The big opener for trout season is coming up in just a few weeks. April 26th marks the opener for most lakes in Whatcom and Skagit county. A large number of lakes are stocked with heavy numbers of trout, and other opportunities are available for bass fishing and more.
WDFW has released a list of stocked lakes, showing the number of trout going into each. http://wdfw.wa.gov/fishing/plants/statewide/.
And be sure to read up on the regs before heading out. http://wdfw.wa.gov/fishing/regulations/ and pick up a license at a local vendor or online.