Pennsylvania Studded Tires: Legal November 1 Through April 15

The governing provision is 75 Pa.C.S. § 4525(c), captioned "Ice grips and tire studs." It permits tires fitted with ice grips or tire studs of wear resisting material "between November 1 of each year and April 15 of the following year," and it attaches two conditions to the studs themselves. They must provide resiliency upon contact with the road, and their projections may not exceed two thirty-seconds of an inch beyond the tread of the traction surface of the tire. Use outside that window is not a matter of officer discretion: the subsection ends by declaring that use of studded tires contrary to it "shall be unlawful."

Pennsylvania built one escape valve into that calendar, and it is narrow. Section 4525(c) allows the Governor to extend the studded-tire period by executive order when highway conditions are such that studded tires "would be a safety factor in traveling Commonwealth highways." No other office can move the date. PennDOT cannot push April 15 back by announcement, a county emergency declaration does not do it, and a heavy mid-April storm does not extend the season by itself. Absent a published executive order, April 16 is the first day a set of studs is illegal.

The penalty structure in § 4525(e) is unusual because it prices the offense by how far past the season the driver is. A violation of subsection (c) is a summary offense, and § 4525(e)(2) sets the fine from a chart keyed to the period of unauthorized use: April 16 to May 31 is $35, June 1 to June 30 is $45, and each of the four months from July 1 through October 31 is $55. Paragraph (e)(3) then handles the other way of breaking the rule. A violation of subsection (c) that occurs inside the lawful window, which in practice means studs projecting more than 2/32 inch, carries a fine of $10. Under § 4525(e)(1), a driver who does not pay may be sentenced to imprisonment for not more than 30 days.

Pennsylvania is one of the states that still runs a mandatory annual safety inspection, so the stud rule is enforced twice over. Section 4702(a) of the Vehicle Code directs PennDOT to maintain a system of annual safety inspection of vehicles, and PennDOT's regulation for passenger cars and light trucks, 67 Pa. Code § 175.65(f), tells the certified inspection mechanic that a tire "may not be equipped with ice grips or tire studs or wear-resisting material which have projections exceeding 2/32 inch beyond the tread of the traction surface of the tire." Parallel subsections repeat the same limit for medium and heavy trucks and buses at § 175.95(f), for trailers at § 175.124(f), for motorcycles at § 175.145(d), and for motor-driven cycles and motorized pedalcycles at § 175.174(e). Worn or over-projecting studs therefore fail the sticker inspection regardless of the month.

Two neighboring rules in the same regulation catch drivers who stud only one wheel or run a mismatched set. Section 175.65(d) provides that tires of different types, "such as one snow tire and one regular tire or bias, belted or radial tire, may not be used on the same axle except in an emergency," and § 175.65(c) separately bars a radial ply tire on the same axle as a bias or belted tire. A single studded snow tire paired with a summer tire on the front axle is an inspection rejection even in January.

Tire chains are governed separately by § 4525(d) and are not tied to the November-to-April calendar at all. Chains "may be temporarily used on vehicles during periods of snow and ice emergency" if they conform to PennDOT regulations, so the trigger for chains is the storm rather than the date. The current text of subsections (c) and (e) dates to Act 146 of 1984, which rewrote both the window and the fine chart.

A violation of 75 Pa.C.S. § 4525(c) is a summary offense charged by any police officer with authority on the highway, and Title 18's general summary-offense penalties do not apply because § 6502(c) excludes them from the Vehicle Code. The fine is read off the chart in § 4525(e)(2) according to when the studs were used: $35 for April 16 through May 31, $45 for June, and $55 for each month from July through October. A stud that exceeds the 2/32 inch projection limit during the lawful season draws $10 under § 4525(e)(3). Section 4525(e)(1) adds that a person who defaults on payment shall undergo imprisonment for not more than 30 days. Separately, a certified inspection mechanic must reject the vehicle at its annual safety inspection under 67 Pa. Code § 175.65(f) if the studs project beyond 2/32 inch, and under § 175.65(d) if one snow tire is paired with a regular tire on the same axle.