In a California civil case, the discovery cutoff falls 30 days before the date initially set for trial. That one sentence hides several traps: the deadline anchors to the original trial date even after a continuance, written discovery has to go out weeks earlier to land before the cutoff, and a separate 45-day clock on motions to compel can quietly waive your right to challenge evasive responses. Expert discovery runs on its own tighter schedule, and missing any of these dates can mean losing evidence, losing an expert, or losing the case.
The 30-Day Rule and Why “Initially” Matters
Under Code of Civil Procedure section 2024.020, every party has the right to complete discovery on or before the 30th day before the date initially set for trial. Discovery motions must be heard, not just filed, no later than 15 days before that same initial trial date.1California Legislative Information. California Code CCP 2024.020 Because court calendars rarely let you walk in with a motion for next week, the practical filing date is usually several weeks earlier.
The word “initially” is doing heavy work. The cutoff is tied to the first trial date the court sets, not the current one. If trial gets moved, the deadline does not drift with it unless something affirmative happens to reopen discovery.
Working Backward From the Cutoff
Written discovery has to be served early enough that responses come back before the cutoff. Interrogatories, requests for admission, and document demands all carry a 30-day response window. Service by mail inside California adds five calendar days.2California Legislative Information. California Code CCP 1013 That means written discovery served by mail generally needs to leave your office at least 65 days before trial so the response arrives before the 30-day cutoff, with a little room left to move on any inadequate answers.3California Courts | Self Help Guide. Request Discovery From a Party in Your Case
Depositions are no different. The notice has to go out early enough that the deposition itself can be completed by the cutoff, and if a motion to compel attendance becomes necessary, you need that heard by the 15-day motion deadline too.
Expert Witness Discovery Runs on a Tighter Clock
Expert witnesses have their own schedule. A party who wants to exchange expert information serves a written demand, and the exchange date is set at 50 days before the initial trial date, or 20 days after service of the demand, whichever falls closer to trial.4California Legislative Information. California Code CCP 2034.230 Expert-related discovery itself must be completed by the 15th day before trial, and motions concerning expert discovery must be heard by the 10th day before trial.5California Legislative Information. California Code CCP 2024.030
Blowing an expert deadline carries a specific penalty. If a party unreasonably fails to list an expert, submit an expert declaration, produce the expert’s reports, or make the expert available for deposition, the court must exclude that expert’s testimony when the opposing party objects and has complied with the exchange rules.6California Legislative Information. California Code CCP 2034.300 In a case where expert testimony is required to prove liability, that single ruling can end the case.
A party who missed the exchange can move for permission to submit expert information late. The motion has to be filed early enough that resulting expert depositions can still finish before the overall cutoff, though a court may allow a later motion in exceptional circumstances.7California Legislative Information. California Code CCP 2034.710 It requires a meet-and-confer declaration.
A Trial Continuance Does Not Reopen Discovery
This one catches litigants constantly. When the court grants a continuance and pushes trial out, the discovery cutoff does not slide forward with it.1California Legislative Information. California Code CCP 2024.020 The cutoff stays anchored to the original trial date. A lawyer who assumes the new date generates a new 30-day window may discover that discovery actually closed months ago.
To get discovery open again, you need one of two things: a motion under section 2024.050, or a written agreement with all affected parties under section 2024.060. Neither happens on its own.
Motion to Reopen Under CCP 2024.050
The motion asks the court to permit discovery closer to trial or to reopen it entirely. It has to include a meet-and-confer declaration showing a good-faith effort to resolve the dispute informally.8California Legislative Information. California Code CCP 2016.040 The court weighs several factors:9California Legislative Information. California Code CCP 2024.050
- The necessity for the additional discovery and what it is expected to produce.
- The diligence of the party seeking it during the original discovery window.
- Any prejudice to the other side or likelihood of pushing the trial date.
- The length of time between the original and current trial dates.
Judges focus heavily on diligence. A party that sat on written discovery for months and then asks for more time will struggle. One that was blindsided by newly surfaced evidence or a witness who became unexpectedly unavailable has a much better case. The losing side on this motion faces mandatory monetary sanctions unless the court finds substantial justification.9California Legislative Information. California Code CCP 2024.050
Written Stipulation Under CCP 2024.060
Parties can agree among themselves to extend or reopen discovery as long as every affected party consents. The agreement must be confirmed in writing and specify the new deadline.10California Legislative Information. California Code CCP 2024.060 The limit: the parties cannot force the court to continue the trial. If their new deadline runs past the trial date, the court is not required to accommodate them.
The 45-Day Motion to Compel Window
This is where cases quietly fall apart. If you receive inadequate responses to interrogatories or a document demand, you have 45 days from service of those responses to file a motion to compel a further response. Miss that window and you waive the right to compel entirely.11California Legislative Information. California Code CCP 2030.300 The same 45-day rule governs motions to compel further responses to document demands.12California Legislative Information. California Code CCP 2031.310 A written agreement can extend that deadline, but absent one, 45 days is a hard wall. The motion also requires a meet-and-confer declaration, and courts deny motions filed without a genuine effort to resolve the dispute first.
The 45-day rule and the overall cutoff can collide. Serve written discovery late in the case, get evasive responses, and your 45-day window may extend past the discovery cutoff. At that point you would need both a timely motion to compel and permission to have it heard after the cutoff, which is a difficult posture to be in.
Sanctions for Missing or Abusing Discovery
California courts have a graduated set of tools, and they use them.
Monetary sanctions. The most common response is an order requiring the offending party or their attorney to pay the other side’s reasonable expenses, including attorney fees, caused by the misuse. When the discovery statutes authorize monetary sanctions, the court must impose them unless it finds the sanctioned party acted with substantial justification or that sanctions would otherwise be unjust.13California Legislative Information. California Code CCP 2023.030 The losing party on a motion to compel or a motion to extend discovery will almost always pay something.
Issue and evidence sanctions. When money is not enough, the court can treat specified facts as established against the noncompliant party, bar that party from supporting or opposing certain claims, or prohibit the introduction of designated evidence at trial.13California Legislative Information. California Code CCP 2023.030 A party unable to introduce the medical records that prove injury, or the financial records that prove damages, often cannot win regardless of what the jury hears on other points.
Terminating sanctions. In the worst cases, the court can strike pleadings, dismiss claims, or enter a default judgment.13California Legislative Information. California Code CCP 2023.030 Courts generally reserve this for repeated violations of court orders or sustained obstruction, not a single late response.
Where the Standard Cutoff Does Not Apply
Two situations run on different rules. In unlawful detainer actions, the response time for written discovery is five days rather than 30, and depositions must be scheduled at least five days after notice but no later than five days before trial.14California Courts | Self Help Guide. Respond to a Request for Discovery in a Court Case Eviction litigants have almost no margin.
In federal court, there is no statutory cutoff tied to the trial date at all. The judge issues a scheduling order under Federal Rule of Civil Procedure 16(b) that sets case-specific deadlines for completing discovery, amending pleadings, and filing motions.15Legal Information Institute. Federal Rules of Civil Procedure Rule 16 – Pretrial Conferences, Scheduling, Management Modifying that order requires good cause, generally meaning the deadline could not reasonably be met despite diligence. If your case is in federal court, your deadlines come from the judge’s order, not from the Code of Civil Procedure.