Wash. Rev. Code § 11.103.050
(1) A person may commence a judicial proceeding to contest the validity of a trust that was revocable at the trustor's death within the earlier of:
(b) Four months after the trustee sent to the person by personal service, mail, or in an electronic transmission if there is a consent of the recipient to electronic transmission then in effect under the terms of RCW 11.96A.110, a notice including:
(2) Upon the death of the trustor of a trust that was revocable at the trustor's death, the trustee may proceed to distribute the trust property in accordance with the terms of the trust, unless:
[ 2013 c 272 s 20; 2011 c 327 s 38.]
Application—2013 c 272: See note following RCW 11.98.002.
Application—Effective date—2011 c 327: See notes following RCW 11.103.020.