Hermiston, OR Pollen Count
Hermiston, OR · Last updated Friday, November 6, 2026
This page shows the most recent reading available for Hermiston — from Friday, November 6, 2026 (1 day ago) — not today's reading.
Pollen Overview
Today's overall pollen level and the dominant type (trees, weeds, grass, or mold).
Total Pollen Index
The combined pollen level across all types (0–100).
Hermiston, OR
Weeds Index
How active weeds pollen is today (0–100).
Hermiston, OR
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Hermiston Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Hermiston residents check each morning
The Hermiston pollen count today is 24 (Low). The main driver is Ragweed, with weed pollen at 31 today. The full split is tree pollen 6, grass pollen 0.6, weed pollen 31. The sections below break that headline number down by plant, by day and by what the band means in practice. Pollen Atlas updated this count on Friday, November 6, 2026.
A Low band on the Pollen Atlas index means the Total Pollen Index has stayed in the lower part of the 0–100 scale. Readings in this band are built from low individual category values rather than from one large spike, and the category split above matters more than the headline number: a low total can still contain one category, such as weed pollen or mold, reading noticeably higher than the rest, which is why the split is printed on every Hermiston page.
In the Pacific Northwest, the main outdoor pollen activity is concentrated in spring and early summer — trees first, then grasses — and readings outside that window are commonly low across every category. Cool-season pages in this region are therefore often defined by what is absent: zero or near-zero tree and grass values, with any remaining total carried by small weed or mold readings. That quiet pattern is itself useful information, and it is reported here exactly as modelled.
To see whether today’s pollen level holds, check the 5-day Hermiston pollen forecast below — it is currently holding, with Friday the highest day in the window.
This is the pollen count Hermiston residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Hermiston pollen count today?
The Hermiston pollen count today is 24 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Hermiston: this page is updated every morning with the day’s modelled reading.
Hermiston allergies today
Hermiston allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 24 (Low), driven mainly by Ragweed. When people ask about Hermiston allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Hermiston.
Allergies in Hermiston follow the Oregon calendar set out below — the chapters, the plants behind them, and the 5-day forecast on this page show whether today is typical for the season or an exception to it. If you are checking allergies today in Hermiston before heading outdoors, the split at the top of this page is the part to read: it shows which pollen is doing the work today, not just how high the total sits.
Read the five-day table on this page as the Hermiston allergy forecast: today reads 24 (Low), and the day-by-day outlook shows whether Hermiston allergies are set to ease or build across the week — the days to plan outdoor time around are the ones where the index steps down, not just today.
In practice, the allergy count Hermiston today records is this same combined reading — tree, grass, weed and mold in one index.
The Hermiston allergy count today is 24 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Hermiston: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 24 | Low |
| Saturday, November 7 | 24 | Low |
| Sunday, November 8 | 24 | Low |
| Monday, November 9 | 24 | Low |
| Tuesday, November 10 | 21 | Low |
Pollen Atlas forecasts Hermiston’s pollen count to peak on Friday at 24 (Low) over the next 5 days.
Pollen by type in Hermiston
What is driving Hermiston’s pollen today
The shape of today’s 24 (Low) is set by weed pollen at 31 (Low on its own scale) — about 82% of the four category readings added together, 25 points clear of the next category, tree pollen at 6. A weed-led total is the classic late-year shape: tree and grass pollen have usually receded, leaving weed pollen — and on damp days mold — to make up most of what the index records. Weed pollen leading in November runs against the usual calendar — the Oregon weed chapter runs August to September — so today’s lead is the model outranking the pattern, and this page reports the modelled reading first.
Plant-level detail is not in today’s feed for Hermiston, so the drivers have to be read from the category split above. The Oregon guide’s account of Oregon names alder and hazelnut early, then the Willamette Valley’s seed grasses — the pollens behind readings of this shape in this state — and the split shows how much of today’s total each category is actually carrying.
