When is pollen worst in Killeen?

The late-summer ragweed run is the headline in Killeen: weed pollen peaks Aug–Nov, the longest and most punishing window of the year here. Tree pollen comes first (Dec–Apr) and grass bridges the gap (Apr–Sep), but it's the ragweed stretch that floors most sufferers. Currently, grass and ragweed pollen are in season.

What's in the air in Killeen right now?

In September, grass and ragweed pollen are in season in Killeen — grass peaks Apr–Sep and ragweed peaks Aug–Nov. On Killeen's warm, humid subtropical Southeast calendar the typical September level is High, led by ragweed pollen — a seasonal estimate, not a live count.

Is tree or grass pollen higher in Killeen in spring?

In spring, tree pollen leads in Killeen — trees pollinate Dec–Apr, ahead of grass (Apr–Sep). The handoff is the tail of the tree window: tree counts taper as grass climbs, so an early-spring flare is more likely tree pollen and a late-spring one more likely grass.

What makes Killeen's pollen season distinctive?

Killeen sits in the warm, humid subtropical Southeast zone, which means an unusually long, overlapping season — the warm climate stretches grass across much of the year and pushes ragweed deep into autumn. That shapes when symptoms hit and which allergen to watch.

How do I reduce pollen exposure in Killeen?

Through Killeen's peak windows (tree Dec–Apr, grass Apr–Sep, ragweed Aug–Nov), keep windows shut and run AC on recirculate; counts run highest on dry, warm, windy mornings, so push outdoor activity to late afternoon or just after rain, which clears pollen from the air. A HEPA purifier indoors, a saline rinse after being outside, showering before bed, and starting antihistamines a week or two before your worst local window all measurably cut symptoms.

When does the next pollen season start in Killeen?

Tree pollen is next in Killeen: it opens around week 49 (early December), peaks around week 2, and runs about 152 days.

What is the allergy forecast in Killeen today?

With no live reading for Killeen today, its allergy forecast is the seasonal estimate above: a typical September level of High, led by ragweed pollen.

Killeen, Texas Pollen Count & Allergy Forecast

Killeen pollen count and allergy forecast — tree, grass, and ragweed seasons and what’s pollinating now

Killeen, TX · Pollen season

In September, grass and ragweed pollen are in season in Killeen — grass peaks Apr–Sep and ragweed peaks Aug–Nov.

Based on the seasonal pollen calendar for this region.

Killeen on the WeatherStory Allergy Index

Killeen isn't one of the 100 metros on the WeatherStory Allergy Index, but the nearest ranked metro — Austin, TX, about 54 miles away — sits at #5 with a 365-day combined pollen season.

#5of 100nearest ranked metro

Load index: 50
Combined season: 365 days
Heaviest load: Tree · 152 days
Nearest ranked metro: Austin, TX · ~54 mi

See the full 100 worst U.S. cities for pollen — a modeled seasonal load ranking (see methodology).

Typical now — Septemberseasonal estimate, not a live reading

Ragweed pollen typically leads in Killeen in September, at an estimated High level.

Pollen by type this season

TreeOut of seasonpeaks Dec–Apr
GrassIn seasonpeaks Apr–Sep
Weed / RagweedIn seasonpeaks Aug–Nov

What pollinates near Killeen

The tree, grass, and weed species that drive Killeen’s pollen seasons, with each plant’s typical peak.

Trees

Mountain cedar (Ashe juniper) Juniperus asheipeaks December–February
Oak Quercuspeaks March–April
Loblolly pine Pinus taedapeaks March–April
Pecan Carya illinoinensispeaks April–May
Sweetgum Liquidambar styracifluapeaks March–April
Mulberry Moruspeaks March–April
Elm Ulmuspeaks February–March

Grasses

Bermuda grass Cynodon dactylonpeaks May–September
Bahia grass Paspalum notatumpeaks May–September
Johnson grass Sorghum halepensepeaks June–August
Timothy Phleum pratensepeaks May–June

Weeds

Common ragweed Ambrosia artemisiifoliapeaks August–October
Giant ragweed Ambrosia trifidapeaks August–October
Pigweed Amaranthuspeaks August–September
English plantain Plantago lanceolatapeaks May–September

Species are the region’s common wind-pollinated plants; peak months are a seasonal estimate, not a measured count — see methodology.

