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Real-time pollen data for Peoria — updated daily.
Oak is Peoria's dominant tree allergen, with mature specimens throughout West Bluff's century-old residential canopy, Glen Oak Park, Bradley Park, and Bradley University campus. Silver and sugar maple dominate historic residential streets. Cottonwood — a signature Illinois River riparian species — releases visible cotton-like fluff along the floodplain in late spring. Ash, walnut, hickory, elm, mulberry, birch, and box elder add overlapping pollen waves. Juniper and cedar add early season pollen. Basswood (American linden) is a distinctive central Illinois allergen.
Timothy grass dominates central Illinois pastures, road shoulders, and agricultural edges. Kentucky bluegrass fills maintained residential lawns. Orchard grass, perennial ryegrass, and bent grass contribute heavily. Big bluestem and Indian grass — native Illinois prairie species preserved in Wildlife Prairie State Park and Jubilee College State Park — produce pollen primarily in late summer. Johnson grass is present in agricultural zones.
Peoria's position at the center of the Illinois corn belt creates distinctive agricultural pollen exposure unseen in Chicago suburbs. Corn tassels pollinate heavily in late July and early August. Soybean adds mid-summer pollen. Residents in northern Peoria subdivisions, Dunlap, and agricultural-edge neighborhoods experience meaningful summer exposure.
Ragweed is central Illinois's most significant weed allergen, releasing massive pollen loads from mid-August until the first hard frost — typically mid-October in Peoria. Agricultural field margins, fallow land, and prairie restorations amplify exposure. Goldenrod, pigweed, lamb's quarters, marsh elder, and wormwood add additional weed pollen.
The Illinois River and Peoria Lake produce continuous mold spores from riparian vegetation, wetland decomposition, and waterfowl habitat. Floodplain neighborhoods experience elevated mold year-round. Alternaria peaks late summer and early fall. Cladosporium is abundant outdoors year-round. Post-flood mold in vulnerable housing is a recurring concern.
Central Illinois winters bring cold temperatures (January averages 18°F low) and months of primarily indoor living. Dust mites thrive in centrally-heated homes. Pet dander is perennial. Cockroach allergens occur in older multi-family housing. Peoria's exceptional stock of pre-1950 homes in West Bluff, North Valley, and historic downtown often recirculate accumulated dust through aging ductwork.
Diesel particulates from the Illinois River port, I-74 corridor, Caterpillar manufacturing facilities in East Peoria, Keystone Steel & Wire, and agricultural equipment traffic amplify responses to biological allergens.
Severity: Low outdoor, High indoor. Cold central Illinois temperatures (January averages 18°F low) and frozen ground mean minimal outdoor pollen. However, Peoria residents spend months indoors with forced-air heating recirculating dust mite, pet dander, and accumulated dust — particularly severe in century-old West Bluff and North Valley homes.
Severity: Low to Moderate. As temperatures warm above freezing, early-season trees begin pollinating. Elm, maple, and cedar start producing pollen. Snow melt and spring flooding along the Illinois River elevate riparian mold in floodplain neighborhoods.
Severity: Severe. Peoria's worst tree pollen period. Oak reaches peak levels in West Bluff's century-old canopy and Bradley Park. Silver and sugar maple, birch, ash, walnut, mulberry, basswood, and cottonwood add overlapping pollen waves. Cottonwood produces visible fluff along the Illinois River floodplain. Morning fog in floodplain neighborhoods concentrates pollen at breathing height. Central Illinois tornado season begins.
Severity: High. Tree pollen tapers, but grass pollen dominates. Timothy grass, Kentucky bluegrass, orchard grass, and ryegrass produce heavy pollen from lawns, pastures, and agricultural edges. Mold remains elevated from summer humidity and Illinois River riparian vegetation.
Severity: Moderate to High (agricultural zones). Distinctive central Illinois pattern. Corn tassels July-early August with each tassel releasing 2-5 million pollen grains. Soybean pollen adds to the load. Residents in northern Peoria, Dunlap, and agricultural-edge neighborhoods experience meaningful exposure. Grass pollen remains elevated.
Severity: Severe. For many Peoria allergy sufferers, fall is worse than spring. Ragweed peaks from mid-August through the first hard frost (typically mid-October). Big bluestem and Indian grass from Wildlife Prairie State Park and prairie restorations add pollen. Agricultural field margins and fallow land amplify exposure. Alternaria mold peaks. Fall leaf decomposition in bluff canopies adds mold load.
Severity: Declining. First hard frost typically kills ragweed and most outdoor pollen sources by late October or early November. Leaf mold peaks. Indoor allergen concentration begins its winter rise as heating systems activate.
