Indiana Studded Tires: Legal October 1 to May 1, 3/32 Inch Projection Cap

Indiana does not write studded tires as a permission with a season attached. It writes a flat ban and then carves the season out of it. Ind. Code § 9-19-18-3(a) says a tire on a vehicle moved on a highway may not carry on its periphery a block, stud, flange, cleat or spike, or any other protuberance of a material other than rubber that projects beyond the tread of the traction surface. Subsections (b) through (e) are the only escapes. That framing matters for a driver stopped in June: an out of season studded tire is not a disfavoured choice, it is a tire bearing an unlawful protuberance under subsection (a).

The seasonal exception is subsection (d), and it attaches four conditions to every stud. The stud must be of wear-resisting material. It must be installed in a manner that provides resiliency upon contact with the road. Its projection may not exceed three thirty-seconds (3/32) of an inch beyond the tread of the traction surface of the tire. And it must be constructed to prevent any appreciable damage to the road surface. Notice what Indiana does not regulate: the statute sets no maximum number of studs per tire, no limit on how many wheels may be studded, no separate rule for front versus rear axles, no reduced speed limit for a studded vehicle, and no registration, permit or notice to the Bureau of Motor Vehicles. The 3/32 inch figure is the only number in the section.

Retractable studs were added by P.L.35-2008, SEC.2, and they get their own treatment. Ind. Code § 9-13-2-154.8 defines retractable tire studs, for purposes of IC 9-19-18, as studs that are capable of being retracted and that otherwise satisfy the requirements of § 9-19-18-3(d). Subsection (e) then says that notwithstanding subsection (d), a vehicle may be equipped year-round with tires that have retractable tire studs if the studs remain retracted from May 2 to September 30 of each year. The two date ranges dovetail exactly: deployment is lawful October 1 through May 1, and the mandatory retracted period picks up the very next day and runs to the day before the season reopens. A retractable set therefore never has to come off the vehicle.

Chains are governed separately and much more loosely. Under subsection (c), tire chains of reasonable proportions may be used upon a vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid. There is no October to May window on chains, no size table and no highway class restriction; the trigger is the road condition, not the calendar. Subsection (b) allows implements of agriculture to use tires with protuberances that will not injure the highway, and Ind. Code § 9-19-18-4 lets the Indiana Department of Transportation and local authorities issue special permits for traction engines, tractors with movable tracks carrying transverse corrugations, and farm tractors or implements of agriculture designed to work primarily in a field or on farm premises.

Two neighbouring sections complete the picture. Ind. Code § 9-19-18-2 bans metal tires outright: no one may operate or move on a highway a motor vehicle, trailer or semitrailer having a metal tire in contact with the roadway, and Ind. Code § 9-13-2-102 defines a metal tire as one whose highway-contacting surface is wholly or partly of metal or other hard nonresilient material. Ind. Code § 9-19-18-1 requires a solid rubber tire to keep at least one inch of rubber above the flange across its whole traction surface. So the chapter reaches winter hardware from both directions: studs are allowed only within the season and the 3/32 inch limit, and anything that turns the contact patch itself into metal is barred year round.

Finally, the chapter does not reach everyone. Ind. Code § 9-19-18-5(a) disapplies the section to a person who owns or operates a vehicle or combination of vehicles that contains parts and accessories and is equipped as required under United States Department of Transportation regulations, which lifts federally regulated commercial equipment out of the state rule. More broadly, Ind. Code § 9-19-1-1(a) puts the entire vehicle equipment article out of reach for implements of agriculture designed to operate primarily in a farm field, road machinery, road rollers, farm tractors, and golf carts and off-road vehicles operated in accordance with a local ordinance adopted under IC 9-21-1-3(a)(14) or IC 9-21-1-3.3(a).

Ind. Code § 9-19-18-5(b) makes a violation of the tires chapter a Class C infraction, and Ind. Code § 34-28-5-4(c) caps the judgment for a Class C infraction at five hundred dollars ($500), on top of court costs. An infraction in Indiana is a civil proceeding, not a criminal charge, so there is no arrest and no jail exposure for the equipment offence itself; the state files a complaint, the driver may admit it, plead nolo contendere or contest it, and the court enters a money judgment.

Enforcement is by roadside citation from a law enforcement officer who sees the studs, which is why the practical question in April and early May is the calendar rather than the hardware. Where the same stop turns up a metal tire in contact with the roadway under § 9-19-18-2 or a solid rubber tire worn past the one inch minimum under § 9-19-18-1, each is a separate violation of the same chapter and carries the same Class C classification.