The short answer

A mud-terrain tread is engineered to clear mud, not to compact snow. Those are close to opposite jobs. Mud performance comes from large blocks and wide voids that fling material out; snow traction comes from fine siping and a tread that packs snow against snow, because snow grips itself far better than rubber grips it.

That is why almost no mud-terrain carries the three-peak mountain snowflake symbol — and why none of the tires in our comparisons does.

What 3PMSF actually certifies

The three-peak mountain snowflake was established in 1999 by the U.S. Tire Manufacturers Association and the Rubber Association of Canada. To earn it, a tire must pass an ASTM traction test on packed snow and reach a traction index of at least 110 against a 14-inch reference tire, or 112 against a 16-inch reference, where the reference tire itself scores 100.

Here is the part almost nobody mentions: that test measures acceleration traction on medium-packed snow only. Braking on snow is not assessed. Cornering is not assessed. Ice is not assessed at all.

A 3PMSF tire is therefore certified to get moving in snow better than one without it. It is not certified to stop or turn any better.

M+S is not a winter rating

Most mud-terrains carry an M+S stamp, and a great many buyers read that as winter capability. It is not. M+S is awarded on tread pattern geometry — essentially the ratio of void to contact area — and makes no guarantee of any performance capability. A tire can carry M+S and have been tested on snow exactly never.

If you take one thing from this page: M+S describes a shape. 3PMSF describes a measured result.

Where that leaves the tires we’ve compared

None of the mud-terrains in our current comparison set carries 3PMSF certification. Where a manufacturer publishes nothing about snow, we record that as a gap rather than inferring capability from how the tread looks.

“Not stated” means the manufacturer publishes no claim either way — not that the tire failed a test.

What to do if you actually see winter

If you live somewhere with sustained snow and ice, the honest answer is that a mud-terrain is the wrong tool, and no amount of tread aggression changes the certification. Two things work: a dedicated winter tire on a second set of wheels, or an all-terrain carrying 3PMSF, which a growing number now do.

Some jurisdictions and insurers treat 3PMSF as the standard for winter compliance, so the marking can matter legally as well as practically. Check your local requirement rather than assuming aggressive tread qualifies.

The gap in the evidence

We could not find independent, published braking or cornering data on snow for any of these tires. That is a genuine hole in the public record, and it is why this page explains what the certifications mean rather than ranking these tires against each other for winter use. We would rather tell you we don’t know than invent a ranking.