Small groups and individuals are welcome to stop by Monday, Tuesday, Thursday, and Friday between 10:00 a.m. and 4:00 p.m.. On Wednesdays you may visit between 9 a.m. and 2 p.m. LIGO is closed to drop-in visitors weekends and holidays.
During an un-hosted drop-in visit, you can view a number of posters, exhibits, and hardware displays in LIGO’s visitor area and auditorium. 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 monthly tour date. Our monthly public site tours are free and do not require a reservation.
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 think you may 'drop in', we suggest you avoid morning visits in the months of March, April, and May.