What tires do I need for Little Cottonwood Canyon?

When the traction beacons are flashing: at least 5/32 inch tread, plus M+S tires on all wheels for AWD or 4WD, or 3PMSF tires on all wheels for 2WD, or approved chains or devices. Check UDOT for current status.

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Cottonwood Canyons traction rules

UDOT's traction law is Utah administrative rule R920-6. UDOT can put requirements in place 24 hours before a storm begins. (source: Utah Department of Transportation)

When the beacons outside Big or Little Cottonwood Canyon are flashing, vehicles must have at least 5/32 inch tread depth, and: (source: Utah Department of Transportation)

AWD or 4WD: M+S tires on all wheels at minimum. Chains, snow socks or 3 peak mountain snowflake (3PMSF) tires on all wheels are also acceptable.
2WD: 3PMSF tires on all wheels at minimum. Chains or other traction devices on at least two drive wheels are also acceptable.

(source: Utah Department of Transportation)

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Sources

Utah Department of Transportation: Traction Law, Cottonwood Canyons (checked October 30, 2026)

Last updated: October 30, 2026