Across the five-day window the Total Pollen Index runs from 21 to 24, never changing band. Today’s 24 sits 1 point above the window’s average of 23.4 — a steady window, in which one day reads much like the next.
Plants affecting Hermiston now
Detailed plant-by-plant readings for Hermiston were not returned in today\u2019s source data, so this section summarises the pollen types the index above is built from instead of listing individual plants.
Tree pollen is one of the categories with a non-zero reading today, at 6 (Low).
Grass pollen is one of the categories with a non-zero reading today, at 0.6 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 31 (Low).
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\u2019s measurements.
Plant detail returns here automatically on any day the source data includes it.
Every pollen type, with photos and seasons: the pollen directory.
Hermiston pollen through the year
The Hermiston pollen year runs in chapters, set by the Pacific Northwest pattern and the Oregon calendar. Trees come first: alder and hazelnut can start in January west of the Cascades, with maple and oak following through April and May. Grasses take the middle of the year: grasses run from May, peaking in late spring and early summer. Weeds close it out: weeds are the minor act — sagebrush and tumbleweed east of the Cascades carry into September. Mold is the wet-season constant west of the Cascades, where rain crashes counts and the season restarts on the first dry, mild day.
The Oregon allergy season guide names alder and hazelnut early, then the Willamette Valley’s seed grasses. The Willamette Valley grows almost two-thirds of the United States’ cool-season grass seed, and its grass peak ends when the mid-summer harvest cuts the fields and removes the source. East of the Cascades, western juniper’s late-winter-to-spring pollen opens a shorter, compressed high-desert season.
November falls between the main chapters of the Oregon pollen year — the tail of one and the approach of the next — so the calendar alone explains little today, and the modelled split above carries the story. Between them, the three chapters cover 9 months of the Oregon year, January to September — leaving a quiet gap of roughly 3 months in the depth of the off-season. The full calendar is set out in the Oregon allergy season guide.
How to read this index
Pollen Atlas reports the Hermiston pollen count on a Total Pollen Index from 0 to 100, built from separate tree, grass and weed readings. The total is a summary, not an average of the three: a single strong category can lift it, and three quiet categories can hold it down whatever the month. Index values are a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data, with plant detail by the Google Pollen API. The index is a modelled 0–100 scale, not a measured count, and figures update through the day, so a morning and an evening visit to this page can legitimately show different numbers.
Hermiston in today’s national picture
At 24 (Low), Hermiston ranks joint 39349th of the 90896 cities Pollen Atlas tracks today — in the middle of the national table. The highest reading in the country today is Serpa, Portugal at 53, and the lowest is Galiakberovo, Russia at 5. The whole table spans 48 points today — a wide-open day, when the top and bottom of the table are effectively in different seasons.
Around Hermiston: Stanfield, OR (5 miles away) reads 28 (Low); Umatilla, OR (6 miles away) reads 22 (Low); Echo, OR (7 miles away) reads 29 (Low). Hermiston reads 4 points lower than its nearest tracked neighbour today. Across Oregon’s 426 tracked cities, today runs from 5 in Bend to 31 in Woodburn.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Hermiston resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Hermiston, OR can test whether tree, grass, weed or mold is the category that matters for you — the four readings at the top of this page are the starting point for that conversation.
Hermiston in its local area
Hermiston is a city in Umatilla County, Oregon. Its population is 19,406 (ACS 2023).
Across Oregon’s 426 tracked cities, Hermiston ranks joint 67th today.
Like every Pollen Atlas city page, the Hermiston, OR pollen count is refreshed each morning.
Nearby cities
- Stanfield pollen count (5 miles away)
- Umatilla pollen count (6 miles away)
- Echo pollen count (7 miles away)
- Irrigon pollen count (11 miles away)
- Boardman pollen count (20 miles away)
- Pendleton pollen count (25 miles away)
From Pollen Atlas News
See how Hermiston ranks in today's pollen count rankings — the worst cities for allergies today
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).