analysis under CALCRIM 3470/505 applies.
• Forcible entry required. Mere trespass is not enough; the entry must be both unlawful and forcible.
• Not applicable to household members. The presumption cannot be invoked against a family member or co-resident.
• Rebuttable, not absolute. Under Evidence Code §§ 601 and 604–606, the § 198.5 presumption is a rebuttable presumption affecting the burden of proof. The prosecution may still secure a conviction by disproving reasonable fear beyond a reasonable doubt.

V. Defense of Others and Defense of Property

A. Defense of Others (CALCRIM No. 3470)

The same three elements that govern self-defense govern defense of another. The defender must reasonably believe the third party was in imminent danger, reasonably believe that force was necessary, and use no more force than reasonably necessary. Under People v. Randle (2005) 35 Cal.4th 987, the defender’s belief is judged from the defender’s perspective — not the third party’s — and imperfect defense of others (honest but unreasonable belief) can reduce murder to voluntary manslaughter.

B. Defense of Habitation (Penal Code § 197(2))

Separate from § 198.5, Penal Code § 197(2) authorizes justifiable homicide in defense of habitation when committed against one who manifestly intends or endeavors, by violence or surprise, to commit a felony, or to enter the habitation in a violent, riotous, or tumultuous manner with the purpose of offering violence to someone inside. Unlike § 198.5, this provision requires manifest violent or felonious intent and does not carry the automatic presumption of reasonable fear.

C. Defense of Property (CALCRIM No. 3476)

A person may use reasonable force to protect real or personal property from imminent harm. The force used must be reasonable and proportional, and deadly force is NEVER justified to defend property alone — there must also be a reasonable fear of imminent death or great bodily injury to a person. People v. Ceballos (1974) 12 Cal.3d 470 is the controlling authority and is the reason that spring guns and similar traps are unlawful in California even when deployed in defense of a home.

D. Ejecting a Trespasser (CALCRIM No. 3475)

An owner or lawful occupant may request that a trespasser leave and, if the trespasser fails to do so within a reasonable time and it would appear to a reasonable person that the trespasser poses a threat to the property or persons on it, may use reasonable force to eject the trespasser. Deadly force remains unavailable absent a separate reasonable fear of death or great bodily injury.

VI. Additional Limits and Exceptions

A. Imperfect Self-Defense

Where a defendant actually but unreasonably believes in the need for deadly force, the resulting homicide is not justifiable, but it is also not murder — it is voluntary manslaughter. This “imperfect self-defense” doctrine is rooted in People v. Flannel (1979) 25 Cal.3d 668, codified in the voluntary manslaughter definition at Penal Code § 192(a), and implemented through CALCRIM No. 571.

B. Resisting Arrest

A person may not use force to resist a lawful arrest, even if the arrest is later found to be wrongful, so long as it is lawful on its face. However, if a peace officer or private citizen uses excessive force in effecting an arrest, the arrestee may use reasonable force to defend against that excessive force. See People v. Gonzalez (1990) 51 Cal.3d 1179, 1219; People v. Adams (2009) 176 Cal.App.4th 946. Unjustified resistance to a lawful arrest is separately punishable under Penal Code § 148.

C. Engaged in Unlawful Activity

Some commentators describe a limitation barring persons engaged in serious criminal activity from invoking stand-your-ground principles. California does not have a clean statutory analogue to this rule, but the practical effect is felt through (a) the aggressor doctrine, (b) the reasonableness analysis (a jury is unlikely to find reasonable a belief formed during a planned armed robbery), and (c) felony-murder and provocative-act doctrines, which can override self-defense entirely.

D. Danger Must Still Exist

CALCRIM No. 3474 makes explicit that the right to use force in self-defense continues ONLY as long as the danger exists or reasonably appears to exist. When the attacker withdraws or is no longer capable of inflicting injury, the right ends. Force used after that point is not self-defense and will be treated as a fresh offense.

VII. Quick-Reference Summary Table

Scenario	Rule
Non-aggressor, in public, imminent threat	No duty to retreat. May use proportional force, including deadly force if facing death/GBI/forcible atrocious felony. (CALCRIM 3470/505; People v. Estrada (1923).)
Non-aggressor, in residence, forcible intruder	No duty to retreat. § 198.5 presumption of reasonable fear applies if all four elements met. (Pen. Code § 198.5; CALCRIM 3477.)
Initial aggressor (any level)	No right of self-defense UNLESS the aggressor makes a good-faith withdrawal, communicates it by word or conduct, and the opponent continues. (Pen. Code § 197(3); CALCRIM 3471.)
Initial aggressor using non-deadly force; opponent escalates to deadly force	Right of self-defense is restored without need for prior withdrawal. (People v. Quach (2004) 116 Cal.App.4th 294.)
Mutual combat	Requires actual agreement (express or implied) to fight before the claim to self-defense arose. Impulsive response to an unexpected blow is NOT mutual combat. (People v. Ross (2007) 155 Cal.App.4th 1033.)
Contrived self-defense	No right of self-defense where the defendant provoked the fight with intent to use it as a pretext for force. (CALCRIM 3472.)
Defense of property only	Reasonable, non-deadly force allowed. Deadly force is NEVER justified for property alone. (People v. Ceballos (1974) 12 Cal.3d 470; CALCRIM 3476.)
Attacker withdraws or is disabled	Right to use force ENDS. Continued force is not self-defense. (CALCRIM 3474.)
Honest but unreasonable belief	Not justifiable homicide, but reduces murder to voluntary manslaughter (imperfect self-defense). (People v. Flannel (1979) 25 Cal.3d 668; Pen. Code § 192(a); CALCRIM 571.)

