
Oak
Quercus
Low today, mostly weed pollen.
Last updated September 29, 2026
Weed pollen is the most active category in Santa Rosa today, though overall levels remain low across the board. Tree and grass pollen are both very light and unlikely to cause much trouble, while weed pollen is running slightly higher and may be noticeable to those who are especially sensitive. Looking ahead, this pattern should hold steady over the next several days, with weed pollen staying at a low level and grass and tree pollen continuing to sit at the low end as well. This lines up with the season: tree pollen typically peaks back in spring, grass pollen tends to run its course by early summer, and weeds like ragweed are the ones still active into early fall. Local trees such as oak, sequoia, and pine are largely dormant for pollen purposes this time of year, so weeds remain the main thing to keep an eye on for now.
Every dot is a tree near Santa Rosa, 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 Santa Rosa. Each bar is that genus's share of the tree pollen.
110 pollen-relevant trees nearby drive today's tree-pollen reading.
Get to know the tree types growing around Santa Rosa: what each looks like, how allergenic it is, and when it blooms.

Oak
Quercus

Maple
Acer

Sycamore
Platanus acerifolia

Pear
Pyrus

Pine
Pinus

Plum
Prunus

Hackberry
Celtis occidentalis

Willow
Salix

Walnut
Juglans

Alder
Alnus

Raywood ash
Fraxinus oxycarpa

Poplar
Populus

Sweetgum
Liquidambar styraciflua

Tree

Pistache

Redwood
Sequoia sempervirens