Seasonal Allergies in Canada: Symptoms, Treatment, and Timing

Seasonal allergies (allergic rhinitis or hay fever) affect approximately 20 to 25% of Canadians. Knowing when allergens peak and how to manage symptoms improves quality of life. Canadian allergy seasons vary by region. Tree pollen (March to June), grass pollen (May to July), ragweed pollen (August to October), and mould spores (spring through fall) are the main triggers. Symptoms include sneezing, runny or congested nose, itchy/watery eyes, post-nasal drip, and fatigue. Unlike a cold, allergies do not cause fever and symptoms persist as long as exposure continues. Treatment options include antihistamines (cetirizine, loratadine, fexofenadine - available OTC), nasal corticosteroid sprays (fluticasone - first-line treatment for moderate to severe symptoms), decongestants (short-term use only - nasal sprays should not exceed 3 days), and allergen immunotherapy (allergy shots or sublingual tablets for severe, persistent cases). Preventive strategies include checking local pollen counts before outdoor activities, keeping windows closed during high-pollen days, showering after spending time outdoors, using HEPA air purifiers indoors, and drying clothes indoors during pollen season. If OTC treatments are insufficient, your physician can discuss prescription options or referral to an allergist. *This article is for informational purposes only.*

This article is for informational purposes only and does not constitute medical advice. Content reviewed by licensed Canadian physicians. Last updated February 2026.