Summary Judgment: A Practitioner's Guide to Rule 56 and the Celotex Trilogy

Summary judgment is the most powerful tool in a litigator's pretrial arsenal. It allows a court to resolve a case — or discrete claims within it — without a trial, based on the evidentiary record developed through discovery. Under Federal Rule of Civil Procedure 56, the court must grant summary judgment when the movant shows there is no genuine dispute of material fact and the movant is entitled to judgment as a matter of law.

That word "must" matters. Summary judgment is not discretionary. If the movant meets the standard, the court is required to enter judgment. This makes understanding the standard, the burden-shifting framework, and the practical strategy behind it essential for any litigator on either side of the motion.

This guide covers the federal standard, the three Supreme Court decisions that define modern summary judgment practice, state court variations — including the major 2026 Texas reform — and practical strategy for both movants and non-movants.

This article is for general information and is not legal advice. For guidance on a specific case, consult a licensed attorney in your jurisdiction.

The Federal Standard Under Rule 56

Rule 56(a) states the standard plainly: "The court shall grant summary judgment if the movant shows that there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law."

Two requirements, both mandatory:

1. No genuine dispute of material fact. A fact is "material" if it could affect the outcome of the case under the governing law. A dispute is "genuine" if the evidence is such that a reasonable jury could return a verdict for the non-moving party.

2. Entitlement to judgment as a matter of law. Even without disputed facts, the movant must show that the undisputed facts entitle them to win as a legal matter.

Under the Supreme Court's interpretation in Anderson v. Liberty Lobby, the court's job at summary judgment is not to weigh evidence or make credibility determinations — Rule 56 itself does not state this, but the trilogy cases make it clear. The court views all evidence in the light most favorable to the non-movant and draws all reasonable inferences in their favor. If, after doing so, no reasonable factfinder could rule against the movant, summary judgment is appropriate.

The 1986 Summary Judgment Trilogy

Modern summary judgment practice was shaped by three Supreme Court decisions issued in the same year. Together, Celotex, Anderson, and Matsushita form the "summary judgment trilogy" — the most-cited decisions in the history of the federal court system, with Anderson and Celotex each accumulating over 70,000 federal court citations. Each decision clarified a different aspect of the standard.

Celotex Corp. v. Catrett — The Movant's Burden

Celotex Corp. v. Catrett, 477 U.S. 317 (1986) addressed the critical question: what does the movant have to show to satisfy its initial burden?

The case arose from an asbestos exposure claim. Celotex moved for summary judgment arguing that the plaintiff, Catrett, had no evidence that decedent was exposed to Celotex's products. The D.C. Circuit reversed the district court's grant of summary judgment, holding that Celotex had not submitted affidavits or other evidence supporting its motion.

The Supreme Court reversed and remanded. Justice Rehnquist's majority opinion established that a party moving for summary judgment does not need to produce evidence negating the opponent's claims. When the non-movant bears the burden of proof at trial, the movant can satisfy its initial burden simply by "pointing out to the district court that there is an absence of evidence to support the nonmoving party's case." 477 U.S. at 325.

The practical takeaway: If your opponent will bear the burden of proof at trial, your summary judgment motion does not need to include affidavits, depositions, or any evidence at all. You can move for summary judgment by demonstrating — through the record — that your opponent cannot prove an essential element of their case. The burden then shifts to the non-movant to come forward with specific evidence.

Anderson v. Liberty Lobby — Defining "Genuine" and "Material"

Anderson v. Liberty Lobby, Inc., 477 U.S. 242 (1986) gave substance to the terms "genuine dispute" and "material fact."

The case involved a defamation suit by Liberty Lobby against Jack Anderson, publisher of The Investigator magazine. Because the District Court held that Liberty Lobby and its founder were limited-purpose public figures, they had to prove "actual malice" by clear and convincing evidence — a higher standard than preponderance. The question was whether that heightened substantive standard affected the summary judgment analysis.

The Court held that it did. Justice White's opinion established two key principles:

"Material" facts are those that might affect the outcome of the suit under the governing law. Factual disputes that are irrelevant to the legal claim — even if genuinely contested — do not defeat summary judgment.

"Genuine" disputes exist only if the evidence is "such that a reasonable jury could return a verdict for the nonmoving party." 477 U.S. at 248. The Court drew an explicit connection to the directed verdict standard: if no reasonable jury could find for the non-movant, summary judgment is appropriate.

