Moderate Pollen in Rancho Cucamonga, CA

About pollen in Rancho Cucamonga

Weeds are the main source of pollen in Rancho Cucamonga today, sitting at a moderate level that could be noticeable for those who tend to react to this time of year. Tree pollen is absent, and grass is present only in trace amounts, so most sensitivity right now traces back to weeds rather than blooming trees. Looking ahead, this pattern should hold steady through the next several days, with weed pollen remaining moderate and grass staying at a very low, background level. Tree pollen isn't expected to factor in, which fits the season, since local varieties like Lagerstroemia, Koelreuteria, Cercis, Citrus, and Washingtonia typically release their pollen earlier in the year. Late September aligns with the usual weed pollen stretch, so if you're sensitive to ragweed and similar plants, this is a normal time to notice some effect.

What to do today

• It's important to shower and wash your hair after spending a lot of time outdoors.
• When spending time outside, use sunglasses and a cap to keep pollen out of your face and eyes.
• Wash clothes worn outdoors to remove any remnants of pollen grains.
• If possible, wear glasses instead of contact lenses.
• Did you hang any laundry outside? Now is a good time to hang clothes indoors or use a dryer if possible.

Tree map

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

Top tree-pollen sources

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

Meet the trees near you

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

London plane

Platanus acerifolia

Allergenicity 4/4Blooms spring

Canary island pine

Pinus canariensis

Allergenicity 1/4Blooms spring

American sweetgum

Liquidambar styraciflua

Allergenicity 2/4Blooms spring

Glossy privet

Ligustrum lucidum

Allergenicity 2/4Blooms spring

Leaf plum purple

Prunus cerasifera

Allergenicity 1/4Blooms spring

Ornamental pear

Pyrus calleryana

Allergenicity 1/4Blooms spring

Evergreen pear

Pyrus kawakamii

Allergenicity 1/4Blooms spring

Tulip tree

Liriodendron tulipifera

Allergenicity 1/4Blooms spring

Aleppo pine

Pinus halepensis

Allergenicity 1/4Blooms spring

Chinese elm

Ulmus parvifolia

Allergenicity 3/4Blooms spring

White alder

Alnus rhombifolia

Allergenicity 4/4Blooms winter,spring

Holly oak

Quercus ilex

Allergenicity 4/4Blooms spring

Italian stone pine

Pinus pinea

Allergenicity 1/4Blooms spring

Arizona ash

Fraxinus velutina

Allergenicity 4/4Blooms spring

Purple robe locust

Robinia pseudoacacia

Allergenicity 2/4Blooms spring

White mulberry

Morus alba

Allergenicity 5/4Blooms spring

Common questions

What is the pollen count in Rancho Cucamonga, CA today?

Rancho Cucamonga, CA is at a moderate 3 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. The five-day outlook holds steady around 3 of 5.

Is weed pollen high in Rancho Cucamonga, CA right now?

Weed pollen is moderate today at 3 of 5, and it's in season now. Sensitive people may notice symptoms.

What plants are causing allergies in Rancho Cucamonga, CA?

The main sources right now are Lagerstroemia, Koelreuteria, Cercis, Citrus, and Washingtonia. Ragweed (Asteraceae (the daisy family), Late summer, fall) is actively pollinating.