Very Low Pollen in Gresham, OR

Very low today, mostly weed pollen.

Last updated September 30, 2026

Today's index1out of 5Very Low
TreeNone
WeedVery Lowoff-season

Driving it today

PseudotsugaPseudotsugaPrunusPrunusOakQuercusStyraxStyraxFagusFagus

Forecast

Thu
1
Fri
1
Sat
1
Sun
1

About pollen in Gresham

Pollen levels in Gresham are quiet today. Tree pollen is absent entirely, and weeds are registering only a very low presence, the kind that most people will not notice at all. Overall, this is an easy day for anyone who deals with seasonal allergies. Looking ahead, expect more of the same through the next several days, with weed pollen holding steady at a low level and tree pollen staying inactive. This fits the season well, as local trees such as Douglas fir, cherry and plum varieties, oak, Styrax, and beech have long finished their spring release and won't stir again until next year. Any lingering sensitivity right now is far more likely tied to the tail end of weed season than anything from the trees.

What to do today

  • Pollen levels are very low right now. It's a great day to enjoy the outdoors!

Tree map

Every dot is a tree near Gresham, colored by how allergenic it is. Click one for its details, and zoom in for a closer look.

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Top tree-pollen sources

The local tree genera behind today's pollen near Gresham. Each bar is that genus's share of the tree pollen.

476 pollen-relevant trees nearby drive today's tree-pollen reading.

Meet the trees near you

Get to know the tree types growing around Gresham: what each looks like, how allergenic it is, and when it blooms.

Red maple

Red maple

Acer rubrum

Allergenicity 3/4Blooms spring
Norway maple

Norway maple

Acer platanoides

Allergenicity 3/4Blooms spring
Pear

Pear

Pyrus

Allergenicity 1/4Blooms spring
Plum

Plum

Prunus

Allergenicity 1/4Blooms spring
Cherry

Cherry

Prunus

Allergenicity 1/4Blooms spring
Deciduous oak

Deciduous oak

Quercus

Allergenicity 4/4Blooms spring
Ash

Ash

Fraxinus

Allergenicity 4/4Blooms spring
Birch

Birch

Betula

Allergenicity 5/4Blooms spring
Japanese maple

Japanese maple

Acer palmatum

Allergenicity 3/4Blooms spring
Pine

Pine

Pinus

Allergenicity 1/4Blooms spring
Sweetgum

Sweetgum

Liquidambar

Allergenicity 2/4Blooms spring
Other maple

Other maple

Acer

Allergenicity 3/4Blooms spring
Zelkova

Zelkova

Zelkova serrata

Allergenicity 2/4Blooms spring
Linden

Linden

Tilia

Allergenicity 2/4Blooms summer
Bigleaf maple

Bigleaf maple

Acer macrophyllum

Allergenicity 3/4Blooms spring
Paperbark maple

Paperbark maple

Acer griseum

Allergenicity 3/4Blooms spring

Common questions

What is the pollen count in Gresham, OR today?
Gresham, OR is at a very low 1 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. The five-day outlook holds steady around 1 of 5.
Is weed pollen high in Gresham, OR right now?
Weed pollen is very low today at 1 of 5, and it's past its peak season. Most people won't notice it.
What plants are causing allergies in Gresham, OR?
The main sources right now are Pseudotsuga, Prunus, Oak, Styrax, and Fagus.