The practical takeaway: The non-movant cannot defeat summary judgment by showing that some facts are disputed. The disputed facts must be material to the legal claim, and the dispute must be genuine — supported by evidence sufficient that a reasonable factfinder could side with the non-movant, judged against the applicable substantive evidentiary standard.

Matsushita Electric v. Zenith Radio — The "Implausible Inference" Rule

Matsushita Electric Industrial Co. v. Zenith Radio Corp., 475 U.S. 574 (1986) addressed what happens when the non-movant's theory requires the court to draw implausible inferences from the evidence.

American television manufacturers sued Japanese competitors alleging a decades-long conspiracy to fix artificially low prices in the U.S. market — effectively a predatory pricing conspiracy. The defendants moved for summary judgment.

The Court held that while courts must draw reasonable inferences in favor of the non-movant, they are not required to draw implausible inferences. The plaintiffs' theory — that Japanese manufacturers conspired for twenty years to sell below cost in the U.S. — was economically irrational. The Court stated that "[w]here the record taken as a whole could not lead a rational trier of fact to find for the nonmoving party, there is no 'genuine issue for trial.'" 475 U.S. at 587.

The practical takeaway: The non-movant's evidence must do more than create a theoretical possibility of a dispute. If the non-movant's theory is implausible in light of the full evidentiary record — if it requires inferences that no reasonable factfinder would draw — summary judgment is proper even if some evidence technically supports the theory.

The Burden-Shifting Framework in Practice

The trilogy established a burden-shifting framework that governs every federal summary judgment motion.

Step 1: The Movant's Initial Burden

The movant bears the initial burden of production. How they satisfy it depends on who bears the burden of proof at trial:

• If the movant would bear the burden of proof at trial (e.g., a plaintiff moving for summary judgment on their own claim): the movant must present evidence so overwhelming that no reasonable jury could find against them.

• If the non-movant bears the burden of proof at trial (the more common scenario for defendants): the movant can satisfy its initial burden by pointing to the absence of evidence supporting the non-movant's case. No affidavits or additional evidence are required (Celotex).

Step 2: The Burden Shifts to the Non-Movant

Once the movant satisfies its initial burden, the non-movant must come forward with specific facts showing that a genuine dispute exists for trial. The non-movant cannot rely on:

• Mere allegations or denials in the pleadings
• Conclusory assertions without evidentiary support
• Evidence that raises only a "metaphysical doubt" about a material fact (Matsushita, 475 U.S. at 586)

Rule 56(c)(1) specifies acceptable evidence: depositions, documents, electronically stored information, affidavits or declarations, stipulations, admissions, and interrogatory answers.

Step 3: The Court's Assessment

The court then evaluates whether, viewing the evidence in the light most favorable to the non-movant and drawing all reasonable inferences in their favor, a reasonable jury could find for the non-movant. Credibility determinations are off-limits. The court identifies facts and inferences — it does not weigh them.

Partial Summary Judgment and Cross-Motions

Partial Summary Judgment

Rule 56(a) expressly authorizes summary judgment "on all or part of" a claim or defense. Courts regularly use partial summary judgment to:

• Resolve liability and leave damages for trial. If there is no genuine dispute that the defendant is liable but the amount of damages is contested, the court can grant summary judgment on liability and conduct a trial only on damages.
• Narrow the issues. By resolving undisputed legal questions or eliminating claims with no evidentiary support, partial summary judgment streamlines what the jury must decide.
• Dispose of affirmative defenses. If the evidence conclusively defeats a defense (e.g., statute of limitations), the court can remove it from the case.

Cross-Motions for Summary Judgment

When both sides move for summary judgment, each motion is evaluated independently on its own merits. The fact that both parties claim there is no genuine dispute does not mean the court must grant one of the motions. It is possible — common, in fact — for the court to deny both.

Each cross-motion is assessed under the same standard: the court views the evidence in the light most favorable to the opposing party on each motion. The movant's burden does not change just because the other side also moved.

Summary Judgment vs. Motion to Dismiss

Summary judgment and motions to dismiss under Rule 12(b)(6) are both pretrial disposition tools, but they operate at different stages and under different standards:

When to use which: A motion to dismiss is the right tool when the complaint itself is legally deficient — the plaintiff's own allegations, taken as true, do not state a claim. Summary judgment is the right tool when the allegations might state a claim on paper, but the evidence developed through discovery does not support it.

