Pennsylvania Jury Selection and Trial Process: What Litigants Need to Know

Pennsylvania jury selection and trial procedure are governed by a framework of constitutional provisions, state statutes, and procedural rules that apply differently depending on whether a case proceeds in civil or criminal court. The process begins well before opening statements, with jury pool assembly and voir dire shaping which citizens decide the outcome. Understanding the structural phases — from venire summoning through verdict and post-trial motions — is essential for litigants, attorneys, and researchers navigating Pennsylvania's legal system.

Definition and scope

Pennsylvania jury trials are conducted in the Courts of Common Pleas, the trial courts of general jurisdiction established under Article V of the Pennsylvania Constitution. The right to a jury trial in criminal cases is guaranteed by both the Sixth Amendment to the U.S. Constitution and Article I, Section 9 of the Pennsylvania Constitution. In civil cases, Article I, Section 6 preserves the right to a jury where it existed at common law.

Criminal juries in Pennsylvania consist of 12 jurors, with unanimous verdicts required for conviction (Pennsylvania Rules of Criminal Procedure, Rule 648). Civil juries may consist of 6 to 12 jurors depending on the case type and any stipulations between parties, governed by the Pennsylvania Rules of Civil Procedure, Rule 220.

Scope limitations: This page addresses jury selection and trial procedure as conducted in Pennsylvania Courts of Common Pleas under state law. It does not cover federal jury trials conducted in the Eastern, Middle, or Western Districts of Pennsylvania, which operate under the Federal Rules of Civil Procedure and Federal Rules of Criminal Procedure. Bench trials (non-jury proceedings), arbitration, and administrative hearings fall outside the scope of this page. For the broader regulatory landscape governing Pennsylvania courts, see the regulatory context for the Pennsylvania legal system.

How it works

The trial process in Pennsylvania follows a sequence of discrete, rule-governed phases.

1. Venire assembly. The county court randomly selects prospective jurors from voter registration rolls and driver's license records under 42 Pa. C.S. § 4521. Each county administers its own jury pool through the Court of Common Pleas jury selection office.

2. Voir dire. Attorneys and, in many counties, the judge question prospective jurors to identify bias, conflicts of interest, or disqualifying relationships. Pennsylvania allows both unlimited challenges for cause and a fixed number of peremptory challenges. In capital cases, each side receives 20 peremptory challenges; in non-capital felony cases, the number is 7 per side (Pa. R. Crim. P. 634).

3. Opening statements. Each party delivers a non-evidentiary summary of what the evidence will show. The prosecution or plaintiff proceeds first.

4. Presentation of evidence. Witnesses testify and physical evidence is introduced under the Pennsylvania Rules of Evidence, which are closely modeled on the Federal Rules of Evidence but contain Pennsylvania-specific provisions, particularly regarding hearsay exceptions and privilege.

5. Closing arguments. Counsel summarizes the evidence and argues the applicable legal standards. In criminal cases, the prosecution argues last.

6. Jury instructions. The judge charges the jury using the Pennsylvania Suggested Standard Civil or Criminal Jury Instructions (published by the Pennsylvania Bar Institute), explaining the burden of proof and applicable law.

7. Deliberation and verdict. The jury deliberates in private. Criminal verdicts require unanimity among all 12 jurors. Civil verdicts require agreement of 5 out of 6 jurors, or 10 out of 12 where a 12-member civil jury is seated.

8. Post-trial motions. After verdict, parties may file motions for a new trial or for judgment notwithstanding the verdict within 10 days of the verdict under Pa. R. Civ. P. 227.1.

Common scenarios

Criminal felony trials in Courts of Common Pleas involve 12-member juries and require proof beyond a reasonable doubt. Defendants charged with offenses carrying potential sentences exceeding six months of incarceration have an absolute right to jury trial. For the full sentencing framework applicable after conviction, see Pennsylvania criminal sentencing guidelines.

Civil jury trials arise in tort, contract, and property disputes. Plaintiffs must demonstrate liability by a preponderance of the evidence — a lower standard than criminal burden — and juries award compensatory and, in appropriate cases, punitive damages.

Capital cases represent the most procedurally intensive category. Pennsylvania capital trials are bifurcated: the guilt phase proceeds first, followed by a separate penalty phase if the jury returns a guilty verdict on first-degree murder. The penalty phase jury weighs aggravating and mitigating circumstances under 42 Pa. C.S. § 9711.

Juvenile proceedings in Pennsylvania are generally not jury trials; adjudications are conducted by judges in the Juvenile Court division of the Court of Common Pleas. See Pennsylvania juvenile justice system for the distinct procedural framework.

Decision boundaries

The critical procedural distinctions that determine how jury selection and trial unfold in Pennsylvania include:

• Civil vs. criminal: Burden of proof, jury size requirements, unanimity rules, and peremptory challenge allocations all differ between the two tracks.
• Felony vs. summary offense: Summary offense trials before a Magisterial District Judge are bench proceedings — no jury right attaches under Pennsylvania law for offenses where the maximum sentence does not exceed 90 days (42 Pa. C.S. § 1515).
• Waiver: In Pennsylvania, criminal defendants may waive their right to a jury trial with court approval under Pa. R. Crim. P. 620; civil parties may stipulate to a bench trial or to a reduced-size jury.
• Grand jury vs. petit jury: The grand jury evaluates probable cause to indict; the petit (trial) jury determines guilt or liability. These are structurally separate bodies. The Pennsylvania grand jury system page addresses the investigative grand jury process under 42 Pa. C.S. §§ 4541–4553.
• County variation: Individual counties maintain local rules that affect voir dire procedures, juror questionnaires, and scheduling. Philadelphia County and Allegheny County operate under particularly detailed local rules that supplement the statewide framework.

References

• Pennsylvania Constitution, Article I and Article V — Pennsylvania General Assembly
• Pennsylvania Rules of Criminal Procedure — Pennsylvania Courts (Unified Judicial System)
• Pennsylvania Rules of Civil Procedure — Pennsylvania Courts (Unified Judicial System)
• Pennsylvania Rules of Evidence — Pennsylvania Courts (Unified Judicial System)
• 42 Pa. C.S. Title 42 (Judiciary and Judicial Procedure) — Pennsylvania General Assembly
• Pennsylvania General Assembly — Legislative Information System
• Unified Judicial System of Pennsylvania — Pennsylvania Courts