Arkansas Allergy Season: The Natural State Breathes Its Forest

The Arkansas allergy season is what happens when a heavily forested state sits at the crossroads of the South and the plains. Arkansas calls itself the Natural State, and its pollen calendar reads like a census of that nature: eastern redcedar stirring in the Ozark winter, oak and hickory flooding the spring, Bermuda grass holding the summer, and ragweed rising from every river bottom and field edge in the fall. Winters here are mild enough that mold never fully clocks out, so the quiet season is shorter than the map suggests.

Two highlands and two lowlands divide the work. The Ozarks and Ouachitas run cooler, more elevated calendars in the north and west; the Arkansas River valley and the Mississippi Delta lowlands run warmer, longer ones. The sequence is the same everywhere — trees, grass, weeds — but the emphasis shifts with every hundred feet of elevation and every mile toward the big rivers.

Key takeaways

• Arkansas runs three full pollen acts: a tree spring from late February to May, a Bermuda-led grass summer, and a ragweed fall from late August to the first frost.
• Eastern redcedar opens the year in the Ozarks, pollinating in late winter while the hardwoods are still bare — a head start many residents mistake for a cold.
• Oak and hickory dominate the spring peak statewide, and the state's certified counting stations sit in Little Rock and Fort Smith.
• The Asthma and Allergy Foundation of America's 2025 Allergy Capitals list placed Little Rock sixth in the nation and Fayetteville also in the top forty, on pollen, medicine use and specialist measures combined.

Arkansas allergy season in a forested crossroads

Arkansas's spring belongs to its trees, and the roster is deep: oak, hickory, walnut, willow, ash, mulberry and maple, with pine adding its visible yellow dust. The University of Arkansas System Division of Agriculture Extension describes the mechanism plainly — the state's wind-pollinated trees, from cedars and oaks to hickories, release the fine pollen that finds its way into eyes and noses each spring, while showy, insect-pollinated flowers contribute almost nothing. Post oak catkins alone release millions of grains per tree, and Arkansas has oaks the way other states have suburbs.

The season's first note, though, is cedar. Eastern redcedar — a juniper, despite the name — blankets Ozark hillsides, old fields and limestone glades, and it pollinates in late winter, weeks before the hardwoods. In the northwest, a still February morning can carry visible cedar pollen off the ridges. That early start is one reason Arkansas's allergy year feels longer than its official spring: for cedar-sensitive residents, the season opens while the calendar still says winter.

Elevation sorts the rest. The Boston Mountains and the higher Ozark plateaus run a week or two behind the river valleys; the Ouachitas south of the Arkansas River run their own oak-pine version; and the Delta flatlands in the east, lowest and warmest, start earliest of all.

Grass, river bottoms and the ragweed fall

Summer hands the state to grass. Bermuda grass — lawns, pastures, roadsides, athletic fields — leads from late spring through the heat, joined by fescue in the cooler northwest, ryegrass, timothy and orchard grass in pastures statewide. Arkansas's long, humid growing season lets that grass act run for months rather than weeks, and the same humidity keeps mold woven through it, rising off river bottoms, shaded hollows and leaf litter even in winter thaws.

Fall belongs to the bottoms. Ragweed colonizes the disturbed ground Arkansas has in abundance — Arkansas River floodplain fields, Delta farm margins, rail and road edges — and from late August it produces the state's second great peak, running until frost. Marsh elder and other bottomland weeds join along the wettest ground. The National Allergy Bureau network's Arkansas counting stations, historically in Little Rock and Fort Smith, have recorded that double-peaked shape — hardwood spring, ragweed fall — as the state's signature, a pattern it shares with the river states around it, as our guides to the Louisiana allergy season and the Oklahoma allergy season show from opposite borders.

Pollen in Arkansas's major cities

Four cities, four terrains — the state's calendar bends noticeably from one to the next.

Little Rock

Little Rock straddles the Arkansas River where the Ouachita foothills meet the coastal plain, and it gets both regions' pollen: oak, pine and hickory off the wooded ridges from February into May, then Bermuda and bluegrass through summer, then a ragweed fall fed by floodplain fields up and down the river. The capital's combination of forest, river humidity and bottomland weeds is exactly the profile that pushed it to sixth on the Asthma and Allergy Foundation of America's 2025 Allergy Capitals list. One of the state's two longtime certified counting stations sits here.