Killeen’s allergy year

Typical month-by-month pollen intensity for Killeen, tuned to its latitude and climate region — darker means higher typical counts. The highlighted column is the current month.

JFMAMJJASOND

TreeDec–Apr

GrassApr–Sep

RagweedAug–Nov

How Killeen compares to the U.S. average

Each colored bar is Killeen’s typical season against the national-average window (grey). The offset is the per-city timing shift.

Tree~6 wks earlier

Grass~6 wks earlier

Ragweedabout average

“U.S. average” is the textbook tree Mar–May, grass May–Jul, ragweed Aug–Oct calendar. The shift is a phenology estimate (Hopkins’ bioclimatic law), not a measured count — see methodology.

How Killeen’s pollen count works

The calendar above is tuned to Killeen’s warm, humid subtropical Southeast climate, not a national average: tree pollen runs from week 49 (early December) to week 17 (late April), grass from week 14 (early April) to week 39 (late September), and ragweed from week 31 (early August) to week 48 (late November) here — a 365-day combined pollen season. Those windows are why grass and ragweed pollen are in season in Killeen right now.

Killeen also runs the winter tree season most of the country never sees: mountain cedar (Ashe juniper, Juniperus ashei) releases pollen from mid-December through February, peaking in mid-January and often set off by a cold front. The reaction is known locally as cedar fever, and it is why the tree window above opens in December here. The numbers stay modeled, not measured — see the cedar fever guide for the counts, the symptoms, and the sources.

No live count is wired up for Killeen today, so the seasonal calendar above is your guide to which allergen is in season.

For the science behind Killeen’s pollen seasons — how counts are measured, when each type peaks, and what the numbers mean — see the pollen count scale and the other pollen & allergy guides.

Frequently asked

When is pollen worst in Killeen?: The late-summer ragweed run is the headline in Killeen: weed pollen peaks Aug–Nov, the longest and most punishing window of the year here. Tree pollen comes first (Dec–Apr) and grass bridges the gap (Apr–Sep), but it's the ragweed stretch that floors most sufferers. Currently, grass and ragweed pollen are in season.
What's in the air in Killeen right now?: In September, grass and ragweed pollen are in season in Killeen — grass peaks Apr–Sep and ragweed peaks Aug–Nov. On Killeen's warm, humid subtropical Southeast calendar the typical September level is High, led by ragweed pollen — a seasonal estimate, not a live count.
Is tree or grass pollen higher in Killeen in spring?: In spring, tree pollen leads in Killeen — trees pollinate Dec–Apr, ahead of grass (Apr–Sep). The handoff is the tail of the tree window: tree counts taper as grass climbs, so an early-spring flare is more likely tree pollen and a late-spring one more likely grass.
What makes Killeen's pollen season distinctive?: Killeen sits in the warm, humid subtropical Southeast zone, which means an unusually long, overlapping season — the warm climate stretches grass across much of the year and pushes ragweed deep into autumn. That shapes when symptoms hit and which allergen to watch.
How do I reduce pollen exposure in Killeen?: Through Killeen's peak windows (tree Dec–Apr, grass Apr–Sep, ragweed Aug–Nov), keep windows shut and run AC on recirculate; counts run highest on dry, warm, windy mornings, so push outdoor activity to late afternoon or just after rain, which clears pollen from the air. A HEPA purifier indoors, a saline rinse after being outside, showering before bed, and starting antihistamines a week or two before your worst local window all measurably cut symptoms.
When does the next pollen season start in Killeen?: Tree pollen is next in Killeen: it opens around week 49 (early December), peaks around week 2, and runs about 152 days.
What is the allergy forecast in Killeen today?: With no live reading for Killeen today, its allergy forecast is the seasonal estimate above: a typical September level of High, led by ragweed pollen.