You want one number. Here it is: most Missouri car accident cases resolve in 6 to 18 months. A clear-fault case with moderate injuries can settle in a few months. A disputed case that reaches trial can run two years or more.

That range is wide because the timeline is not one clock. It is seven shorter clocks, and each one starts, stalls, or stops for reasons you can often influence. This guide walks through every phase of a Missouri car accident case, shows you what drives the pace, and flags the Missouri deadlines that can quietly end your claim before it starts.

The Missouri car accident timeline at a glance

| Phase | Typical length | |---|---| | Medical treatment and investigation | 1–6 months | | Demand letter and negotiation | 1–3 months | | Filing the lawsuit and serving the defendant | 1–2 months | | Discovery | 3–9 months | | Mediation and settlement talks | 1–2 months | | Pre-trial motions and trial prep | 1–3 months | | Trial | 3–7 days | | Post-trial motions, appeal, collection | 2 months–2 years |

Add those up and you see the pattern. Settle after treatment and you may finish in 4 to 9 months. File suit and you should plan on a year or more. Try the case and appeal can stretch the fight past three years.

Phase 1: Heal first, and investigate while you do (1–6 months)

Your case starts with your body, not the courthouse. Doctors must either finish treating you or declare that you have reached maximum medical improvement — the point where your condition will not get meaningfully better with more treatment. Only then can anyone put an honest number on your claim.

Why wait? Because a settlement is final. Sign a release at month two and learn at month eight that you need surgery, and you pay for that surgery yourself. A strained back may stabilize in weeks. A brain injury or a spinal fusion can take a year.

While you heal, your lawyer builds the file:

Pulls the police report and your medical records and bills
Photographs the scene and the vehicles before evidence vanishes
Interviews witnesses while memories are fresh
Documents your lost wages and out-of-pocket costs
Identifies every insurance policy that might pay — including your own underinsured motorist coverage

Rushing this phase is the most expensive mistake you can make. Skip it, and you negotiate blind.

Phase 2: The demand letter and the insurer's answer (1–3 months)

Once your treatment stabilizes, your lawyer sends the at-fault driver's insurer a demand letter. It lays out what happened, what you lost, and the dollar figure that would settle the claim.

The insurer reviews it and almost always answers with a lower number. Then the real negotiation begins. Expect one to three months of offers and counteroffers. Three endings are possible:

A fair offer. You accept, sign a release, and the case closes — often within 4 to 9 months of the crash.
A lowball offer. The insurer bets you will take less out of fatigue or financial pressure. Your lawyer counters or files suit.
A denial. The insurer blames you or disputes your injuries. A lawsuit becomes the only path forward.

Filing suit is not a failure. It is leverage. Insurers track which lawyers actually try cases, and they raise their offers when the alternative is a jury.

Phase 3: Filing suit — and the deadlines that decide whether you can (1–2 months)

A Missouri car accident lawsuit begins when your lawyer files a petition in circuit court. A process server then delivers the petition and summons to the defendant, who generally has 30 days to answer.

Three Missouri deadlines control this phase, and two of them are traps:

The five-year rule. Under RSMo 516.120, you have five years from the crash to file a personal injury lawsuit. Five years sounds generous. Treat it as a backstop, not a plan. Witnesses move, footage gets deleted, and insurers read delay as weakness.

The shorter wrongful-death rule. If the crash killed someone, RSMo 537.100 gives the family three years, not five. The same statute adds a service trap: file near the deadline, and you must serve the defendant within 180 days of filing or the court dismisses the case.

The tolling exceptions. Under RSMo 516.170, the clock pauses for people who were under 21 or mentally incapacitated when the claim arose. A child injured at 10 does not face the same deadline as an adult.

The 90-day city trap. Hit a pothole, a missing stop sign, or a dangerous public street in a Missouri city of 100,000 or more? RSMo 82.210 requires written notice to the mayor within 90 days of the injury. Miss it and your claim against the city dies — years before the five-year statute would have mattered. Courts apply this statute seriously: in Williams v. City of Kansas City, 782 S.W.2d 64 (Mo. banc 1990), it reached even the steps between an airport terminal and its parking lot.

From the decision to sue through the defendant's answer, this phase usually runs one to two months.

Phase 4: Discovery, where cases earn their value (3–9 months)

Discovery is the longest stretch of most lawsuits. Both sides must show their cards. Missouri's civil rules supply the tools:

Interrogatories — written questions each side answers under oath
Requests for production — demands for records: medical files, wage statements, insurance policies, phone records, photos
Depositions — sworn, out-of-court testimony recorded by a court reporter; the defense will take yours
Independent medical examination — an exam by a doctor the defense picks, usually aimed at shrinking your injuries
Expert disclosures — accident reconstructionists, treating physicians, economists, each on the court's scheduling order

Simple cases finish discovery in three or four months. Multi-defendant crashes — chain reactions, commercial trucks, rideshares — can push it past nine. Your deposition matters most here. The defense lawyer is measuring how a jury will receive you, and the insurer adjusts its money accordingly. For a deeper look at the process, read What Is Discovery in a Missouri Lawsuit?.

