Studded tires use small metal studs — typically tungsten carbide — embedded in the tread. The studs bite into ice and packed snow in ways rubber can't. On glare ice, studded tires can cut braking distance by half versus a non-studded winter tire. But the same studs damage pavement, and most states regulate or prohibit their use.
Where studded tires are legal year-round
Alaska, some parts of Canada, and a handful of rural mountain regions allow studs year-round.
Where they're seasonally legal
Most states with significant winter conditions allow studs between roughly October/November and March/April:
- Northern New England (NH, VT, ME) — Oct 1 to May 1 or similar
- Most mountain states (CO, ID, MT, WY, UT) — Oct 15 to April 30 or similar
- Pacific Northwest (WA, OR) — November to March
- Upper Midwest (MN, ND, SD) — generally allowed seasonally
- Northeast (NY, MI, PA) — varies by county, but generally seasonal
Exact dates vary by state. Check your state's DOT website before buying — fines can be steep.
Where they're banned
Most southern and central states ban studded tires entirely or year-round, including most of the Plains states and the Southwest. The reason is pavement wear — studs gouge millions of dollars of pavement per year in studded states.
How studs work
Studs are small carbide-tipped metal pins set into the rubber tread. On ice, they protrude slightly and bite into the surface for grip. On dry pavement, they retract slightly under load and clatter against the road — that distinctive metallic sound you hear from studded cars.
Studded vs studless winter tires
Modern studless winter tires (Blizzaks, Hakkapeliittas, Continental VikingContacts) close most of the gap to studded tires for snow grip and ride comfort. The remaining gap is mostly on glare ice — where studs are still significantly better — and on glare ice, nothing beats them.
For most drivers, studless winter tires are the better tradeoff: better dry-pavement handling, quieter, and no legal-date restrictions.
Driving studded tires correctly
- Break them in gently for the first 100 miles to seat the studs
- Don't drive aggressively on bare pavement — you'll knock studs loose
- Studded tires are louder and slightly less efficient on dry roads
- Have them removed before the legal date — fines are state-by-state
Studded tires solve one problem — glare ice — extremely well, and create several others.