Authorities Cited

Statutes

• California Penal Code § 192(a) — Voluntary manslaughter
• California Penal Code § 197 — Justifiable homicide by other persons
• California Penal Code § 198 — Bare fear insufficient; must act under influence of reasonable fears alone
• California Penal Code § 198.5 — Castle Doctrine / presumption of reasonable fear
• California Penal Code §§ 692–694 — Lawful resistance
• California Evidence Code §§ 601, 604–606 — Rebuttable presumptions affecting burden of proof

Jury Instructions (Judicial Council of California, CALCRIM 2025 ed.)

• CALCRIM No. 505 — Justifiable Homicide: Self-Defense or Defense of Another
• CALCRIM No. 506 — Justifiable Homicide: Defending Against Harm to Person Within Home
• CALCRIM No. 571 — Voluntary Manslaughter: Imperfect Self-Defense
• CALCRIM No. 3470 — Right to Self-Defense or Defense of Another (Non-Homicide)
• CALCRIM No. 3471 — Right to Self-Defense: Mutual Combat or Initial Aggressor
• CALCRIM No. 3472 — Right to Self-Defense: May Not Be Contrived
• CALCRIM No. 3474 — Danger No Longer Exists or Attacker Disabled
• CALCRIM No. 3475 — Right to Eject Trespasser From Real Property
• CALCRIM No. 3476 — Right to Defend Real or Personal Property
• CALCRIM No. 3477 — Presumption That Resident Was Reasonably Afraid of Death or Great Bodily Injury (Pen. Code § 198.5)

Case Law

• People v. Estrada (1923) 60 Cal.App. 477 — No duty of retreat on non-aggressor
• People v. Hatchett (1942) 56 Cal.App.2d 20 — Right to pursue attacker until danger passes
• People v. Hughes (1951) 107 Cal.App.2d 487 — Affirmation of no-retreat rule
• People v. Sawyer (1967) 256 Cal.App.2d 66 — Aggressor escalation doctrine
• People v. Ceballos (1974) 12 Cal.3d 470 — Deadly force and felony limitation; spring guns
• People v. Flannel (1979) 25 Cal.3d 668 — Imperfect self-defense
• People v. Trevino (1988) 200 Cal.App.3d 874 — Initial aggressor withdrawal requirements
• People v. Aris (1989) 215 Cal.App.3d 1178 — “Imminent” defined (overruled on other grounds by Humphrey)
• People v. Gonzalez (1990) 51 Cal.3d 1179 — Resisting arrest and excessive force
• People v. Brown (1992) 6 Cal.App.4th 1489 — Scope of “residence” under § 198.5
• People v. Humphrey (1996) 13 Cal.4th 1073 — Reasonableness considers all circumstances known to defendant
• People v. Quach (2004) 116 Cal.App.4th 294 — Sudden deadly escalation restores right of self-defense to non-deadly aggressor
• People v. Jefferson (2004) 119 Cal.App.4th 508 — Reasonable-person standard not adjusted for mental impairment
• People v. Randle (2005) 35 Cal.4th 987 — Imperfect defense of others
• People v. Ross (2007) 155 Cal.App.4th 1033 — Technical definition of “mutual combat”
• People v. Adams (2009) 176 Cal.App.4th 946 — Excessive force in arrests; applicable to both police and citizen arrests
• People v. Lopez (2011) 199 Cal.App.4th 1297 — Upholding CALCRIM 505

Disclaimer

The author, Jeffrey Kearnan, is not an attorney and does not practice law. Mr. Kearnan is the CEO and Managing Member of Kearnan Consulting Group, LLC, a law enforcement and security consulting firm. His work product includes premises liability expert witness services, vulnerability assessments, houses of worship security compliance, and security policy development — none of which constitutes the practice of law.

This article is a general summary of California self-defense and use-of-force law prepared for educational, research, and professional reference purposes. It is not legal advice, is not a legal opinion, and does not create an attorney-client relationship with the author, Kearnan Consulting Group, LLC, or any of its affiliates. No reader should act, or refrain from acting, on the basis of anything contained in this article without first obtaining advice from a licensed California attorney.

Self-defense cases are highly fact-specific, and the application of statutes, jury instructions, and case law to any particular incident depends on evidence, circumstances, and jurisdictional considerations that cannot be addressed in a general summary. Anyone facing criminal charges, civil exposure, or litigation involving use-of-force questions — whether as a party, witness, employer, or property owner — should consult qualified legal counsel.

Statutory and case citations are current as of the preparation date and were independently verified against primary sources (California Penal Code via leginfo.legislature.ca.gov, CALCRIM 2025 edition via the Judicial Council of California, and published appellate opinions). Readers should nevertheless independently verify each citation before relying on it in any filing, report, publication, or operational decision, as statutes and jury instructions are subject to amendment.