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 Indianapolis 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 1:45 pm ET.
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Each thread is one kind of pollen, and each square is one week, colored by that week’s highest level.
Records for Indianapolis began on October 14, 2026. Each week adds a square.
Highest level each week, November 2025 to November 2026, from each day’s forecast.
| Week | Tree | Grass | Weed |
|---|---|---|---|
| Oct 21 to Oct 27 | Not recorded | Not recorded | 2 Low |
| Oct 14 to Oct 20 | Not recorded | Not recorded | 2 Low |
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 Indianapolis 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 11.9% of adults in the city of Indianapolis have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 10.8% to 13.1%). It is a statistical estimate from national survey data, not a count.
29 allergists enrolled in Medicare practice in the Indianapolis area: 1.31 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 Indianapolis 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.
A beech-maple forest once covered the land that became Indianapolis and Marion County.2 American beech was the most common tree before settlement, but a 2015 study found a 95% decline of beech in the county’s remaining natural areas, while sugar maple has more than doubled.2 Silver maple is now the most important street tree, and recent planting in the city focuses on native species that have declined, especially oaks.2
Indiana’s frost-free season, when temperatures stay above 32 °F, has lengthened by an average of nine days since 1915.3 The state’s climate assessment notes that a longer growing season lets plants such as ragweed produce pollen for longer periods.3 At the Indianapolis station, a typical year has about 193 days between the last spring freeze and the first fall freeze.1
Common ragweed is a summer annual found across Indiana and the Midwest.4 Its pollen is carried in the wind and is a major contributor to hay fever in late summer and early fall.4 In 2005, Purdue announced that giant ragweed, a pollen-producing weed that can grow as tall as 15 feet, had topped its list of Indiana’s most problematic weeds for more than eight straight years.5 In the same release, a Purdue Extension weed scientist called Indiana “the giant ragweed national forest.”5
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in Indianapolis today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central Indianapolis. 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 Indianapolis, so each day starts with its own values, and again after Google’s daily model run, usually by about 10:30 am ET. Each section shows when its values were retrieved.
Since October 14, 2026. The year in pollen above fills in as each day is recorded, and weeks before then show no data. Google doesn’t provide past values, so nothing earlier can be added.
Source: Includes pollen data from GoogleIncludes data from Google Maps