CERN Open Days

Every 4-5 years, during a "long shutdown", CERN opens its doors to the public for two special days at the heart of one of the world’s largest particle-physics laboratories.

OpenDays 2019 - Highlight pictures
Photo taken during the Open Days on 14 and 15 September 2019. (Image: CERN)

The CERN Open Days have become a regular feature of the period called the “long shutdown” during which the accelerators stop for around two years, to benefit from upgrades and renovation work. 

The last edition of the Open Days happened in September 2019. It gave 75'000 visitors the chance to discover CERN's facilities, both underground and on the surface. With free admission to debates, film screenings, theatre performances, experimental workshops and dozens of visit points spread all over the site, CERN volunteers take the visitors to the heart of the Laboratory during two days.

2 days
Âge minimum
Other language (subject to availability)
Time of the year
Every 4-5 years

On many CERN sites

Plus d'informations

Website of the last edition: