To file a motion to extend discovery deadlines, submit a written request to the court before the current cutoff expires, show good cause by documenting your diligence and the specific obstacles you’ve hit, confer with opposing counsel first, and attach a proposed order with a concrete new timeline. Under Federal Rule of Civil Procedure 16(b)(4), a scheduling order can only be modified for “good cause and with the judge’s consent,” and courts measure good cause primarily by whether you pursued discovery on schedule.1Legal Information Institute. Federal Rules of Civil Procedure Rule 16 – Pretrial Conferences; Scheduling; Management File early. The standard gets dramatically harder once the deadline has passed.
File Before the Cutoff
Timing is the single most important factor. Rule 6(b)(1) creates two paths, and they are not equivalent.
If you file before the deadline expires, Rule 6(b)(1)(A) allows the court to extend the time “for good cause” with or without a formal motion.2Legal Information Institute. Federal Rules of Civil Procedure Rule 6 – Computing and Extending Time; Time for Motion Papers You still need to justify the request, but the judge has broad discretion.
If the deadline has already passed, Rule 6(b)(1)(B) requires you to show that missing it resulted from “excusable neglect.” That’s a substantially higher bar, and attorneys who see trouble coming almost always file early rather than risk the tougher standard. If a deadline is approaching and you know you won’t make it, file now.
What Good Cause Actually Means
The advisory committee notes to Rule 16 explain that good cause exists when the deadline “cannot reasonably be met despite the diligence of the party seeking the extension.” Courts focus on what you did, not just what went wrong.
Situations that typically satisfy good cause:
- A key witness becomes unavailable due to illness or relocation.
- The opposing party produces documents late or in massive volume.
- Newly discovered evidence changes the scope of the case.
- Third-party subpoena responses are delayed.
What links these is that the obstacle wasn’t something better planning would have avoided.
Situations that typically fail: starting depositions late without explanation, waiting months to review documents that were available early, or simply underestimating how long the case would take. Judges see hundreds of these motions and can tell the difference between a genuine obstacle and poor case management. Your motion needs a specific timeline showing when you identified the problem and what you did about it.
Talk to Opposing Counsel First
Before filing, discuss the situation with opposing counsel. The Federal Rules don’t explicitly require a meet and confer for scheduling modifications the way Rule 37(a)(1) does for motions to compel, but most local court rules impose that requirement for any discovery-related filing.3Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions Some judges will deny your motion outright if you skip this step.
The goal of the call is to see whether the other side will agree to a new schedule. If they do, you can file a joint stipulation, which the court is far more likely to approve quickly and without a hearing. Under Rule 29, parties can stipulate to modify discovery procedures, but any stipulation affecting deadlines the court has set still needs the court’s approval. Even when everyone agrees, file the stipulation for approval rather than treating the deadline as extended by handshake.
If opposing counsel refuses to agree or won’t return your calls, document every attempt. Keep a log of dates, times, and the substance of each communication. Your motion should include a certification describing those efforts.
What Goes in the Motion
The motion needs to accomplish three things: explain what discovery remains incomplete, demonstrate that you pursued it diligently, and propose a specific new timeline. Vague requests for “additional time” rarely succeed.
Start with the procedural history. Identify the date of the original scheduling order issued under Rule 16(b), the current discovery cutoff, and exactly how much additional time you need. Then list the specific items still outstanding: pending depositions, unanswered interrogatories, document requests being processed, expert reports not yet completed. Specificity is what carries the motion.
Support the request with declarations or sworn statements describing the obstacles. If a witness canceled a deposition three times, attach the correspondence showing each scheduling attempt. If the opposing party produced 50,000 pages of documents two weeks before the cutoff, include the production log. These details give the judge a factual basis for finding good cause instead of asking the court to take your word for it.
The Proposed Order
Submit a proposed order alongside the motion. This is a draft the judge can sign if the request is granted. It should spell out the new discovery cutoff and any adjusted deadlines for specific tasks like document production or expert disclosures. A clean, ready-to-sign order makes the judge’s job easier and shows you’ve thought through what you actually need.
