When is pollen worst in Anchorage?

Anchorage's season is short and front-loaded: a sharp tree burst Apr–Jun is the main event, grass is brief (Jun–Jul), and ragweed (Aug–Sep) is nearly an afterthought. Miss the spring tree window and you've largely missed the year. Currently, ragweed pollen is in season.

What's in the air in Anchorage right now?

In September, ragweed pollen is in season in Anchorage, peaking Aug–Sep. On Anchorage's subarctic Alaskan calendar the typical September level is Low, led by ragweed pollen — a seasonal estimate, not a live count.

Is tree or grass pollen higher in Anchorage in spring?

In spring, tree pollen leads in Anchorage — trees pollinate Apr–Jun, ahead of grass (Jun–Jul). 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 Anchorage's pollen season distinctive?

Anchorage sits in the subarctic Alaskan zone, which means a compressed, birch-driven calendar — the season is short and tree-dominated, with grass brief in midsummer and ragweed nearly absent. That shapes when symptoms hit and which allergen to watch.

How do I reduce pollen exposure in Anchorage?

Through Anchorage's peak windows (tree Apr–Jun, grass Jun–Jul, ragweed Aug–Sep), 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 Anchorage?

Tree pollen is next in Anchorage: it opens around week 14 (early April), peaks around week 20, and runs about 91 days.

What is the allergy forecast in Anchorage today?

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

Anchorage, Alaska Pollen Count & Allergy Forecast

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

Anchorage, AK · Pollen season

In September, ragweed pollen is in season in Anchorage, peaking Aug–Sep.

Based on the seasonal pollen calendar for this region.

Anchorage on the WeatherStory Allergy Index

Anchorage isn't one of the 100 metros on the WeatherStory Allergy Index, but the nearest ranked metro — Seattle, WA, about 1409 miles away — sits at #53 with a 274-day combined pollen season.

#53of 100nearest ranked metro

Load index: 30
Combined season: 274 days
Heaviest load: Tree · 122 days
Nearest ranked metro: Seattle, WA · ~1409 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 Anchorage in September, at an estimated Low level.

Pollen by type this season

TreeOut of seasonpeaks Apr–Jun
GrassOut of seasonpeaks Jun–Jul
Weed / RagweedIn seasonpeaks Aug–Sep

What pollinates near Anchorage

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

Trees

Paper birch Betula papyriferapeaks May–June
Alder Alnuspeaks April–May
Spruce Piceapeaks May–June
Poplar Populuspeaks May–June
Willow Salixpeaks May–June

Grasses

Bluejoint reedgrass Calamagrostis canadensispeaks June–July
Timothy Phleum pratensepeaks June–July
Kentucky bluegrass Poa pratensispeaks June–July
Fescue Festucapeaks June–July

Weeds

Fireweed Chamerion angustifoliumpeaks July–August
Lamb's quarters Chenopodium albumpeaks August–September
Plantain Plantagopeaks July–August
Sagewort Artemisiapeaks August–September

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

Anchorage’s allergy year

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

JFMAMJJASOND

TreeApr–Jun

GrassJun–Jul

RagweedAug–Sep

How Anchorage compares to the U.S. average

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

Tree~2 wks later

Grass~2 wks later

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 Anchorage’s pollen count works

The calendar above is tuned to Anchorage’s subarctic Alaskan climate, not a national average: tree pollen runs from week 14 (early April) to week 26 (late June), grass from week 23 (early June) to week 30 (late July), and ragweed from week 31 (early August) to week 39 (late September) here — a 183-day combined pollen season. Those windows are why ragweed pollen is the one in season in Anchorage right now.

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

For the science behind Anchorage’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 Anchorage?: Anchorage's season is short and front-loaded: a sharp tree burst Apr–Jun is the main event, grass is brief (Jun–Jul), and ragweed (Aug–Sep) is nearly an afterthought. Miss the spring tree window and you've largely missed the year. Currently, ragweed pollen is in season.
What's in the air in Anchorage right now?: In September, ragweed pollen is in season in Anchorage, peaking Aug–Sep. On Anchorage's subarctic Alaskan calendar the typical September level is Low, led by ragweed pollen — a seasonal estimate, not a live count.
Is tree or grass pollen higher in Anchorage in spring?: In spring, tree pollen leads in Anchorage — trees pollinate Apr–Jun, ahead of grass (Jun–Jul). 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 Anchorage's pollen season distinctive?: Anchorage sits in the subarctic Alaskan zone, which means a compressed, birch-driven calendar — the season is short and tree-dominated, with grass brief in midsummer and ragweed nearly absent. That shapes when symptoms hit and which allergen to watch.
How do I reduce pollen exposure in Anchorage?: Through Anchorage's peak windows (tree Apr–Jun, grass Jun–Jul, ragweed Aug–Sep), 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 Anchorage?: Tree pollen is next in Anchorage: it opens around week 14 (early April), peaks around week 20, and runs about 91 days.
What is the allergy forecast in Anchorage today?: With no live reading for Anchorage today, its allergy forecast is the seasonal estimate above: a typical September level of Low, led by ragweed pollen.