High Pollen in Louisville, KY

About pollen in Louisville

Weed pollen is the main story in Louisville today, running high and likely noticeable for anyone with sensitivities. Tree and grass pollen, by contrast, are both very low and shouldn't cause much trouble. If you tend to react to ragweed, this is the type of day where symptoms are most likely to show up outdoors. Looking ahead, weed pollen is expected to remain high over the next couple of days before easing slightly, then ticking back up by the end of the five-day stretch. Grass should stay low and steady through midweek, and tree pollen is likely to stay quiet as well. This lines up with the season — early fall in the Louisville area is prime time for ragweed and other late-season weeds, while trees like oak, maple, and honeylocust are well past their spring peak and grasses have largely wound down for the year.

What to do today

• Avoid mowing the lawn and raking leaves.
• When driving the car, close your windows and turn the air conditioning system to recirculation mode.
• Keep your windows closed and turn on your air purifier or air conditioning.
• Consider staying indoors during the peak pollen hours (morning and early afternoon).

Tree map

Every dot is a tree near Louisville, colored by how allergenic it is. Click one for its details, and zoom in for a closer look.

Top tree-pollen sources

The local tree genera behind today's pollen near Louisville. Each bar is that genus's share of the tree pollen.

Meet the trees near you

Get to know the tree types growing around Louisville: what each looks like, how allergenic it is, and when it blooms.

Sugar maple

Acer saccharum

Allergenicity 3/4Blooms spring

American sycamore

Platanus occidentalis

Allergenicity 4/4Blooms spring

Red maple

Acer rubrum

Allergenicity 3/4Blooms spring

Pin oak

Quercus palustris

Allergenicity 4/4Blooms spring

White ash

Fraxinus americana

Allergenicity 4/4Blooms spring

Sweetgum

Liquidambar styraciflua

Allergenicity 2/4Blooms spring

Green ash

Fraxinus pennsylvanica

Allergenicity 4/4Blooms spring

Tulip poplar

Liriodendron tulipifera

Allergenicity 1/4Blooms spring

Eastern red cedar

Juniperus virginiana

Allergenicity 5/4Blooms winter,spring

Swamp white oak

Quercus bicolor

Allergenicity 4/4Blooms spring

Northern catalpa

Catalpa speciosa

Allergenicity 2/4Blooms spring

Northern red oak

Quercus rubra

Allergenicity 4/4Blooms spring

Scarlet red oak

Quercus coccinea

Allergenicity 4/4Blooms spring

American elm

Ulmus americana

Allergenicity 3/4Blooms spring

Black cherry

Prunus serotina

Allergenicity 1/4Blooms spring

Silver maple

Acer saccharinum

Allergenicity 3/4Blooms spring

Common questions

What is the pollen count in Louisville, KY today?

Louisville, KY is at a high 4 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. Over the next five days it ranges from 2 to 4 of 5.

Is weed pollen high in Louisville, KY right now?

Weed pollen is high today at 4 of 5, and it's in season now. Many allergy sufferers will have symptoms.

What plants are causing allergies in Louisville, KY?

The main sources right now are Oak, Honeylocust, Maple, Cladrastis, and Picea. Ragweed (Asteraceae (the daisy family), Late summer, fall) is actively pollinating.