Pollen today
Loading today’s values…
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 Louisville 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 2:00 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 Louisville 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 28 to Nov 3 | Not recorded | Not recorded | 2 Low |
| Oct 21 to Oct 27 | Not recorded | Not recorded | 2 Low |
| Oct 14 to Oct 20 | Not recorded | Not recorded | 3 Moderate |
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 Louisville 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.
27 allergists enrolled in Medicare practice in the Louisville area: 1.93 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 Louisville 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.
The Ohio River marks the lowest ground in Jefferson County, and elevations along its flood plain are 430 to 440 feet.2 The highest ground is in the Muldraugh Hill area, where an escarpment rises abruptly 300 to 400 feet above the lowland.2 Winters at Louisville’s airport average about 38 °F, and a typical year has about 222 days between the last spring freeze and the first fall freeze.1
Trees covered 39% of Louisville in a 2022 tree canopy assessment prepared by the University of Vermont Spatial Analysis Lab.3 That beat the 35% expected in a 2015 report.3 From 2004 to 2012, the canopy declined by the equivalent of about 54,000 trees a year.3
Tall fescue, a cool-season grass, grows on about 5.5 million acres in Kentucky and is the forage base of most of the state’s livestock enterprises.4 Common ragweed is a summer annual, and its pollen is a major contributor to fall hay fever in Kentucky, according to University of Kentucky weed scientists.5
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in Louisville today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central Louisville. 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 Louisville, 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