Question 1

When is pollen season in Ottawa?

Accepted Answer

Ottawa pollen season runs from April to October. Tree pollen (birch, alder, maple) peaks in April–May. Grass pollen is highest in June–July. Ragweed pollen dominates from mid-August through September, often until the first frost.

Question 2

What pollen is high right now in Ottawa?

Accepted Answer

Check this page for real-time pollen levels in Ottawa. The forecast shows current counts for birch, alder, grass, ragweed, and mugwort pollen. Data is updated every 6 hours from Open-Meteo.

Question 3

When is ragweed season in Ottawa?

Accepted Answer

Ragweed season in Ottawa typically runs from mid-August to late September or early October, ending with the first hard frost. Ragweed is the most common cause of fall allergies in Ottawa — a single plant can produce up to 1 billion pollen grains per season.

Question 4

What time of day is pollen worst in Ottawa?

Accepted Answer

Pollen counts are typically highest in the morning between 5 AM and 10 AM when plants release pollen. On warm, dry, windy days, pollen can remain elevated throughout the day. Rain temporarily reduces pollen counts.

Question 5

How can I reduce pollen allergy symptoms in Ottawa?

Accepted Answer

Check the pollen forecast before outdoor activities. Stay indoors during peak pollen hours (5–10 AM). Keep windows closed on high pollen days. Shower and change clothes after being outside. Use HEPA air filters indoors. Consider over-the-counter antihistamines or consult a doctor for prescription options.

Pollen Type	Season	Peak Months	Common Sources
🌳 Tree Pollen	Spring	April – May	Birch, Alder, Maple, Oak, Ash
🌾 Grass Pollen	Summer	May – July	Timothy, Kentucky Bluegrass, Ryegrass
🤧 Ragweed Pollen	Late Summer/Fall	August – September	Common Ragweed (Ambrosia artemisiifolia)
🌿 Mugwort Pollen	Late Summer	July – September	Mugwort (Artemisia vulgaris)

Ottawa Pollen Season Calendar

Ottawa Allergy Statistics