Flu Season Dates 2025

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Flu Season Dates 2025. Here’s what you need to know. In the united states, flu activity typically starts to increase in october, peaks between december and february, and then begins to decline through april and even may.

Data from the cdc shows the 2025 flu season is the worst since 2009, with a number of states seeing a very high level of spread. Here’s what you need to know.