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Real-time pollen data for Marietta — updated daily.
Oak is Marietta's dominant tree allergen, and here it runs longer than in flatter suburbs. White oak, red oak, chestnut oak, post oak, and water oak occur across the city and throughout Kennesaw Mountain. Because trees at higher elevation release later than those on the valley floor, oak season is staggered rather than compressed — valley trees finish while mountain slopes are still producing. Old-growth stands in the park hold especially large, high-output specimens.
Hickory is a defining component of Piedmont oak-hickory forest and significantly allergenic. Kennesaw Mountain's upland hardwood assemblages carry substantial hickory, and the same elevation-driven delay applies — extending hickory pollen later than in surrounding communities.
Loblolly, shortleaf, and Virginia pine occur throughout Marietta's residential neighborhoods and across the park's mixed stands, producing the visible spring yellow film. Grains are large and less efficient at reaching deep airways than oak or hickory, but volume makes pine a meaningful irritant.
Sweetgum is abundant and significantly allergenic. Red maple, elm, tulip poplar, beech, and ash occur across the mountain's varied forest assemblages and in city neighborhoods. Cedar and juniper open the season in February. Slope aspect and elevation spread their release across a wider window than in flat terrain.
Pollen production scales with tree size and maturity. Kennesaw Mountain National Battlefield Park preserves roughly 2,900 acres of largely uncleared land, part of it recognized old-growth forest containing trees far older and larger than surrounding neighborhoods hold. These stands are among the most productive pollen sources in Cobb County.
Bermuda grass dominates lawns, parks, athletic fields, and the park's open battlefield areas. Fescue and ryegrass are common on shaded residential lots. Johnson grass grows along roadway margins and trail edges.
Ragweed is the dominant fall allergen, with open battlefield ground, trail margins, and utility easements providing habitat. Pigweed, lamb's quarters, nettle, and plantain contribute. Goldenrod blooms conspicuously alongside but is insect-pollinated and produces little airborne pollen.
Piedmont red clay drains slowly, holding water against foundations after heavy thunderstorms. Creek drainages and the park's shaded north-facing slopes retain moisture, sustaining fungal spore production. Cladosporium and Alternaria peak in late summer and early fall. Aspergillus and Penicillium are common indoors. Deep old-growth leaf litter decomposes continuously.
Aerospace manufacturing operations and Dobbins Air Reserve Base contribute industrial and aviation particulate. I-75 along the eastern side and major surface arterials carry heavy commuter volume concentrated at peak hours. These inflame airway linings and amplify reactions to biological allergens.
Dust mites thrive in the humid subtropical climate. Pet dander is significant. Marietta's older housing stock around the historic core carries elevated indoor mold and cockroach allergen risk relative to newer construction.
Severity: Low. Trees, grasses, and weeds are dormant across both the city and the mountain. Indoor allergens dominate, with dust mites and pet dander peaking under closed-window heating. Older housing around the historic core carries elevated indoor mold risk. Cedar and juniper may begin by mid-January, starting at lower elevation first. This is the window to establish preventive treatment.
Severity: Moderate. Season begins on the valley floor while the mountain remains dormant. Maple, elm, cedar, and juniper lead in the city. Oak and hickory start ramping at lower elevation. Pine begins producing. South-facing lower slopes follow shortly behind the valley; north-facing and upper slopes lag.
Severity: Severe. Oak, hickory, sweetgum, and pine peak across Marietta's historic canopy and lower elevations. The visible yellow pine film coats surfaces. Old-growth stands on the mountain's lower slopes come into full production. Mature street trees around the Square contribute heavily. Dry, windy afternoons spike counts sharply.
Severity: High. Where flatter suburbs see counts collapse, Marietta does not. Upper-elevation and north-facing slopes on Kennesaw and Little Kennesaw reach peak release now, extending oak and hickory well past when the valley finished. Residents who stopped preventive medication after the pine film washed away often find this stretch unexpectedly difficult. Grass begins climbing on lawns and open battlefield ground.
Severity: High. Bermuda grass dominates lawns, parks, and the park's open battlefield areas. Summer heat and humidity build. Shaded north-facing slopes and creek drainages hold moisture, sustaining mold. Thunderstorms arrive, with red clay holding water against foundations. Ragweed opens in August. Trail use remains heavy.
Severity: High. Ragweed peaks in September along open battlefield ground, trail margins, and easements. Alternaria and Cladosporium reach annual highs. Leaf fall from old-growth and historic canopy is substantial, and deep litter decomposing on shaded slopes sustains Cladosporium and Aspergillus well into late autumn before counts drop toward winter.
