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 Sioux Falls 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 1:08 pm CT.
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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 Sioux Falls 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 Sioux Falls 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 9.9% of adults in the city of Sioux Falls have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 8.9% to 10.9%). It is a statistical estimate from national survey data, not a count.
7 allergists enrolled in Medicare practice in the Sioux Falls area: 2.22 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 Sioux Falls 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.
Ash made up an estimated 40% of the street trees in Sioux Falls in 2018, about 22,800 of 57,000.2 Counting park, public and private trees as well, the city estimated that about 26% of its 326,250 trees were ash.2 The natural range of silver maple reaches southeastern South Dakota.3 Across North America, it is the first of the maples to bloom, beginning as early as February and extending into May.3
Winters average about 21 °F, and a typical year has about 157 days between the last spring freeze and the first fall freeze.1 In South Dakota, western wheatgrass begins flowering by mid to late June.4
SDSU Extension reports that herbicide-resistant common ragweed has been confirmed in South Dakota.5 Its guide says common ragweed flowers from July to September in most cases, and giant ragweed from August to October.5 A single common ragweed plant can produce between 100 million and 3 billion pollen grains, depending on its size.5
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in Sioux Falls today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central Sioux Falls. 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 Sioux Falls, so each day starts with its own values, and again after Google’s daily model run, usually by about 9:30 am CT. Each section shows when its values were retrieved.
Source: Includes pollen data from GoogleIncludes data from Google Maps