Allergies are not limited to spring and fall. You can have seasonal allergies in the winter as well. Winter allergies are often triggered by house dust mites animal dander and cockroach droppings. As we spent most time indoors during cool weather we are more likely to get attacked by indoor allergens. Dusty air and poor ventilation make the perfect environment for dust mites to thrive which are a common winter allergy trigger. The dampness in the basement and bathrooms also encourages the growth of molds in cold season. Sneezing runny or stuffy nose coughing and postnasal drip itchy eyes nose