Grass Pollen Count in Ontario, OR — Today

Pollen by type in Ontario

• Ontario tree pollen count
• Ontario ragweed pollen count
• Ontario pollen count

What is the grass pollen count in Ontario today?

The Ontario grass pollen index today is 0.6 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

Ontario’s overall pollen count today is 25 (Low) across all types. See the full Ontario pollen count for the overall index and every type together.

Ontario is a city in Malheur County, Oregon. Its population is 11,728 (ACS 2023).

Ontario Grass Pollen Count: 5-Day Forecast

Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows Ontario’s overall trend across the week. Today’s grass pollen reading is the headline above.

Species driving Ontario’s grass pollen

The modelled data reports grass as one combined index — there is no species-by-species split for grass anywhere in the data, so this page does not invent one. Today’s modelled grass index for Ontario is 0.6 (Low), and the 5-day overall trend above shows the shape of the week.

As regional context only — not as today’s readings — in the Pacific Northwest pattern, the plants that typically shape this city’s year are spring trees and late-spring grasses in the Pacific Northwest pattern.

The Oregon allergy season guide singles out alder and hazelnut early, then the Willamette Valley’s seed grasses.

Plants affecting Ontario now — grass pollen

Detailed plant-by-plant readings for the grass pollen category were not returned in today’s source data for Ontario. The type summary stands: grass pollen reads 0.6 (Low) today.

In the Pacific Northwest pattern, the plants that typically shape this city’s year are spring trees and late-spring grasses in the Pacific Northwest pattern — named here as regional context only, not as today’s readings.

Plant detail returns here automatically on any day the feed includes it.

What this grass pollen level means

Low risk. Keep windows open; consider allergy meds only if sensitive.

Enjoy outdoor activities.

Grasses run from May, peaking in late spring and early summer. This month sits outside the usual grass pollen window for the Pacific Northwest pattern, so today’s grass pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. The Oregon allergy season guide singles out alder and hazelnut early, then the Willamette Valley’s seed grasses.

Ontario allergies today

Ontario allergies today are set by the same reading as the Ontario pollen count today: the Total Pollen Index is 25 (Low), and the grass pollen index on this page is 0.6 (Low) of it. When people ask about Ontario allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Ontario.

Allergies in Ontario follow the Oregon calendar set out on the full Ontario page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in Ontario before heading outdoors, the grass pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.

Read the five-day overall trend above as the Ontario allergy forecast for the grass pollen season: it shows whether Ontario allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.