Flu season is the time of year when you are most likely to get sick from the flu. In general, flu season can start anytime in late fall, peak in mid-to-late winter (usually January or February), and continue through early spring. On average, flu season lasts about 13 weeks.
https://www.verywellhealth.com/flu-season-from-start-to-peak-and-end-2633835
“Public health authorities do not require providers report flu cases so we do not know exact flu numbers.”
https://www.dshs.state.tx.us/flu/surveillance.aspx