Alum Rock, CA Pollen Count Today
Alum Rock, CA · Updated Saturday, November 7, 2026
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).
Alum Rock, CA
Weeds Index
How active weeds pollen is today (0–100).
Alum Rock, CA
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Alum Rock Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Alum Rock residents check each morning
The Alum Rock pollen count today is 23 (Low). The main driver is Ragweed, with weed pollen at 24 today. Tree pollen is the highest single category in the split at 26 (Low), ahead of weed pollen at 24 and grass pollen at 1. Plant-by-plant detail for Alum Rock, CA follows, along with the outlook for the days ahead. Pollen Atlas updated this count on Saturday, November 7, 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 tree pollen, reading noticeably higher than the rest, which is why the split is printed on every Alum Rock page.
Fall is ragweed season across most of the United States: ragweed plants release pollen from late summer into autumn, and weed pollen is typically the last major outdoor pollen category to fade as the weather cools. That pattern is why an autumn total is so often weed-led even when the headline number is low — tree and grass pollen have usually receded by then, leaving weed pollen, and on damp days mold, to make up most of what the index records.
To see whether today’s pollen level holds, check the 5-day Alum Rock pollen forecast below — it is currently mixed, with Saturday the highest day in the window.
This is the pollen count Alum Rock residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Alum Rock pollen count today?
The Alum Rock pollen count today is 23 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Alum Rock: this page is updated every morning with the day’s modelled reading.
Alum Rock allergies today
Alum Rock allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 23 (Low), driven mainly by Ragweed. When people ask about Alum Rock allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Alum Rock.
Allergies in Alum Rock follow the California 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 Alum Rock 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 Alum Rock allergy forecast: today reads 23 (Low), and the day-by-day outlook shows whether Alum Rock 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 Alum Rock today records is this same combined reading — tree, grass, weed and mold in one index.
The Alum Rock allergy count today is 23 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Alum Rock: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 23 | Low |
| Sunday, November 8 | 22 | Low |
| Monday, November 9 | 23 | Low |
| Tuesday, November 10 | 20 | Low |
| Wednesday, November 11 | 20 | Low |
Pollen Atlas forecasts Alum Rock’s pollen count to peak on Saturday at 23 (Low) over the next 5 days.
Pollen by type in Alum Rock
What is driving Alum Rock’s pollen today
The shape of today’s 23 (Low) is set by tree pollen at 26 (Low on its own scale) — about 51% of the four category readings added together, 2 points clear of the next category, weed pollen at 24. Tree readings are the fastest-moving of the four in their season, because species pollinate in sequence — a tree-led total can change character within a week. Tree pollen leading in November runs against the usual calendar — the California tree chapter runs February to May — 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 Alum Rock, so the drivers have to be read from the category split above. The California guide’s account of California names planted olive and the Central Valley’s concentrated spring pollen — 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 20 to 23, never changing band. Today’s 23 sits 1 point above the window’s average of 21.6 — a steady window, in which one day reads much like the next.
Plants affecting Alum Rock now
Detailed plant-by-plant readings for Alum Rock 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 26 (Low).
Grass pollen is one of the categories with a non-zero reading today, at 1 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 24 (Low).
In the California pattern, the plants that typically shape this city’s year are winter and spring trees, late-spring grasses and late-summer weeds — 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.
Alum Rock pollen through the year
Chapter by chapter, the Alum Rock pollen year runs like this:
- Trees build through spring, with planted olive peaking from March into May.
- Grasses peak in spring in the Central Valley and run longer and milder on the coast.
- Weeds follow in late summer and fall, stronger after wet winters.
The California allergy season guide names planted olive and the Central Valley’s concentrated spring pollen. There is no single California season: the Central Valley records some of the state’s sharpest spring peaks, trapped and concentrated by valley geography, while the coast runs long and mild. The AAFA’s 2025 Allergy Capitals research noted upward movement for several California cities, attributed to grass and weed pollen after wet weather.
November falls between the main chapters of the California 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 California year, February to October — leaving a quiet gap of roughly 3 months in the depth of the off-season. The full calendar is set out in the California allergy season guide.
How to read this index
Pollen Atlas reports the Alum Rock 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 even in a month when Alum Rock, CA pollen is usually more active. 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.
Alum Rock in today’s national picture
At 23 (Low), Alum Rock ranks joint 40203rd of the 90896 cities Pollen Atlas tracks today — in the middle of the national table. The highest reading in the country today is Beja, Portugal at 52, and the lowest is Los Ángeles de San Rafael, Spain at 5. The whole table spans 47 points today — a wide-open day, when the top and bottom of the table are effectively in different seasons.
Around Alum Rock: East Foothills, CA (1 miles away) reads 23 (Low); San Jose, CA (4 miles away) reads 23 (Low); Milpitas, CA (6 miles away) reads 25 (Low). Alum Rock reads exactly level with its nearest tracked neighbour today. Across California’s 1602 tracked cities, today runs from 5 in Truckee to 42 in Mecca.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Alum Rock resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Alum Rock, CA 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.
Alum Rock in its local area
Alum Rock is a census-designated place in Santa Clara County, California. Its population is 11,619 (ACS 2023).
Across California’s 1602 tracked cities, Alum Rock ranks joint 585th today.
Like every Pollen Atlas city page, the Alum Rock, CA pollen count is refreshed each morning.
Nearby cities
- East Foothills pollen count (1 miles away)
- San Jose pollen count (4 miles away)
- Milpitas pollen count (6 miles away)
- Burbank pollen count (7 miles away)
- Fruitdale pollen count (7 miles away)
- Santa Clara pollen count (8 miles away)
From Pollen Atlas News
See how Alum Rock 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).