if you have access to a computer when you hit the airport. (or check from home before you leave, but the info won't be as fresh)
check out.
http://www.tripcheck.com/ it'll let you know road conditions.
some important things to keep in mind once you leave I-5.
1. log trucks and chip trucks are heavy, fast(most are paid by the load not the hour), and you are hard to see. they will not get out of your way. they will run you over.
2. if you drive slower than other cars use the turn-outs and let people pass. you will be ticketed if cars are lined up behind you and you pass a turn-out without using it.
3. in the passes ice can show up at almost any time. often 'black-ice' which you can't tell from a wet road. watch for the mile markers with reflectors and reflectors on the pavement, the reflectors turn blue when the temp dips below freezing.
4. the mountain roads twist and turn a lot, and are kind of intimidating to people from the flat lands (not sure where you are from). don't worry, the corners are banked for speed, keep the pedal down.
5. if you smoke DO NOT FLICK BUTTS OUT OF THE WINDOW. fire is a big deal hear, and even though it's not the season, and you likely couldn't start one if you wanted to, the punishment is just short of a lynching.