From NOAA:
Skies will clear during the second half of the weekend. Overnight temperatures will likely drop into the upper 20s to mid 30s across much of the region. This will likely result in widespread frost Saturday and Sunday nights across much of northwest Oregon and southwest Washington.
Now is a good time to pick your remaining vegetables and to cover
other frost sensitive plants. It is also a good time to winterize
your outdoor pipes and hoses for the upcoming winter.