When is pollen worst in Pima?

Tree pollen jumps the gun in Pima, opening as early as Jan–Apr while colder regions are still dormant. Grass follows Mar–Jun and ragweed closes the year Aug–Oct. The early tree start is the trap — symptoms can begin before you expect them. Currently, grass pollen is what's driving counts this month.

What's in the air in Pima right now?

Right now grass pollen leads in Pima at a Low (2/5) level. The species actually in the air today: Grasses. On a quiet live day, Pima's seasonal calendar fills in what's typically airborne this time of year.

Is tree or grass pollen higher in Pima in spring?

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

Pima sits in the arid Southwest desert zone, which means an early tree season and a comparatively light, short ragweed season — the dry desert air suppresses the weed load that hammers wetter regions. That shapes when symptoms hit and which allergen to watch.

How do I reduce pollen exposure in Pima?

Through Pima's peak windows (tree Jan–Apr, grass Mar–Jun, ragweed Aug–Oct), 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.

What pollen index counts as high?

Pollen is reported on a categorical scale — None, Low, Moderate, High, and Very High. "High" and above means most allergy sufferers notice symptoms even with brief outdoor exposure, and sensitized people should limit time outside and pre-medicate. "Low" to "Moderate" usually only affects highly sensitive individuals.

Pima, Arizona Pollen Count

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

Pima, AZ · Pollen count right now

Grass pollen is Low in Pima today

Grass: Low 2/5Tomorrow: Low

Today’s pollen by type

TreeOut of season
GrassLow2/5
Weed / RagweedOut of season

Active now: Grasses.

Pima pollen calendar

Typical peak months for each pollen type in this climate region. The highlighted column is the current month.

JFMAMJJASOND

TreeJan–Apr

GrassMar–Jun

WeedAug–Oct

How Pima’s pollen count works

The calendar above is tuned to Pima’s arid Southwest desert climate, not a national average: tree pollen peaks Jan–Apr, grass Mar–Jun, and ragweed Aug–Oct here. Those windows are why grass pollen is the one in season in Pima right now.

Right now grass pollen leads in Pima at a Low (2/5) level. The species actually in the air today: Grasses. Counts run highest on warm, dry, windy mornings and drop after rain, which washes pollen out of the air — reported on the None / Low / Moderate / High / Very High scale.

Frequently asked

When is pollen worst in Pima?: Tree pollen jumps the gun in Pima, opening as early as Jan–Apr while colder regions are still dormant. Grass follows Mar–Jun and ragweed closes the year Aug–Oct. The early tree start is the trap — symptoms can begin before you expect them. Currently, grass pollen is what's driving counts this month.
What's in the air in Pima right now?: Right now grass pollen leads in Pima at a Low (2/5) level. The species actually in the air today: Grasses. On a quiet live day, Pima's seasonal calendar fills in what's typically airborne this time of year.
Is tree or grass pollen higher in Pima in spring?: In spring, tree pollen leads in Pima — trees pollinate Jan–Apr, ahead of grass (Mar–Jun). 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 Pima's pollen season distinctive?: Pima sits in the arid Southwest desert zone, which means an early tree season and a comparatively light, short ragweed season — the dry desert air suppresses the weed load that hammers wetter regions. That shapes when symptoms hit and which allergen to watch.
How do I reduce pollen exposure in Pima?: Through Pima's peak windows (tree Jan–Apr, grass Mar–Jun, ragweed Aug–Oct), 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.
What pollen index counts as high?: Pollen is reported on a categorical scale — None, Low, Moderate, High, and Very High. "High" and above means most allergy sufferers notice symptoms even with brief outdoor exposure, and sensitized people should limit time outside and pre-medicate. "Low" to "Moderate" usually only affects highly sensitive individuals.

More for Pima

See the full Pima, AZ weather forecast — hour-by-hour outlook, NOAA radar, satellite, and air quality.

Today’s pollen by type

Pima pollen calendar

How Pima’s pollen count works

Frequently asked

More for Pima

Pollen counts nearby in Arizona