Winter and snow/ice accident claims in Missouri

Missouri isn't Colorado or Minnesota, but its winters still put a real dent in the state's roads. In 2023, Missouri saw more than 3,800 crashes during snow, sleet, hail, or ice, with 1,198 injuries and 22 deaths, according to preliminary Missouri State Highway Patrol data.¹ Nationally, the Federal Highway Administration estimates over 1,300 deaths and more than 116,800 injuries every year in crashes on snowy, slushy, or icy pavement, with close to 900 of those deaths happening while snow or sleet is actively falling.²

The legal basics of a snow or ice crash, who's usually at fault, what insurance covers, work the same in Missouri as anywhere else. What's different is the state's specific fault rule, its rules for suing over an untreated road, a deadline that's much shorter than most people assume, and a few Missouri-only statutes worth knowing before the next storm.

Comparative fault does not forgive an icy road

Missouri is a pure comparative fault state. Under Gustafson v. Benda, the Missouri Supreme Court did away with the old rule that any fault by the injured person barred recovery entirely, and replaced it with a rule that a plaintiff's own fault only reduces the damages award proportionally.³ Even a driver found 80 percent at fault for a winter crash can still collect the remaining 20 percent from the other driver.

That doesn't mean weather is a free defense for the other 80 percent, though. Section 304.012 requires every Missouri driver to operate "in a careful and prudent manner" and to "exercise the highest degree of care," a standard that doesn't loosen because the pavement is slick.⁴ Adjusters and defense attorneys sometimes lean on the idea that black ice made a crash unavoidable. Section 304.012 is the answer to that argument: drivers are expected to slow down and increase following distance as conditions get worse, and failing to do so is itself a violation, ice or no ice.

When the real defendant is the state or a city

Plenty of winter wrecks trace back to a road that wasn't plowed or salted in time, rather than to any mistake by the other driver. Suing a government entity in Missouri starts from sovereign immunity, but Section 537.600 waives that immunity for a "dangerous condition" of public property, so long as the condition created a reasonably foreseeable risk of harm and the injury directly resulted from it.⁵ An ice patch MoDOT or a city knew about and left untreated, or a plow ridge that froze into a wheel-catching rut, can fit that description.

MoDOT's own snow and ice policy works on a tiered schedule: interstates and routes carrying at least 2,500 vehicles a day are "Priority 1" and get round-the-clock plowing and salting through a storm, while lower-volume state routes are only cleared to two-way passable and treated at hills, curves, and intersections.⁶ That tiering matters in a claim, since a plaintiff generally has to show the response was unreasonable for the category of road involved rather than simply that ice was still present when the crash happened.

The 90-day trap that catches people who wait

Ordinary injury and property damage claims in Missouri run on a five-year clock under Section 516.120(4).⁷ That number stops applying the moment the defendant is a city and the claim involves a defect in a street, bridge, or thoroughfare, which describes a lot of ice-related road claims. Section 82.210 requires written notice to the mayor within 90 days of the injury for any city with a population of 100,000 or more, a list that includes Kansas City, St. Louis, Springfield, and Columbia.⁸ Miss that window and a claim against the city is generally barred, even with years left on the standard statute of limitations. If a pothole, a plow ridge, or an unsalted patch on a city street contributed to the crash, get notice to the mayor's office filed early rather than assuming the five-year deadline controls.

Pileups, uninsured drivers, and your own policy

Whiteout conditions and black ice are behind Missouri's periodic multi-vehicle pileups on stretches of I-70 and I-44. Fault in a chain-reaction crash still gets apportioned driver by driver under the same comparative fault rule, but the harder practical problem is collectability: the driver who triggered a ten-car pileup may not carry enough coverage to pay for it. Missouri requires uninsured motorist coverage at 25/50 limits on every standard auto policy, with no waiver option, which matters because the state's minimum liability limits, also 25/50/25, run out fast once more than two or three vehicles are involved.⁹ Checking your own UM coverage before the first snowfall, not after a pileup, is the one piece of housekeeping that changes how a bad multi-car claim actually plays out.

The snowplow move-over law

Missouri's move-over law started out covering police and emergency vehicles, but it now also covers MoDOT trucks and other highway workers running amber or amber-and-white lights, including active snowplows.¹⁰ On a road with two or more lanes in the same direction, a driver has to move over into a lane away from a stopped or slow-moving plow if it's safe to do so. If changing lanes isn't safe or possible, the driver has to slow down and proceed with caution instead. A violation can mean fines and jail time, and it also hands a plaintiff's attorney a negligence-per-se argument if a driver clips or rear-ends a plow, or gets hit while tailgating one.

Studded tires and snow on the roof

Studded tires are legal in Missouri, but only between November 1 and April 1 under Section 307.171; running them the rest of the year is an infraction.¹¹ Missouri, unlike a few of its neighbors, has no statute specifically requiring drivers to clear snow or ice off a windshield or roof before pulling onto the road. Skipping that step still carries risk: if a sheet of ice or snow comes off a moving vehicle's roof and causes a crash, Section 304.012's careful-and-prudent standard still covers it. MoDOT's own advice tracks the same logic: clear every window, including the back and side glass, and stay back at least 100 feet from an active plow rather than passing it.¹²

What the crash report already proves

Missouri's official crash report form, the Uniform Crash Report used across the STARS system, has dedicated fields for Roadway Surface and Weather/Environmental Condition, and officers routinely mark those as snow or ice at the scene.¹³ That single entry ends up doing double duty in a winter case: it feeds the comparative fault fight over how fast someone should have been driving, and it's often the first evidence a plaintiff points to in a dangerous condition claim against MoDOT or a city. Our Missouri crash report guide covers how to request the report itself.

Quick numbers to keep straight

• Statute of limitations: 5 years for injury or property damage claims (Section 516.120(4)), but only 90 days' written notice to the mayor if the defendant is a city of 100,000 or more people and the claim involves a street, bridge, or sidewalk defect (Section 82.210).
• Minimum liability limits: 25/50/25 (Section 303.190). Uninsured motorist coverage is mandatory at 25/50 limits (Section 379.203).
• Crash reports document the weather and road-surface conditions officers observed at the scene, and that data can support either side of a fault fight.

If a winter crash left a vehicle with damage worth fighting over, our Missouri diminished value guide covers how to value that loss on top of the repair bill. And if a claim runs into a sovereign immunity fight, a 90-day notice deadline, or a multi-car pileup with contested fault, that's exactly the kind of case where a lawyer earns their fee. Our legal directory lists Missouri attorneys who handle these claims.

This article is general information, not legal advice.

Sources

1. Missouri Department of Public Safety / State Emergency Management Agency, citing Missouri State Highway Patrol preliminary 2023 winter weather crash data: https://sema.dps.mo.gov/news/newsitem/uuid/aa27d38c-992e-4799-b589-8e676219f88c

2. Federal Highway Administration, Road Weather Management, "Snow & Ice": https://ops.fhwa.dot.gov/weather/weather_events/snow_ice.htm

3. Gustafson v. Benda, 661 S.W.2d 11 (Mo. banc 1983): https://www.courtlistener.com/opinion/1787880/gustafson-v-benda/

4. Mo. Rev. Stat. Section 304.012: https://revisor.mo.gov/main/OneSection.aspx?section=304.012

5. Mo. Rev. Stat. Section 537.600: https://revisor.mo.gov/main/OneSection.aspx?section=537.600

6. Missouri Department of Transportation, Engineering Policy Guide, "133.4 Snow and Ice Control Operations": https://epg.modot.org/index.php/133.4_Snow_and_Ice_Control_Operations

7. Mo. Rev. Stat. Section 516.120(4): https://revisor.mo.gov/main/OneSection.aspx?section=516.120

8. Mo. Rev. Stat. Section 82.210: https://revisor.mo.gov/main/OneSection.aspx?section=82.210

9. Mo. Rev. Stat. Sections 379.203 and 303.190: https://revisor.mo.gov/main/OneSection.aspx?section=379.203

10. Mo. Rev. Stat. Section 304.022; Missouri Department of Transportation, "Missouri's Move Over Law": https://www.modot.org/missouris-move-over-law

11. Mo. Rev. Stat. Section 307.171: https://revisor.mo.gov/main/OneSection.aspx?section=307.171

12. Missouri Department of Transportation, "Winter in St. Louis": https://www.modot.org/winter-st-louis

13. Missouri State Highway Patrol, Missouri Uniform Crash Report Preparation Manual (rev. Jan. 1, 2026): https://apps.mshp.dps.mo.gov/MSHPWeb/PatrolDivisions/PRD/documents/MUCRManual_01_01_26v7_2.pdf