Studded tires are legal in New Hampshire year-round. The state is one of a small group that places no seasonal restriction on studs, requires no permit, and sets no window during which they must be removed. You can mount them in October and leave them on through July if you want to.
No Seasonal Window in the Statute
New Hampshire’s vehicle equipment statutes sit in RSA Title XXI, Chapter 266. They cover tread depth, lighting, and the rest of the equipment rules, but nothing in them bans or restricts studded tires during any part of the year. Most states that allow studs confine them to a defined winter season. New Hampshire does not.
Your Tires Still Have to Be Safe
Studs are unrestricted, but the tire underneath still has to meet the state’s general safety standards. RSA 266:48 requires any tire on a motor vehicle or trailer to meet both visual and tread depth requirements to be in safe operating condition. That rule applies to studded tires the same way it applies to all-seasons.
At a state safety inspection, inspectors look at tread depth, structural integrity, and fit. A studded tire that’s bald, shows exposed cords, or has a bulging sidewall fails inspection like any other tire. The studs themselves aren’t the issue; the casing is.
On the road, an officer who decides your tires are unsafe can write you up for an equipment violation regardless of whether they’re studded. New Hampshire’s uniform fine schedule sets equipment violations for cars and trucks at $62 for a first offense and $124 for a second.
Watch the State Line
The practical trap for New Hampshire drivers is crossing into a neighboring state. Vermont, Maine, and Massachusetts allow studs only during defined seasonal windows. If you drive into any of them with studs mounted outside those dates, legal at home doesn’t help you. Check the dates for the state you’re entering before you travel, especially in early fall or late spring when New Hampshire drivers are most likely to still have studs on.
Legal Doesn’t Mean a Good Idea Year-Round
The reason most states restrict studs is pavement damage. Metal studs cut into the road surface with every mile and create ruts in the wheel paths. A Washington State Department of Transportation study estimated studded tires cause $10 million to $16 million in annual damage to concrete pavements in that state, with ruts deepening at roughly 0.2 to 0.3 millimeters per year and repairs running about $175,000 per lane-mile.
New Hampshire pavement takes the same punishment. Leaving studs on through dry summer months adds wear without giving you any traction benefit, since studs do their work on ice. Swapping back to non-studded tires once winter ends isn’t required here, but it’s quieter, easier on your handling, and easier on the roads. The fact that you can legally run studs in July doesn’t mean you should.