Don’t Forget Expert Deadlines
Discovery extensions often ripple into expert witness timelines. Under Rule 26(a)(2)(D), expert disclosures follow whatever sequence the court sets; when no order says otherwise, the defaults are 90 days before trial for initial expert reports and 30 days after the opposing party’s expert disclosure for rebuttal reports.4Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery If your extension pushes into the expert disclosure window, address it in the motion. Otherwise you can end up with more time to gather facts and no time to have an expert analyze them.
Account for the Trial Date
The scheduling order typically sets dates for dispositive motions, expert disclosures, the final pretrial conference, and trial itself. If your extension won’t affect those, say so explicitly. If it will, propose adjusted dates for the downstream milestones. Judges are far more receptive to a motion that acknowledges the broader impact and offers a workable alternative than one that ignores the fact that trial is eight weeks away.
Filing and Serving the Motion
In federal court, motions are filed electronically through the Case Management/Electronic Case Files (CM/ECF) system.5United States Courts. Electronic Filing (CM/ECF) Most federal district courts don’t charge a separate filing fee for non-dispositive motions like a discovery extension request. State courts vary; some charge a small fee for each motion. Check the fee schedule before filing to avoid a rejected submission.
Under Rule 5, every written motion must be served on all other parties. Filing through CM/ECF automatically sends a notice of electronic filing to all registered attorneys, and no separate certificate of service is required for that electronic notice.6Legal Information Institute. Federal Rules of Civil Procedure Rule 5 – Serving and Filing Pleadings and Other Papers If any party isn’t registered for electronic filing, serve them by other means and file a certificate of service with the court. Save your filing confirmation as proof the submission occurred before the discovery cutoff.
What Happens After You File
The opposing party has an opportunity to respond. The specific deadline for responses to non-dispositive motions varies by local rule, so check your court’s requirements. If the opposition argues the extension would cause unfair prejudice, the judge may schedule a hearing.
Prejudice here means something specific: the opposing party would be unable to adequately prepare because the extension disrupts their ability to depose witnesses, investigate evidence, or meet their own deadlines. A general objection that more discovery is inconvenient usually won’t carry the day.
The judge has three options. Grant the motion in full. Deny it entirely. Or grant a partial extension shorter than what you requested, in which case the court typically identifies which discovery tasks to prioritize within the compressed window. If granted, the court issues an amended scheduling order that replaces the old deadlines.
If the Deadline Has Already Passed
Missing the cutoff triggers the excusable neglect standard under Rule 6(b)(1)(B). The Supreme Court defined this test in Pioneer Investment Services Co. v. Brunswick Associates, and courts weigh four factors together:
- Prejudice to the opposing party from the delay.
- Length of the delay and its effect on the court’s schedule.
- Reason for the delay and whether it was within your reasonable control. This factor carries the most weight.
- Whether you acted in good faith rather than for tactical advantage.
Courts treat this as an equitable test, weighing all four factors together rather than treating any single one as dispositive. That said, if the reason for missing the deadline was entirely within your control, like forgetting about it or choosing to prioritize other cases, the motion is almost certainly going to fail. Excusable neglect exists as a safety valve for genuine problems, not a second chance for poor planning.
What You’re Avoiding by Filing
The consequences of missing a discovery deadline without an extension are useful motivation for filing the motion on time. Rule 37 gives courts a wide range of tools, and some of them can end a case.
The most common sanction is evidence preclusion. Under Rule 37(c)(1), if you fail to disclose information or identify a witness as required by Rule 26(a) or (e), you’re barred from using that information or witness at a hearing or trial unless the failure was substantially justified or harmless.3Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions The evidence might exist. You just can’t use it.
Beyond preclusion, courts can impose escalating sanctions for disobeying discovery orders:
- Adverse inference, where the court treats disputed facts as established against you.
- Claim or defense restrictions prohibiting you from supporting or opposing specific claims.
- Striking pleadings, removing parts or all of your complaint or answer.
- Dismissal or default judgment, deciding the case against you entirely.
- Monetary sanctions, requiring you or your attorney to pay the other side’s reasonable expenses caused by the failure, including attorney’s fees.
Sanctions typically escalate. A first-time miss might mean a motion to compel and an order to pay the other side’s fees for bringing it. Repeated failures or defiance of court orders can trigger the more severe consequences. Filing a motion to extend discovery, even when it feels like an admission that your case isn’t where it should be, is vastly preferable to the alternative.