Even if you have a trust, you still need to have a will.
Trust May not Cover all Property
A trust will only take care of property that is titled or kept in the trust. To be effective, a trust should be accompanied by something called a pour-over will to put any property that may have been forgotten into the trust upon your death.
Trust Can be More Expensive than Probate
Also, using a trust just because you want to avoid probate may not make sense legally or economically. Probate in Washington is generally not a difficult, lengthy, or costly process. In some cases, the cost of preparing a trust can be 10 times the cost of preparing a simple will, and in some cases the cost of a trust may exceed the cost of an entire probate.
Before deciding to use a trust for estate planning purposes, you should consult an attorney to see if it accomplishes your goals, both legally and economically.