Seasonal Allergic Rhinitis
Seasonal Pollen & Allergen Calendar — When Allergy Seasons Peak
Commonly referred to as "hay fever", allergic rhinitis affects millions globally. It is triggered by outdoor aeroallergens, primarily pollens from trees, grasses, and weeds, as well as outdoor mold spores. Understanding different pollen types is the foundation of effective avoidance.
Seasonal Timeline
- Spring: Tree pollen (birch, cedar, oak, pine).
- Summer: Grass pollen (timothy, Bermuda, orchard).
- Fall: Weed pollen (ragweed, nettle, mugwort).
- Winter: Generally a relief period for outdoor allergies, though indoor allergens may worsen. Mold allergies often spike with damp autumn leaves.
Geographic Variation
Your region dramatically affects your seasonal allergy burden. Our seasonal allergy regional guide maps the worst allergy cities and seasons by US geography. Meanwhile, climate change is extending pollen seasons by weeks, increasing the potency and geographic spread of allergenic plants.
Treatment Options
First-line therapies include intranasal corticosteroids and oral second-generation antihistamines. For severe, refractory cases, allergen immunotherapy (subcutaneous injections or sublingual tablets) provides long-term relief.