Fayetteville

Fayetteville, in the Boston Mountain foothills of the northwest, runs the Ozark calendar: eastern redcedar off the surrounding ridges in late winter — the city's earliest and most distinctive pollen — then oak, hickory, maple and walnut through spring. Elevation trims the summer slightly, but Bermuda, fescue and ryegrass still carry it, and fall brings ragweed, marsh elder and sagebrush-family weeds off the plateau pastures. Fayetteville's own appearance in the Allergy Capitals top forty reflects how completely the Ozark forest surrounds the metro.

Fort Smith

Fort Smith sits on the Arkansas River at the Oklahoma line, in a broad valley where plains air meets Ozark and Ouachita pollen from both sides. Its spring stacks cedar and juniper early, then oak, hickory and walnut; its summer runs on Bermuda and pasture grasses; its fall is river-bottom ragweed at full strength. The city hosts the state's other longtime certified counting station, run as a service by a local allergy clinic — fitting for a valley that samples three regions at once.

Hot Springs

Hot Springs is tucked into a zigzag of Ouachita ridges, and its season is the mountain version of the state's calendar: oak and pine forest pressing close on every slope, pollen draining into the valley streets on still mornings, and a spring that starts a little later than Little Rock's, an hour west. The surrounding national forest keeps tree pollen dominant well into spring, lake and stream humidity sustains summer mold, and ragweed fills the cleared valleys in fall.

None of these cities yet has a dedicated page here; the nearest tracked metros ring the state — the Memphis pollen count just across the Mississippi shares the Delta's river-bottom pattern, the Oklahoma City pollen count to the west shows the plains version of Fort Smith's valley mix, and the Dallas pollen count to the southwest runs a warmer, cedar-heavy calendar that southwest Arkansas most resembles.

Arkansas allergy season through the year

The year's shape: redcedar from late winter in the highlands; the oak-hickory hardwood wave from late February through May, peaking as the canopy greens; Bermuda and pasture grasses from May through the summer heat; ragweed and bottomland weeds from late August until the first hard frost, usually in November; mold present in every month the rivers run humid, which is most of them.

Pollen Atlas data shows Arkansas's cities oscillating between the Moderate and High bands for much of the year, dipping toward Low mainly in the deepest winter weeks rather than enjoying a true off-season. On the city rankings, that persistence — two peaks and a long grass bridge between them — is what keeps the state's metros in the table's demanding half. This article is general information only and is not medical advice.

Frequently Asked Questions

When is allergy season in Arkansas?

Nearly year-round, with three peaks. Cedar starts in late winter, oak and hickory peak in spring, Bermuda grass carries summer, and ragweed runs from late August to the first frost. Only the coldest winter weeks offer a consistent lull, and mold can fill even those in the river valleys.

Why do symptoms start in February, before spring?

Eastern redcedar is the usual reason. The juniper that covers Ozark hillsides and old fields pollinates in late winter, well before the hardwoods, so cedar-sensitive residents get a head start on the season while the trees still look bare.

Why did Little Rock rank so high for allergies?

The Asthma and Allergy Foundation of America's 2025 Allergy Capitals report placed Little Rock sixth nationally, scoring tree, grass and weed pollen alongside medicine use and specialist availability. The city's river-valley setting — forested ridges above, ragweed bottomlands below — produces all three pollen types in strength.

How do the Ozarks differ from the Delta?

Elevation and timing. The Ozarks run cooler and later for hardwoods but add the late-winter cedar season; the Delta lowlands start earliest, lean hardest into warm-season grasses and farm-edge ragweed, and carry bottomland mold through more of the year.

Arkansas allergy season, in short

Cedar smoke over February ridges, an oak-and-hickory spring, a Bermuda summer and ragweed rising off the river bottoms: Arkansas runs the full southern calendar with a highland accent, and each of its regions stresses a different act. Daily readings and outlooks for Little Rock, Fayetteville and cities in every state are posted free at PollenAtlas.com. Should your Arkansas seasons keep arriving earlier or hitting harder than the calendar promises, you can find an allergist in the directory, sorted by specialty and the plans they take.