Fighting fall allergies as the weather shiftsThe leaves changing colors is a sign that the fall season is here. Dr. Buddiga adds that a mild cough is also a symptom of fall allergies. "Almost at the end of August to the first weeks of September, I've been seeing fall allergies," said Dr. Buddiga. Dr. Buddiga says fall allergies tend to peak around the end of October and beginning of November. But there are ways to fight fall allergies, such as using nasal sprays or taking antihistamines.