The Washington State Legislature meets every year in regular session, beginning on the second Monday in January.  In odd-numbered years, a regular session lasts up to 105 consecutive days; in even-numbered years, up to 60 consecutive days.

The Legislature may also meet in special legislative session for up to 30 consecutive days.  Special legislative sessions may be called by the Governor, via proclamation, or, while the Legislature is in session or during any legislative interim, by the vote of two-thirds of each legislative chamber.  If a special legislative session is convened via gubernatorial proclamation, the proclamation must state the purpose or purposes of the session, but those purposes are not binding upon the Legislature. 

If the Legislature convenes a special legislative session by resolution, the resolution must specify the purpose or purposes for the special legislative session, and the Legislature may only consider matters germane to the purpose or purposes stated in that resolution without the consent of two-thirds of each chamber.  The Legislature may adopt procedures for calling a special legislative session by law or resolution. 

Procedures are set in statute for the Legislature to convene a special session. 

A proposed resolution setting the date, time, and purposes for convening the session may be introduced in either the House of Representatives or the Senate, and must be referred to that chamber's Rules Committee.  Upon approval by a majority of the Rules Committee, the resolution advances to the full chamber.  A resolution must be approved by a two-thirds supermajority vote of one chamber to pass to the other chamber. 

If both chambers pass the resolution with a two-thirds supermajority vote in accordance with these procedures, a special legislative session will be called in accordance with the terms of the resolution.