Most metro Atlanta cities get a compressed spring — oak, hickory, sweetgum, and pine peaking within roughly the same two weeks. Marietta does not, and Kennesaw Mountain is the reason. Air temperature falls as elevation rises, and tree flowering is driven by accumulated warmth. The same oak species growing at 1,800 feet on the summit reaches pollen release meaningfully later than its counterpart at 1,100 feet on the valley floor where the city sits. With roughly seven hundred feet of relief from base to peak, Marietta effectively gets a staggered release: the valley finishes while the mountain is still going. The practical consequence is that residents here often find late April and early May harder than neighbors in Alpharetta or Johns Creek, whose tree season has already collapsed. If you have historically stopped preventive medication once the yellow pine film washes off your car, you are likely stopping too early.
Elevation is not the only variable — slope aspect shifts timing as well. South-facing slopes receive more direct sun, warm earlier in the season, and push their trees into pollen release ahead of north-facing slopes on the same mountain at the same elevation. North-facing slopes stay cooler and damper and run later. Because Kennesaw Mountain and Little Kennesaw present slopes in every direction around the park's roughly 2,900 acres, the mountain generates a genuine spread of release dates rather than a single pulse. Which neighborhood you live in relative to the mountain, and which trails you use, changes your exposure timing by days.
Part of Kennesaw Mountain National Battlefield Park is recognized old-growth forest — stands that have never been cleared, containing trees far older and larger than anything in surrounding neighborhoods. This matters because pollen production scales with tree size and maturity. A century-old oak releases vastly more pollen than a young one, and old-growth stands hold concentrations of exactly those trees. Roughly 2,900 acres of largely forested, never-developed land sits directly against the city, and it is among the most productive pollen sources in Cobb County. That is not an argument against the park — it is an argument for knowing your specific triggers so you can time your visits.
The park draws well over a million visitors a year across roughly eighteen miles of trails, and the signature route is a seven-hundred-foot climb to the summit. That combination deserves thought during spring. Climbing is sustained exertion, which increases how much air you move and shifts breathing toward the mouth — and you are ascending into the part of the mountain that is releasing pollen latest. Take antihistamines and nasal sprays days beforehand rather than that morning, carry a rescue inhaler if you have asthma, and prefer late morning after dew has lifted or the days following rain. Shower and change when you get home rather than carrying summit pollen into your bedding.
Marietta was founded in 1834 and its older neighborhoods around the Square carry correspondingly old street trees — large mature oaks planted generations ago and left in place. Combined with the mountain, this gives Marietta an unusually high proportion of large, old, heavily productive trees relative to newer suburbs built on cleared farmland. Established canopy is a genuine civic asset and a genuine pollen load. If you live in the historic core, expect higher tree counts than a comparable house in a 1990s subdivision a few miles away.
Kennesaw Mountain is the highest point in the metro Atlanta area at 1,808 feet, but it is a monadnock — an isolated erosional remnant standing alone above the surrounding Piedmont rather than part of a range. That isolation matters. Instead of a continuous highland with a uniformly cooler climate, Marietta gets a single steep island of delayed phenology surrounded by ordinary Piedmont at ordinary Piedmont timing. Your exposure depends heavily on proximity: within a mile or two of the park you feel the extended tail clearly, while across town it fades considerably.
Kennesaw Mountain. Air temperature falls as elevation rises, and tree flowering depends on accumulated warmth, so the same oak species at 1,800 feet on the summit releases pollen later than its counterpart at 1,100 feet in the city. With about seven hundred feet of relief, Marietta gets a staggered release — valley trees finish while mountain slopes are still producing. Flatter suburbs like Alpharetta and Johns Creek get a compressed peak instead.
Late March through early May, and the season runs later here than in surrounding cities because of the mountain's elevation effect. Grass follows from May into September. Ragweed peaks August through October. Many Marietta residents find late April and early May harder than neighbors elsewhere in the metro, whose tree season has already ended.
It can shift your timing by days. South-facing slopes get more direct sun, warm earlier, and release pollen ahead of north-facing slopes at the same elevation, which stay cooler and run later. Because Kennesaw and Little Kennesaw present slopes in every direction across roughly 2,900 acres, the mountain produces a genuine spread of release dates rather than one synchronized pulse.
Pollen output scales with tree size and age, and part of the park is recognized old-growth forest — stands never cleared, holding trees far older and larger than surrounding neighborhoods contain. A century-old oak produces vastly more pollen than a young one. Roughly 2,900 acres of largely uncleared forest sits directly against the city, making it among the most productive pollen sources in Cobb County.
Not necessarily — but time it deliberately. The summit route is a seven-hundred-foot climb, and sustained exertion increases how much air you move while shifting breathing toward the mouth, bypassing nasal filtering. You are also ascending toward the slopes releasing latest in the season. Start preventive medication days beforehand, carry a rescue inhaler if you have asthma, favor late morning or the days after rain, and shower and change clothes afterward.
