California road conditions & weather — the routes we actually cover.

From the Sacramento Valley to the Sierra crest and into Nevada, a single trip can cross very different weather. Check the summit forecast at your estimated arrival, then confirm current restrictions on the California and Nevada sides.

Also crosses: Nevada

This northern I-5 crossing connects warmer valley sections with mountain terrain near Mount Shasta and Siskiyou Summit. Check both Caltrans and Oregon TripCheck because the state line is also a data boundary.

Also crosses: Oregon

Leave the Los Angeles basin, climb through the Inland Empire and cross the Mojave before the Las Vegas valley. Heat, wind and mountain weather can differ sharply from the endpoint forecasts, so use the desert checkpoints and then confirm current restrictions in both states.

Also crosses: Nevada

I-10 crosses the Southern California desert and enters Arizona before reaching Phoenix. Temperature, wind and dust can change across the long open sections, and the state-line clock needs to be read in the correct local zone.

Also crosses: Arizona

This coastal Southern California drive can move from marine-layer cloud and fog into warmer inland conditions while urban traffic changes the real arrival time. Use the checkpoint weather for timing, then confirm current road restrictions with Caltrans.

The long I-5 run from Sacramento to Los Angeles crosses the Central Valley before climbing Tejon Pass. Heat, wind and pass weather can be very different from the two endpoint cities, so the intermediate checkpoints matter.