Home / Ask The Experts / When the expiration date of a vaccine indicates a month and year, does the vaccine expire on the first or last day of the month?

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Vaccine Viability and Expiration

When the expiration date of a vaccine indicates a month and year, does the vaccine expire on the first or last day of the month?

Vaccine may be used through the last day of the month indicated on the expiration date. After that, do not use it. Monitor your vaccine supply carefully so that vaccines do not expire.

Last reviewed: July 26, 2023

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When the expiration date of a vaccine indicates a month and year, does the vaccine expire on the first or last day of the month?

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