Pollen today
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Pollen today
Loading today’s values…
Google gave no index for tree, grass or weed pollen here today.
Next four days, highest level each day:
Source: Includes pollen data from GoogleGoogle Maps
Source: Includes pollen data from GoogleIncludes data from Google Maps
Google’s index for each plant it models in Denver today. A plant out of season has no index.
Source: Includes pollen data from GoogleGoogle Maps
The forecast that moves pollen around, and the air beside it.
Forecast: National Weather Service, updated 11:46 am MT.
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Each thread is one kind of pollen, and each square is one week, colored by that week’s highest level.
Google has given no index for Denver since records began on October 14, 2026.
Highest level each week, November 2025 to November 2026, from each day’s forecast.
Source: Includes pollen data from GoogleIncludes data from Google Maps
What this forecast doesn’t measure, and when to get help.
Google’s index covers tree, grass and weed pollen only, so there is no mold level for Denver on this page. The National Allergy Bureau publishes pollen and mold counts measured at its stations. Our guides cover common molds such as Alternaria, Cladosporium and Aspergillus.
The forecast doesn’t cover allergens indoors either: dust mites, cockroaches, mice, cats and dogs. Our guides explain each one, starting with dust mites and cats.
An estimated 10.4% of adults in the city of Denver have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 9.3% to 11.6%). It is a statistical estimate from national survey data, not a count.
51 allergists enrolled in Medicare practice in the Denver area: 1.65 for every 100,000 people, more than the 1.22 across the US. The count doesn’t show how soon you can get an appointment. See the doctors listed in the Denver area, or how every state and metro compares.
AllergyNest count from CMS’s Doctors and Clinicians file (October 2026) and Census population estimates for 2025.
The geography, climate and plants behind each season here, with a source for every fact.
An estimated 1.45 million ash trees grow across the Denver metro area.2 Statewide, ash makes up about 15% of the trees in Colorado’s urban forest.2
Colorado’s climate is semiarid, and its major landforms include the High Plains in the east and the Rocky Mountains in the center of the state.3 On the eastern plains and in the valleys, most precipitation falls in spring and summer.3 A typical year at Denver International Airport brings close to 15 inches of precipitation and a freeze-free season of about 156 days.1
Weld County’s health department, describing pollen in Colorado, says tree pollen is often the first to appear each year and often overlaps with grass pollen in spring and summer.4 The same page says weed pollen appears in late summer and fall, and it lists Russian thistle, sagebrush and pigweed among common weeds.4 Russian thistle typically flowers from July through October.5
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in Denver today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central Denver. A pollen count is the number of pollen grains measured in a cubic meter of air at a counting station. How our pollen index works.
Twice a day. We fetch new values soon after midnight in Denver, so each day starts with its own values, and again after Google’s daily model run, usually by about 8:30 am MT. Each section shows when its values were retrieved.
Source: Includes pollen data from GoogleIncludes data from Google Maps