From The NWS Medford:
Very cold temperatures are expected tonight into New Year’s morning with lows in the 20s to lower 30s west of the Cascades and into the single digits to teens on the East Side. A freeze warning is in effect for coastal areas in Coos and Douglas counties as well.
For areas west of the Cascades, These cold temperatures could damage sensitive plants if left outdoors or unprotected. Exposed pipes could freeze. Also icy spots may develop on roads especially over bridges and overpasses and in areas where snow melt occurs on roads then refreezes at night. As far as people and pets are concerned, hypothermia can set in quickly in the cold temperatures. It is best to bring pets inside if possible. Remember, if it is too cold for you, it is too cold for them. In addition, with cold temperatures in the mornings, do not leave cars to warm-up unattended.
More information about cold safety can be found on http://www.ready.gov/winter-weather.