High Pollen in Denver, CO

About pollen in Denver

Weed pollen is the main story in Denver today, running high enough to cause noticeable symptoms for anyone with sensitivities. Trees are quiet this time of year, so if you are feeling stuffy or itchy-eyed outdoors, weeds are the likely culprit rather than any lingering tree exposure. Looking ahead, weed pollen is expected to stay high through the next several days, even climbing slightly by midweek before easing a bit toward the end of the forecast period. This tracks with the season, as late summer in Denver typically brings ragweed and other weeds to the forefront while tree species like Malus, Crataegus, Plane, Prunus, and Koelreuteria have long finished their spring pollen release. Anyone sensitive to weed pollen should expect conditions to remain active for now, with little relief in the immediate outlook.

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 Denver, 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 Denver. Each bar is that genus's share of the tree pollen.

Meet the trees near you

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

Plains cottonwood

Populus sargentii

Allergenicity 3/4Blooms spring

Green ash

Fraxinus pennsylvanica

Allergenicity 4/4Blooms spring

Siberian elm

Ulmus pumila

Allergenicity 3/4Blooms spring

Honey locust

Gleditsia triacanthos

Allergenicity 2/4Blooms spring

Austrian pine

Pinus nigra

Allergenicity 1/4Blooms spring

Northern hackberry

Celtis occidentalis

Allergenicity 3/4Blooms spring

Boxelder

Acer negundo

Allergenicity 3/4Blooms spring

Crack willow

Salix fragilis

Allergenicity 3/4Blooms spring

White ash

Fraxinus americana

Allergenicity 4/4Blooms spring

Scotch pine

Pinus sylvestris

Allergenicity 1/4Blooms spring

Quaking aspen

Populus tremuloides

Allergenicity 3/4Blooms spring

Rocky mountain juniper

Juniperus scopulorum

Allergenicity 5/4Blooms winter,spring

Flowering pear

Pyrus calleryana

Allergenicity 1/4Blooms spring

Pinyon pine

Pinus edulis

Allergenicity 1/4Blooms spring

Silver maple

Acer saccharinum

Allergenicity 3/4Blooms spring

Peachleaf willow

Salix amygdaloides

Allergenicity 3/4Blooms spring

Common questions

What is the pollen count in Denver, CO today?

Denver, CO 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 4 to 5 of 5.

Is weed pollen high in Denver, CO right now?

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

What plants are causing allergies in Denver, CO?

The main sources right now are Malus, Crataegus, Plane, Prunus, and Koelreuteria. Elm (Ulmaceae (the Elm family), Two distinct seasons, late winter to early spring, and late summer to fall (species dependent)) is actively pollinating.