State Court Variations

The federal Rule 56 framework does not automatically apply in state court. Each state has its own procedural rules, and the differences are substantive — not just cosmetic.

States Tracking the Federal Model

Many states have adopted summary judgment rules that closely mirror Rule 56 and apply the Celotex burden-shifting framework. But "closely mirrors" does not mean "identical." Always confirm the specific standard in your jurisdiction — the movant's initial burden, the non-movant's response obligations, and the applicable evidentiary rules can differ in ways that affect strategy.

California: CCP § 437c

California's summary judgment procedure under Code of Civil Procedure § 437c diverges from the federal model in several important ways:

• The movant must make an affirmative showing — but can point to gaps in the plaintiff's evidence. Under the California Supreme Court's framework in Aguilar v. Atlantic Richfield Co. (2001), a defendant can meet its initial burden by showing that the plaintiff does not possess, and cannot reasonably obtain, evidence sufficient to establish an essential element. This is closer to the federal Celotex approach than New York's stricter requirement (discussed below), though California's statutory framework under § 437c(p)(2) has its own procedural requirements.
• Separate statement requirement. The movant must file a separate statement of undisputed material facts, and the opposing party must file a responsive separate statement. This requirement is strictly enforced.
• 81-day notice. The motion must be served at least 81 days before the hearing date (extended from 75 days by a 2024 amendment effective January 1, 2025).

2026 Texas Reform: The Overhaul of Rule 166a

On March 1, 2026, Texas implemented a sweeping overhaul of its summary judgment rule — the most significant reform to Texas civil procedure in years. The amended Rule 166a replaces the previous hearing-date-driven system with a filing-date-driven framework that brings Texas practice closer to the federal model.

Key changes:

• Briefing deadlines tied to filing, not hearing. The non-movant's response is due 21 days after the motion is filed. The movant's reply is due 7 days after the response. This eliminates the ambiguity of the old hearing-date-based system.
• Formal definitions. For the first time, the rule formally defines "traditional" and "no-evidence" motions for summary judgment and authorizes combined motions.
• Mandatory ruling deadline. Courts must rule within 90 days after the hearing or written submission — ending the widespread problem of summary judgment motions sitting unresolved for months.
• Reply scope limits. Movants cannot raise new summary judgment grounds in a reply brief, except to address amended pleadings filed after the motion.
• Continuance discipline. Non-movants seeking additional discovery time must now support the request with a declaration or affidavit detailing why they cannot present essential facts.

Practical impact for Texas practitioners: The new deadlines require faster turnaround. Under the old rule, practitioners often waited for a hearing to be set before preparing a response. Now, the 21-day clock starts running the moment the motion is filed.

New York: CPLR § 3212

New York applies its own summary judgment framework under CPLR § 3212. Under the standard articulated by the Court of Appeals in Alvarez v. Prospect Hospital, 68 N.Y.2d 320 (1986), the movant must make a "prima facie showing of entitlement to judgment as a matter of law" through admissible evidence. The movant must affirmatively demonstrate — through evidence, not just argument — that no material issues of fact exist. If the movant meets this burden, the non-movant must produce admissible evidence raising a triable issue of fact.

New York's approach is somewhat more demanding of movants than the federal Celotex standard, though the practical difference is often narrow.

Common Pitfalls and Practical Strategy

For Movants

Draft a clean statement of undisputed facts. Most federal courts (and many state courts) require a separate statement of material facts with citations to the record. Each fact should be narrow, clearly supported by the cited evidence, and genuinely undisputed. Overreaching — asserting facts that the record does not clearly support — invites denial.

Anticipate the opposition. Your motion should preemptively address the strongest arguments the non-movant will raise. If there is a piece of evidence that creates a colorable dispute, explain why it does not create a genuine dispute under the Anderson standard or why the inference it supports is implausible under Matsushita.

Move early, but not too early. Rule 56(b) allows a motion "at any time until 30 days after the close of all discovery" unless a local rule or court order sets a different deadline. Moving before the non-movant has had adequate discovery invites a Rule 56(d) continuance request — and courts grant them readily.

Consider partial summary judgment. If you cannot win on the entire case, identify claims, defenses, or issues where the evidence is one-sided. Narrowing the case before trial can be just as valuable as eliminating it entirely.

For Non-Movants

Respond with specific evidence, not rhetoric. The most common reason non-movants lose is failing to cite specific evidence creating a genuine dispute. General assertions that "discovery is ongoing" or "the facts are in dispute" will not defeat a well-supported motion.

Attack the statement of undisputed facts line by line. Identify each fact you dispute, cite the specific evidence that creates the dispute, and explain why the dispute is material. Courts that require responsive statements of fact will often deem admitted any facts the non-movant fails to specifically address.

Use Rule 56(d) if discovery is genuinely incomplete. If you need additional discovery to oppose the motion, file a declaration under Rule 56(d) explaining what evidence you need, why you have not obtained it, and how it would create a genuine dispute. Courts are generally receptive to these requests when made in good faith and with specificity.

Do not rely on credibility arguments. At summary judgment, the court does not make credibility determinations. Arguing that the movant's witnesses are not credible is not a substitute for presenting your own evidence.

Appellate Review

Appellate courts review grants of summary judgment de novo, meaning they give no deference to the trial court's legal conclusions. On review, the appellate court applies the same Rule 56 standard as the trial court — viewing the evidence in the light most favorable to the non-movant, drawing all reasonable inferences in their favor, and determining independently whether a genuine dispute of material fact exists.

This makes summary judgment denials difficult to appeal. In most circuits, the denial of summary judgment is not a "final decision" under 28 U.S.C. § 1291 and is therefore not immediately appealable. Exceptions exist — most notably for qualified immunity and absolute immunity under the collateral order doctrine, and through certified interlocutory appeals under 28 U.S.C. § 1292(b) — but as a general rule, if the trial court denies summary judgment, the case proceeds to trial.

Researching Summary Judgment Effectively

Building or opposing a summary judgment motion is one of the most research-intensive tasks in litigation. You need to find controlling authority on the applicable standard in your jurisdiction, identify analogous cases where similar evidence was or was not sufficient to create a genuine dispute, and confirm that every case you cite is still good law.

AI-powered legal research tools like CaseRead can streamline this process by searching actual case law databases rather than generating text from patterns. When you need to find how courts in your circuit have applied the Celotex burden framework to facts similar to yours — or identify the specific evidentiary showings that have survived summary judgment in your practice area — grounded research tools eliminate the hallucination risk that comes with general-purpose AI and get you to controlling authority faster.

FAQ

What is summary judgment?

Summary judgment is a procedural tool that allows a court to resolve a case — or specific claims — without a full trial. Under Rule 56, the court must grant summary judgment when the movant shows there is no genuine dispute of material fact and the movant is entitled to judgment as a matter of law.

What is the Celotex standard?

The Celotex standard, from Celotex Corp. v. Catrett, 477 U.S. 317 (1986), holds that a movant does not need to produce evidence negating the opponent's claims. When the non-movant bears the burden of proof, the movant can satisfy its initial burden by pointing to the absence of evidence supporting the non-movant's case.

What is the difference between summary judgment and a motion to dismiss?

A motion to dismiss tests the legal sufficiency of the complaint — the court assumes the allegations are true. Summary judgment tests the evidentiary record — the court asks whether, after discovery, the evidence actually supports the claims. Summary judgment comes later in the case, considers a fuller record, and typically results in a final judgment if granted.

Can summary judgment be granted on some claims but not others?

Yes. Rule 56(a) allows partial summary judgment on "all or part of" a claim or defense. Courts commonly grant partial summary judgment to resolve liability while leaving damages for trial, or to eliminate weak claims from a case before trial.

What is the standard of review for summary judgment on appeal?

Appellate courts review grants of summary judgment de novo. The appellate court applies the same standard as the trial court, viewing the evidence most favorably to the non-movant and giving them the benefit of all reasonable inferences.

Do all states follow the federal summary judgment standard?

No. While many states track the federal framework, significant differences exist. California applies its own burden-shifting framework under CCP § 437c, as interpreted by Aguilar v. Atlantic Richfield Co. (2001). Texas overhauled its summary judgment rule in March 2026, adding filing-date-based deadlines and mandatory ruling timelines. New York applies a "prima facie showing" standard under Alvarez v. Prospect Hospital that is somewhat more demanding of movants than the federal Celotex standard.