Tree Pollen Count in Hamilton, WA

Last updated Friday, November 6, 2026

This page shows the most recent reading available for Hamilton — from Friday, November 6, 2026 (1 day ago) — not today's reading.

Pollen by type in Hamilton

What is the tree pollen count in Hamilton today?

The Hamilton tree pollen index today is 3 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

Hamilton’s overall pollen count today is 7 (Low) across all types. See the full Hamilton pollen count for the overall index and every type together.

Hamilton Tree Pollen Count: 5-Day Forecast

DayOverall indexCategory
Friday, November 67Low
Saturday, November 77Low
Sunday, November 87Low
Monday, November 914Low
Tuesday, November 108Low

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 Hamilton’s overall trend across the week. Today’s tree pollen reading is the headline above.

Species driving Hamilton’s tree pollen

Species-level counts are not part of the modelled data Pollen Atlas publishes — the modelled index is reported per pollen type, not per species — so this section gives the type summary: tree pollen reads 3 (Low) today. The plant-by-plant detail that is available, from the Google Pollen API, is in the next section.

Plants affecting Hamilton now — tree pollen

Detailed plant-by-plant readings for the tree pollen category were not returned in today’s source data for Hamilton. The type summary stands: tree pollen reads 3 (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 tree pollen level means

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

Enjoy outdoor activities.

Alder and hazelnut can start in January west of the Cascades, with maple and oak following through April and May. This month sits outside the usual tree pollen window for the Pacific Northwest pattern, so today’s tree pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. The Washington allergy season guide singles out alder and hazelnut from January on the west side, and timothy and sagebrush on Spokane’s continental clock.

Hamilton allergies today

Hamilton allergies today are set by the same reading as the Hamilton pollen count today: the Total Pollen Index is 7 (Low), and the tree pollen index on this page is 3 (Low) of it. When people ask about Hamilton allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Hamilton.

Allergies in Hamilton follow the Washington calendar set out on the full Hamilton 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 Hamilton before heading outdoors, the tree 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 Hamilton allergy forecast for the tree pollen season: it shows whether Hamilton 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.

See the full Hamilton pollen count — all types, the overall index and today’s ranking context

Hamilton grass pollen count

Hamilton ragweed pollen count

See how Hamilton ranks in today's pollen count rankings — the worst cities for allergies today

See Hamilton on the pollen map

Every pollen type, with photos and seasons: the pollen directory

Washington allergy season guide

Tree pollen season

Find an allergist in Hamilton, WA

Pollen indexes: a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data. Plant detail: Google Pollen API. Index values are modelled, not measured counts. Sources: CDC/NAB; USA-NPN; GBIF (CC BY); ESA WorldCover (CC BY 4.0).