Yes. HeyAllergy provides telemedicine appointments with board-certified allergists licensed in Georgia. No waitlist. Available throughout Cobb County and northwest metro Atlanta including Marietta, Kennesaw, Smyrna, Acworth, Powder Springs, and surrounding communities.
HeyPak® sublingual immunotherapy drops are customized based on allergy blood test results. For Marietta residents, this targets local oak, hickory, sweetgum, pine, Bermuda grass, ragweed, mold, and dust mite allergens specific to the Piedmont. Daily drops placed under the tongue retrain your immune system rather than just suppressing symptoms, with improvement typically seen in 3–6 months. Treatment is recommended for 3–5 years for lasting relief. Starting at $47/month.
HeyAllergy accepts Medicare and most major PPO health plans, including United Healthcare, Anthem Blue Cross Blue Shield, Blue Shield, Cigna, Aetna, Humana, Oscar, and Tricare. Contact your insurance provider with Tax ID: 85-0834175 to confirm telemedicine coverage.
Marietta is a city of approximately 64,000 and the seat of Cobb County, roughly twenty miles northwest of downtown Atlanta at an elevation near 1,100 feet. Founded in 1834, it is among the older cities in the metro area, organized around a historic town square with correspondingly old residential neighborhoods and mature street canopy. Two miles northwest, Kennesaw Mountain rises to 1,808 feet — the highest point in the Atlanta metropolitan area — within a National Battlefield Park of roughly 2,900 acres. That mountain does something to Marietta's pollen calendar that no other metro Atlanta city experiences.
Kennesaw Mountain is a monadnock, or inselberg: an isolated erosional remnant of a former range, standing alone above the surrounding Piedmont rather than forming part of a continuous highland. It rises roughly 708 feet from its base to a summit of 1,808 feet, with Little Kennesaw reaching about 1,600 feet nearby. Because air temperature declines with elevation and tree flowering is governed by accumulated warmth, trees on the mountain's upper slopes reach pollen release later than the same species growing on the valley floor. Slope aspect compounds the effect — south-facing slopes warm earlier and release ahead of cooler north-facing slopes at identical elevation. The result is that Marietta receives a staggered, extended tree pollen season rather than the tightly compressed two-week peak typical of flatter metro suburbs. The valley finishes while the mountain is still producing.
Kennesaw Mountain National Battlefield Park was established in February 1917 and preserves land that has largely never been cleared. Part of its natural area is recognized old-growth forest by the Old-Growth Forest Network — an uncommon designation anywhere, and remarkable directly adjacent to a metropolitan suburb. This matters for allergen exposure because pollen output scales with tree size and age: a century-old oak produces vastly more than a young one, and old-growth stands concentrate precisely those trees. The park is mostly forested across a range of assemblages, making it one of the most productive pollen sources in Cobb County.
The park recorded well over a million visitors in 2025 across roughly eighteen miles of trails, with the signature route being a seven-hundred-foot climb from the visitor center to the summit. This places substantial numbers of people in sustained physical exertion within the highest-pollen environment in the county, and ascending specifically toward the slopes that release latest in the season. Exertion increases the volume of air moved through the lungs and shifts breathing from nasal to oral, which bypasses the nose's filtering function — meaning a spring summit hike delivers a considerably larger allergen dose than the same time spent stationary in town.
Marietta's 1834 founding left it with historic neighborhoods surrounding Marietta Square where large street oaks planted generations ago remain in place. Compared with newer suburbs built on cleared farmland, Marietta carries an unusually high share of large, old, heavily productive canopy trees. Combined with the mountain, this gives the city a tree pollen profile weighted toward mature specimens rather than the younger successional growth common in more recently developed parts of the metro.
Away from the mountain, Marietta sits on typical Piedmont terrain: red clay soils that drain slowly and hold moisture against foundations after the region's heavy thunderstorms, mixed oak-hickory-pine forest, and creek drainages feeding toward the Chattahoochee to the south. Aerospace manufacturing and Dobbins Air Reserve Base sit within the city, contributing industrial and aviation particulate that inflames airway linings and amplifies biological allergen responses. I-75 runs through the eastern side with heavy commuter volume concentrated at peak hours.
Marietta's position beneath a 1,808-foot monadnock producing altitude-delayed pollen release and an extended rather than compressed tree season, recognized old-growth forest concentrating the largest and most productive trees directly against the city, slope aspect generating a spread of release timing across neighborhoods, over a million annual visitors exerting themselves on steep high-pollen ground, and a historic street canopy weighted toward large mature trees create an allergy environment distinct from anywhere else in metro Atlanta. HeyAllergy connects Marietta residents with board-certified allergists through telemedicine. Patients receive allergy blood testing, personalized treatment, and HeyPak® sublingual immunotherapy drops custom-formulated for Piedmont allergens. Treatment starts at $47/month. No needles, no clinic visits, no waitlist.