Peoria is a city of two geographies: the Illinois River floodplain (downtown, North Valley, riverfront) and the bluffs rising 200+ feet above (West Bluff, East Bluff, Grandview Drive). This elevation split creates distinctly different allergen exposures. Floodplain residents face higher mold loads year-round from river humidity and occasional flooding, plus morning fog that traps pollen at breathing height. Bluff residents get drier air but heavier tree pollen from mature canopy neighborhoods. If you've moved between these zones within Peoria and your symptoms changed, elevation is likely the reason.
Peoria is the urban center of one of America's most productive corn and soybean regions. Peoria, Tazewell, Woodford, and surrounding counties produce millions of bushels annually. Corn tassels July through early August — each tassel can release 2-5 million pollen grains. While corn pollen is relatively heavy and doesn't travel as far as grass or ragweed pollen, residents in northern Peoria subdivisions, Dunlap, and western Peoria near agricultural edges experience significant summer exposure. Soybean pollen adds to the mix. Agricultural spray drift can also trigger symptoms.
Peoria's 150+ year manufacturing heritage — Caterpillar (12,000+ local employees, manufacturing facilities in East Peoria), Keystone Steel & Wire in Bartonville, chemical production, and former distilleries and breweries — has left a complex air quality legacy. Industrial particulates, diesel from the Illinois River port, and highway traffic along I-74 function as allergen amplifiers. Residents with asthma near manufacturing corridors or downwind from industrial zones often experience worsened biological allergen responses on high-pollution days.
Peoria Lake is a widened section of the Illinois River and a major migratory bird stopover on the Mississippi Flyway. Bald eagles, herons, ducks, and geese concentrate here, especially during spring and fall migrations. Waterfowl droppings in parks like Glen Oak, Lakeview, and along the riverfront can harbor mold and bacterial allergens. Wetland vegetation around the lake produces continuous riparian mold. Avoid prolonged exposure in heavily waterfowl-populated areas if you have severe mold allergies.
Peoria is one of Illinois's oldest continuously inhabited cities, with European settlement dating to 1691. The "whiskey barons" of the late 1800s built many of the city's mansions, Victorians, and churches. West Bluff neighborhoods, North Valley, and historic Downtown loft conversions often have 100+ year old buildings with decades of accumulated indoor allergens. Forced-air heating in older homes recirculates dust mite, pet dander, and historic dust through aging ductwork. Professional duct cleaning and allergen-proof bedding encasements are particularly impactful for historic-home residents.
Central Illinois is deep in Tornado Alley's eastern edge. Spring storms bring tornadoes, hail, and high winds. Storm damage to older housing can create hidden moisture pathways that feed mold for months afterward. If your home experienced storm damage, professional mold inspection prevents months of mysterious indoor symptoms. Peoria's mix of bluff, floodplain, and agricultural topography creates variable storm exposure by neighborhood.
April and May are worst for tree pollen, with oak, maple, cottonwood, ash, and mulberry producing overlapping waves. May through July brings peak grass pollen. July through August adds corn and soybean pollen from surrounding agricultural land. August through October is ragweed season — often the most severe period for Peoria allergy sufferers.
Peoria's bluff-and-floodplain geography creates distinct allergen exposures by neighborhood. Floodplain areas (downtown, North Valley, riverfront) experience elevated humidity, morning fog trapping pollen at breathing height, and higher year-round mold. Bluff neighborhoods (West Bluff, East Bluff) sit in drier air but host heavier tree pollen from century-old canopies. Residents moving between these zones often see symptom changes.
Yes. Peoria sits at the urban center of one of America's most productive corn and soybean regions. Corn tassels produce enormous pollen loads in late July and early August. While corn pollen is relatively heavy and doesn't travel as far as grass or ragweed, residents in northern Peoria, Dunlap, and near agricultural edges experience significant summer agricultural exposure. Spray drift can also trigger symptoms.
Yes. HeyAllergy provides telemedicine appointments with board-certified allergists licensed in Illinois. No waitlist. Available throughout central Illinois including Peoria, East Peoria, Pekin, Morton, Washington, and Bloomington-Normal.
HeyPak® sublingual immunotherapy drops are customized based on allergy blood test results. For Peoria residents, this targets local oak, maple, cottonwood, Timothy grass, Kentucky bluegrass, ragweed, big bluestem, mold, and dust mite allergens specific to central Illinois and the Illinois River valley. Daily drops retrain your immune system with improvement in 3–6 months. Starting at $47/month.
HeyAllergy accepts Medicare and most major PPO health plans, including United Healthcare, Anthem Blue Cross Blue Shield, Cigna, Aetna, Humana, Oscar, and Tricare. Tax ID: 85-0834175.
Peoria Lake — a widened section of the Illinois River — is a major Mississippi Flyway stopover where waterfowl concentrate during spring and fall migrations. Waterfowl droppings harbor mold and bacteria. Wetland vegetation produces continuous riparian mold. Shoreline parks like Glen Oak, Lakeview, and the riverfront have elevated exposure for mold-sensitive individuals.
