Pollen Calendar
When each allergen is active in the US, weighted by your IgE sensitization — darker means an allergen you react to strongly is at peak. Seasons are generalized national ranges; your region will shift them.
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Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Trees
off-seasonpeak × highest IgE
View as table
| Allergen | IgE (kU/L) | Class | Active months |
|---|---|---|---|
| Rye Grass | 100 | 6 | May, Jun, Jul |
| Timothy Grass | 100 | 6 | May, Jun, Jul |
| Johnson Grass | 63.9 | 5 | May, Jun, Jul, Aug, Sep, Oct |
| Bermuda Grass | 23.5 | 4 | Apr, May, Jun, Jul, Aug, Sep |
| Walnut Tree | 9.61 | 3 | Apr, May, Jun |
| Olive | 7.04 | 3 | Mar, Apr, May, Jun |
| Grey Alder | 6.83 | 3 | Jan, Feb, Mar, Apr |
| Elm | 6.33 | 3 | Feb, Mar, Apr |
| Oak | 6.07 | 3 | Feb, Mar, Apr, May, Jun |
| Maple Leaf Sycamore | 5.66 | 3 | Mar, Apr, May |
| Box Elder | 5.41 | 3 | Mar, Apr, May |
| Acacia | 5.13 | 3 | Jan, Feb, Mar, Apr |
| Common Silver Birch | 5.11 | 3 | Mar, Apr, May |
| Cottonwood | 4.79 | 3 | Feb, Mar, Apr |
| Mountain Cedar | 2.72 | 2 | Jan, Feb, Nov, Dec |
| Mulberry | 1.9 | 2 | Feb, Mar, Apr, May |
| English Plantain | 7.6 | 3 | Apr, May, Jun, Jul, Aug, Sep |
| Sheep Sorrel | 7.51 | 3 | May, Jun, Jul |
| Lambs Quarter | 5.44 | 3 | Jun, Jul, Aug, Sep, Oct |
| Common Pigweed | 5.16 | 3 | Jul, Aug, Sep, Oct |
| Russian Thistle | 5.05 | 3 | Jul, Aug, Sep, Oct |
| Mugwort | 4.64 | 3 | Aug, Sep, Oct |
| Western Ragweed | 3.22 | 2 | Aug, Sep, Oct |
| Dust Mite | 24.5 | 4 | Year-round |
| Cat Dander | 1.36 | 2 | Year-round |
| Dog Dander | 0.7 | 2 | Year-round |
| Aspergillus Fumigatus | 0.11 | 0 | Year-round |
| Alternaria Alternata | 0.1 | 0 | May, Jun, Jul, Aug, Sep, Oct |
| Cladosporium Herbarum | 0.1 | 0 | Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |