The Seattle Mariners today announced plans to require all guests aged 12 and older to show proof of vaccination for all potential 2021 postseason games that may be held at T-Mobile Park. Public Health -- Seattle & King County today announced plans for a vaccine verification policy that is likely to take effect in October.

“The evidence is clear -- vaccination is safe and effective in preventing serious illness from COVID-19. We are making this announcement now to give our Season Ticket Members and other fans the opportunity to get vaccinated before the requirement takes effect,” said Trevor Gooby, Seattle Mariners Sr. Vice President, Ballpark Operations.

Additional details about vaccine verification for T-Mobile Park events will be communicated at a later date.

Mask Mandate

In addition to the upcoming vaccine requirement, the Mariners remind fans ages five and older that they will be required to comply with the latest order from Seattle & King County Public Health that requires masks at all outdoor events with 500 or more people in attendance. The Public Health order applies to fans ages five and older in all locations of T-Mobile Park, including seats and concourses. Masks are not required while fans are actively eating and drinking.

The first Mariners game where the mask mandate will be in effect is Friday, September 10, against the Arizona Diamondbacks. Employees working at T-Mobile Park have been required to wear masks since August 23.

T-Mobile Park Safety Ambassadors will be present in various locations throughout the ballpark on game days to proactively encourage mask compliance. Fans will also be reminded of the Public Health order through signage and Public Address announcements during games. Single-use, multi-layer masks will be available at various locations in the ballpark for those guests who do not have their own.

Employee Vaccine Mandate

All Mariners staff were informed on August 20 that they are required to be fully vaccinated against COVID-19 by October 4 as a condition of employment.

This mandate applies to all Mariners Front Office employees, Event Staff, and Mariners employees at Mariners-operated facilities in the U.S., including Peoria, Arizona and Modesto, California. The mandate also applies to employees of vendors and contractors who work at T-Mobile Park (such as Centerplate, Allied Security, ABM housekeeping services).

The Mariners are following the lead of an increasing number of organizations who believe mandating vaccination is the best way to protect employees. With the spread of the highly transmissible COVID-19 delta variant across the U.S., infection rates among unvaccinated people, and a small number of vaccinated people, continue to rise. The evidence is clear that vaccination is safe and effective in preventing serious illness from COVID-19. Out of an abundance of caution, we believe it is necessary to take this step to more fully protect our employees, their families and our community.