Phase 5: Mediation, where most lawsuits end (1–2 months)

After discovery, both sides finally know the case. Most Missouri courts push the parties toward mediation: a half-day or full-day session where a neutral mediator shuttles between rooms and tests each side's bottom line.

Mediation is voluntary and non-binding — but it works. It resolves the majority of litigated car accident cases, because it forces the insurer and the injured person to price the same risk on the same day. What moves the number:

How clearly the evidence pins fault on the defendant
How severe and well-documented your injuries are
Whether your treatment records show consistent care or suspicious gaps
How much insurance money is actually available
What trial would cost each side in time and fees

Budget one to two months for scheduling, the session itself, and any follow-up negotiation. To see where those numbers come from, read How Personal Injury Settlements Are Calculated in Missouri.

Phase 6: Pre-trial motions and trial prep (1–3 months)

If mediation fails, the case turns toward trial. Either side may ask the judge to end the case early with a summary judgment motion, arguing the evidence permits only one outcome. Judges rarely grant these in fault-disputed crash cases, but ruling on them takes weeks or months.

Meanwhile your lawyer prepares witness lists, exhibits, jury instructions, and the opening statement. The court's docket drives this phase: a busy urban circuit schedules trials farther out than a rural one.

Phase 7: Trial itself is the shortest phase (3–7 days)

A Missouri car accident trial typically lasts three to seven days: jury selection, opening statements, witnesses for each side, closing arguments, deliberation, verdict.

One feature of Missouri law shapes everything the jury hears. Missouri follows pure comparative fault: the jury assigns each party a percentage of fault, and your award shrinks by your share. Found 20 percent at fault on a $100,000 verdict, you collect $80,000 — but even 90 percent at fault does not bar recovery entirely. Missouri adopted this doctrine through its courts (Gustafson v. Benda, 661 S.W.2d 11 (Mo. banc 1983)) and codified it for product cases in RSMo 537.765.

Comparative fault is also why disputed cases run long. When the insurer can argue you share blame, it has less reason to pay full value early and more reason to make you prove the split to a jury.

The clock keeps running after the verdict

Winning at trial is not the finish line. The defense can file post-trial motions, which the judge may take months to decide. It can then appeal, and a Missouri appeal commonly adds a year or more. Only after the judgment becomes final — and the insurer cuts the check or you begin collection — is the case truly over.

This is the hidden math behind settlement. A certain number today often beats a larger number two years from now. Sometimes it does not. Your lawyer should walk you through that trade-off honestly, case by case.

Two claims run on different clocks: the other driver's insurer and yours

If the at-fault driver carried no insurance or too little, your own uninsured/underinsured motorist (UM/UIM) coverage becomes the target. That is a first-party claim against your own policy, and it runs on its own track — sometimes a parallel lawsuit, sometimes arbitration under the policy's terms. It can settle early or outlast the claim against the other driver. Raise it with your lawyer on day one, because notice requirements in your policy can be far shorter than five years.

What speeds your case up — and what drags it out

You control more of the pace than you think.

Faster:

Hire a lawyer early, while evidence still exists
Follow your treatment plan with no gaps the defense can exploit
Answer your lawyer's requests for records and decisions quickly
Give the insurer a fair chance to settle before suit

Slower:

Disputed fault, which adds investigation, experts, and jury risk
Severe injuries, which rightly delay settlement until your prognosis is clear
Multiple defendants, each with its own lawyer and calendar
Insurer delay tactics — slow responses, continuances, motions — designed to wear you down
Congested urban dockets, where trial dates land farther out

Frequently asked questions

How long do I have to file a car accident lawsuit in Missouri?

Five years from the crash for injury claims under RSMo 516.120, and three years for wrongful death under RSMo 537.100. Claims involving a defective city street need written notice to the mayor within 90 days under RSMo 82.210. Minors and incapacitated people get extra time under RSMo 516.170.

Can I do anything to speed my case up?

Yes: treat consistently, respond to your lawyer promptly, and stay realistic in negotiation. You cannot control the court's calendar or the insurer's tactics.

Should I take the insurance company's first offer?

Almost never without legal advice. First offers usually price your case before anyone knows its full value — and the release you sign is permanent.

Will my case go to trial?

Probably not. The large majority of car accident claims settle. But insurers pay more to people whose lawyers are ready and able to try the case, so trial readiness is part of what shortens your wait.

What if I was partly at fault?

Missouri's pure comparative fault rule reduces your recovery by your percentage of fault but does not erase it. A fault fight adds time, so expect a longer road when blame is contested.

Next steps: your timeline starts the day of the crash

Evidence fades fast, and two of Missouri's deadlines — 90 days for city street defects, three years for wrongful death — punish waiting far sooner than the five-year rule suggests. The earlier a lawyer protects your claim, the more of the timeline you control.

Hurt in a Missouri car accident? Contact Ott Law Firm or call (314) 710-2740 for a free consultation. We will tell you honestly what your timeline looks like.

This article is for informational purposes only and does not constitute legal advice. Deadlines and outcomes depend on the facts of your case. Talk to a licensed Missouri attorney about your situation.

How Long Does a Car Accident Lawsuit Take in Missouri?