High Pollen in Boulder, CO

About pollen in Boulder

Weed pollen is the main driver of today's conditions in Boulder, running high and likely to be noticeable for anyone with seasonal sensitivities. Tree pollen, by contrast, is very low and should not be a concern. Overall, this adds up to a day where sensitive individuals may want to take some precautions, especially during outdoor activity in the afternoon. Looking ahead, weed pollen is expected to stay high over the next several days and could climb even further by midweek before easing slightly. This lines up with the typical late-summer pattern in the region, when ragweed and other weeds become the dominant source of pollen after the earlier tree season — which for Boulder usually includes cottonwood, elm, and juniper — has long since wound down. Tree pollen should remain minimal throughout the period, so weed exposure will be the main factor to keep in mind through the coming days.

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).

Common questions

What is the pollen count in Boulder, CO today?

Boulder, 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 Boulder, CO 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 Boulder, CO?

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