
Norway maple
Acer platanoides
Low today, mostly grass pollen.
Last updated July 9, 2026
Grass pollen is the main source of activity in Renton today, sitting at a low level. Most people should get through the day without much trouble, though those who are particularly sensitive to grass may notice mild symptoms, especially if spending extended time outdoors. Tree pollen is absent right now, so there is no meaningful contribution from that source at the moment. Looking ahead, grass pollen is expected to ease slightly and hold at a low level over the next several days, making for fairly comfortable conditions through the week. Tree pollen should stay quiet as well, which fits the season, since the main flowering period for local trees like oak, mountain ash, lilac, hornbeam, and serviceberry has already passed. With summer underway, grass remains the pollen type most worth keeping an eye on, while ragweed and other late-season weeds typically won't factor in until later in the year.
Every dot is a tree near Renton, 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 Renton. Each bar is that genus's share of the tree pollen.
237 pollen-relevant trees nearby drive today's tree-pollen reading.
Get to know the tree types growing around Renton: what each looks like, how allergenic it is, and when it blooms.

Norway maple
Acer platanoides

Red maple
Acer rubrum

Littleleaf linden
Tilia cordata

Red oak
Quercus rubra

Thundercloud purpleleaf plum
Prunus cerasifera

Sweetgum
Liquidambar styraciflua

(european) white birch
Betula pendula

Sugar maple
Acer saccharum

Kwanzan flowering cherry
Prunus L.

Sycamore maple
Acer pseudoplatanus

Callery pear
Pyrus calleryana

Purpleleaf plum variety
Prunus cerasifera

(smooth) japanese maple
Acer palmatum

Willow oak
Quercus phellos

Double chinese cherry
Prunus serrulata

Crimean linden
Tilia euchlora