Drop-in Visitors

Note: The LIGO Hanford Observatory will be closed to drop-in visitors on Thursday April 12th and Friday April 13th. The monthly tour will occur as scheduled on Saturday April 14th, 1:00 p.m.


If you cannot visit LIGO during one of our monthly public tours, you may drop Monday, Tuesday, Thursday, and Friday between 10:00 a.m. and 4:00 p.m. Wednesdays you may visit between 9 a.m. and 3 p.m. LIGO is closed to drop-in visitors weekends and holidays.

During an un-hosted visit, guests can view a number of posters, exhibits, and hardware displays in LIGO’s visitor area. However, given LIGO's scale and the complexity of what we do, to have the best and most educational experience possible we encourage everyone to plan to visit on a scheduled tour date.

Note: Spring is field trip season for most schools in the Tri-Cities, and LIGO frequently hosts school field-trips during this time. Most school groups are onsite between 10 a.m. and 1 p.m.. If you plan to 'drop in', we advise avoiding a morning visit in the months of March, April, and May.