
Red maple
Acer rubrum
Very low today, mostly weed pollen.
Last updated September 30, 2026
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.
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.
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.
Get to know the tree types growing around Gresham: what each looks like, how allergenic it is, and when it blooms.

Red maple
Acer rubrum

Norway maple
Acer platanoides

Pear
Pyrus

Plum
Prunus

Cherry
Prunus

Deciduous oak
Quercus

Ash
Fraxinus

Birch
Betula

Japanese maple
Acer palmatum

Pine
Pinus

Sweetgum
Liquidambar

Other maple
Acer

Zelkova
Zelkova serrata

Linden
Tilia

Bigleaf maple
Acer macrophyllum

Paperbark maple
Acer griseum