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 Harrisburg 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 1:21 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 Harrisburg 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 | 1 Very low |
| Oct 14 to Oct 20 | Not recorded | Not recorded | 1 Very 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 Harrisburg 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.
10 allergists enrolled in Medicare practice in the Harrisburg area: 1.62 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 Harrisburg 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.
Blue Mountain, part of the Kittatinny Ridge, cuts through the center of Dauphin County, and all of the county drains into the Susquehanna River.2 The Great Valley Section, which covers central Cumberland and lower Dauphin counties, has a flat to rolling topography underlain by limestone and shale.2 It holds most of the area’s urban and intensely farmed land.2 A typical year at Harrisburg International Airport has about 206 days between the last spring freeze and the first fall freeze.1
Forests dominated by white, red, scarlet and black oaks occur on the slopes and tops of the area’s mountain ridges.2 Statewide, the most common tree species is red maple.3 It is one of the first trees to flower in early spring.4
Orchardgrass, a perennial cool-season grass, forms seed heads in spring, from early May in early varieties to late May or early June in late ones.5 Ragweed follows in late summer, and across Pennsylvania its pollen generally peaks in the last week of August and the first week of September.6
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in Harrisburg today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central Harrisburg. 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 Harrisburg, 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