Coverage before claims

Winter roads by state

A state page tells you exactly what is live here, what is missing, and where the official answer lives.

California

Caltrans CWWP2 chain-control points statewide, polled every 10 minutes.

A clear R-0 point is not a guarantee that every road segment is clear. Check the linked Caltrans route report before departure.

WSDOT Mountain Pass Conditions, including directional restrictions and agency update times.

Coverage is limited to passes WSDOT reports through the Mountain Pass API.

Current Oregon conditions are available on TripCheck.

Current Oregon restrictions are unavailable here. Check TripCheck before departure.

Current Utah conditions are available on UDOT Traffic.

Check UDOT for current canyon traction restrictions and closures.

Current Nevada conditions are available on Nevada 511.

Nevada restrictions are unavailable here. Check Nevada 511 for current chain or snow-tire controls and closures.

Idaho 511 road-condition segments, mountain-pass locations and commercial restrictions, polled every 10 minutes.

Idaho 511 may pause pass reporting outside winter operations. A 'No report' reading is shown as unknown, never as an all-clear.

COtrip road-condition segments polled every 10 minutes, with contextual CDOT snow-plow positions stored hourly.

The normalizer surfaces Code 15/16 text when COtrip publishes it; always confirm on COtrip before travel.

Current Montana conditions are available on Montana 511.

Current Montana restrictions are unavailable here. Check Montana 511 before departure.

Current Wyoming conditions are available on WyoRoad.

Check WyoRoad for current Level 1/2 restrictions and closures.

Current Arizona conditions are available on AZ511.

Arizona generally manages severe winter travel through closures and restrictions rather than a passenger chain-control program.