Indirectly, yes. Peoria's 150+ year manufacturing legacy — Caterpillar, Keystone Steel & Wire, former distilleries, chemical production — has created an air quality environment where industrial particulates amplify immune responses to biological allergens. Residents near manufacturing corridors or downwind from industrial zones often experience worsened pollen and mold symptoms on high-pollution days.
Peoria is central Illinois's largest city and the county seat of Peoria County, with a 2020 population of 113,150. It is the oldest continuously inhabited European settlement in Illinois, founded in 1691 by French explorer Henri de Tonti as Fort Pimiteoui. The city sits halfway between Chicago and St. Louis along the Illinois River, where the river widens to form Peoria Lake. Peoria is a major inland port, trading and shipping center for corn, soybeans, and livestock from one of America's most productive agricultural regions. This deep manufacturing and agricultural identity creates an allergen environment fundamentally different from Chicago's collar-county suburbs like Elgin or Aurora.
Peoria's defining geography is the Illinois River and the dramatic bluffs rising on its western side. Grandview Drive, perched atop one of these bluffs, was called "the world's most beautiful drive" by Theodore Roosevelt. This bluff-and-floodplain duality creates two distinct allergen environments within city limits. Floodplain neighborhoods — downtown, North Valley, the riverfront — experience elevated humidity, morning fog that traps pollen and mold at breathing height, and occasional flooding that drives indoor mold. Bluff neighborhoods — West Bluff, East Bluff, and the elevated subdivisions — sit in drier air but carry mature century-old canopies that produce heavy spring tree pollen. The same allergy sufferer can experience meaningfully different symptoms depending on which Peoria neighborhood they live in.
Peoria is the urban core of one of the most productive corn and soybean regions in the United States. Peoria, Tazewell, Woodford, Stark, Marshall, and Fulton counties produce vast quantities of grain annually. This agricultural setting creates allergen exposure patterns absent from Chicago suburbs: corn pollen peaks in late July and early August, with each tassel releasing millions of grains; soybean pollen adds to mid-summer loads; agricultural spray drift can trigger respiratory symptoms; and prairie grass and ragweed from field margins and fallow land add to the fall pollen burden. Wildlife Prairie State Park preserves native Illinois prairie species — big bluestem, Indian grass, compass plant — that produce distinctive pollen profiles.
Peoria's industrial heritage runs 150+ years deep. Caterpillar Inc. — founded in the Peoria area in 1925 through the merger of Holt Manufacturing and C.L. Best Tractor — maintains 12,000 local employees and major manufacturing facilities in East Peoria despite relocating corporate headquarters in 2018. Keystone Steel & Wire in Bartonville produces woven wire fence. The USDA's National Center for Agricultural Utilization Research, where mass production of penicillin was developed during WWII, conducts over $1 billion in annual research. Before Prohibition in 1920, Peoria was the "Whiskey Capital of the World." This dense industrial and research legacy has shaped local air quality, particulate exposure, and the pattern of allergen-amplifying pollutants across the city.
Peoria Lake — a widened section of the Illinois River — is a major migratory bird stopover on the Mississippi Flyway. Bald eagles, herons, ducks, geese, and migratory waterfowl concentrate here during spring and fall migrations. This creates year-round wetland allergen exposure in shoreline neighborhoods and parks: waterfowl droppings harboring mold and bacteria, continuous riparian mold from wetland vegetation, and elevated summer mosquito populations in lake-adjacent areas. The river widens so much here that the lake portion functions almost as a separate water body with its own microclimate.
Peoria is approximately 62% White, 27% Black or African American — one of the highest concentrations of Black residents in central Illinois and one of downstate Illinois's most diverse cities. Documented health disparities mean lower-income neighborhoods often experience higher asthma burdens, reduced access to specialist care, and housing-related allergen exposures (mold, cockroach, dust mite) at elevated rates. Telemedicine access to board-certified allergists can meaningfully reduce these access gaps for Peoria residents regardless of neighborhood or transportation challenges.
Peoria's Illinois River bluff-and-floodplain geography, Central Illinois corn belt agricultural exposure, 150+ year industrial and manufacturing air quality legacy, Peoria Lake waterfowl wetland environment, historic housing stock indoor allergen patterns, and tornado-corridor storm risk create an allergy environment unique in downstate Illinois. HeyAllergy connects Peoria residents with board-certified allergists through telemedicine. Patients receive allergy blood testing, personalized treatment, and HeyPak® sublingual immunotherapy drops custom-formulated for central Illinois's specific allergen profile. Treatment starts at $47/month. No needles, no clinic visits, no waitlist.
