Vessels that have a valid number under federal law in the state of principal use, may temporarily use Washington waters without obtaining Washington registration for 60 days in any twelve month period.
Registration must be completed before you operate your vessel. The state registration year is July 1 through June 30. When you register you may request the continued use of your Coast Guard registration number.
. Click here for more information and application
. Tax, Title and Registration of Boats - Washington State / Canadian Boats