Wash. Admin. Code § 468-250-030
(1) Because of surface conditions and/or snow cover, the following state airports will be closed to all traffic (except in an emergency) from approximately October 1 to June 1 of each year, by NOTAM.
(2) The following state airports may be closed during the winter due to conditions, by NOTAM.
[Statutory Authority: Chapter 47.68 RCW. WSR 96-17-018 (Order 164), recodified as § 468-250-030, filed 8/13/96, effective 9/13/96. Statutory Authority: RCW 47.68.100 and 47.68.210. WSR 83-11-041 (Order 80), § 12-40-030, filed 5/18/83.]