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When is the best month to get the flu vaccine?

Medically reviewed by Leigh Ann Anderson, PharmD. Last updated on Oct 31, 2024.

Official answer

by Drugs.com

In the U.S. the months of September and October are recommended as the best months to get vaccinated if you only need one dose of a flu vaccine. It takes about 2 weeks after a flu vaccine to build immunity against the virus.

Children who are 6 months through 8 years of age who require two doses (usually because it’s the first season they are vaccinated) should receive the first dose as soon as the flu vaccine is available.

Annual vaccination during July and August is not recommended for most people as it may be too early, especially adults (particularly those aged ≥65 years) and pregnant persons in the first or second trimester (unless there is concern that later vaccination might not be possible). Immunity could wane by the peak of the flu season in the winter. Speak to your healthcare provider if needed.

Common flu vaccines include:

Needle-free vaccines include FluMist for ages 2 through 49 years of age and Afluria, that can be used with the Stratis jet-injector (when available).

FluMist for self- or caregiver administration, while approved, is not expected to be available until the 2025-2026 influenza season. It will still require a prescription.

Vaccination during July and August can be considered for children of any age who require only 1 dose and for pregnant persons who are in their third trimester during those months.

If you or your child does not get the flu vaccine in September or October, you should still talk to your doctor or pharmacist about getting a flu vaccine. Vaccination is continued throughout the season if flu viruses are still circulating.

This is not all the information you need to know about the flu vaccine for safe and effective use and does not take the place of your doctor’s directions. Review the full product information and discuss this information and any questions you have with your doctor or other health care provider.

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References
  • Summary: Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices (ACIP)—United States, 2024-25. Centers for Disease Control and Prevention (CDC). Sept 17, 2024. Accessed Oct 23, 2024 at https://www.cdc.gov/flu/hcp/acip/
  • Key Facts about seasonal flu vaccine. Sept 17, 2024. US Centers for Disease Control and Prevention (CDC). Accessed Oct 23, 2024 at https://www.cdc.gov/flu/vaccines/keyfacts.html

Read next

How well does the flu vaccine work?

Flu vaccination typically reduces the risk of flu illness by between 40% and 60% during seasons when the flu viruses are well-matched to the flu vaccine. But if you are infected with the virus, the vaccine reduces your chances of getting the flu and passing it on to others and lessens the severity of symptoms, hospitalizations and death. Continue reading

Where can I get the flu vaccine right now?

You can find the flu vaccine most quickly at your local pharmacy, where you can usually walk in without an appointment. To save time, you might prefer to make an appointment. Call your pharmacist to be sure they have the current year's vaccine in stock. Continue reading

How can I get a flu vaccine without a needle?

Options that are available for a needle-free flu vaccine are the FluMist nasal spray for people 2 to 49 years of age and the Afluria vaccine given with the Stratis needle-free jet injector for ages 18 through 64 years. Check with your healthcare provider to see if you are eligible. Continue reading

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