Derby, CT Pollen Count
Derby, CT · Last updated Friday, November 6, 2026
This page shows the most recent reading available for Derby — 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).
Derby, CT
Weeds Index
How active weeds pollen is today (0–100).
Derby, CT
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Derby Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Derby residents check each morning
The Derby pollen count today is 7 (Low). The main driver is Ragweed, with weed pollen at 9 today. Weed pollen leads the split at 9 (Low on its own scale), followed by tree pollen at 0.6 and grass pollen at 0.6. Below, the plant detail and the multi-day outlook show whether today is the pattern or the exception. 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 Derby 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. In the Northeast, autumn weed pollen typically winds down as colder nights arrive, so late-season totals can change quickly from week to week.
To see whether today’s pollen level holds, check the 5-day Derby pollen forecast below — it is currently mixed, with Saturday the highest day in the window.
This is the pollen count Derby residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Derby pollen count today?
The Derby pollen count today is 7 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Derby: this page is updated every morning with the day’s modelled reading.
Derby allergies today
Derby allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 7 (Low), driven mainly by Ragweed. When people ask about Derby allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Derby.
Allergies in Derby follow the Connecticut 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 Derby 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 Derby allergy forecast: today reads 7 (Low), and the day-by-day outlook shows whether Derby 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 Derby today records is this same combined reading — tree, grass, weed and mold in one index.
The Derby allergy count today is 7 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Derby: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 7 | Low |
| Saturday, November 7 | 16 | Low |
| Sunday, November 8 | 16 | Low |
| Monday, November 9 | 15 | Low |
| Tuesday, November 10 | 15 | Low |
Pollen Atlas forecasts Derby’s pollen count to peak on Saturday at 16 (Low) over the next 5 days.
Pollen by type in Derby
What is driving Derby’s pollen today
The shape of today’s 7 (Low) is set by weed pollen at 9 (Low on its own scale) — about 88% of the four category readings added together, 8.4 points clear of the next category, tree pollen at 0.6. 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 Connecticut weed chapter runs August to October — 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 Derby, so the drivers have to be read from the category split above. The Connecticut guide’s account of Connecticut names oak, the spring heavyweight peaking in May, with birch alongside — 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 7 to 16, never changing band. Today’s 7 sits 7 points below the window’s average of 13.8 — a moving window, worth reading day by day rather than from the average.
Plants affecting Derby now
Detailed plant-by-plant readings for Derby 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 0.6 (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 9 (Low).
In the Northeast pattern, the plants that typically shape this city’s year are spring trees, late-spring grasses and late-summer ragweed — 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.
Derby pollen through the year
Three chapters make the Connecticut pollen year, and Derby follows them in the Northeast order. The tree chapter: trees open in late March and build to an oak-led peak in May. The grass chapter: grasses hold from late May into July. The weed chapter: ragweed builds from mid-August, peaks in September, and is ended by the first hard frost. Mold tracks the region’s humidity rather than a flowering calendar, and it fills the gaps between chapters.
Connecticut’s season runs from late March to the first hard frost in three clear acts, and the Connecticut River Valley’s farm bottomlands give Hartford a fall ragweed peak to match its spring. The shore trades a little pollen relief from Sound breezes for elevated mold, while the northwest hills start latest and finish earliest. The Connecticut guide singles out oak, the spring heavyweight peaking in May, with birch alongside.
November falls between the main chapters of the Connecticut 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 8 months of the Connecticut year, March to October — a compressed season, which is why its chapters arrive in quick succession. The full calendar is set out in the Connecticut allergy season guide.
How to read this index
Pollen Atlas reports the Derby 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 Derby, CT 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.
Derby in today’s national picture
At 7 (Low), Derby ranks joint 83515th 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 Derby: Ansonia, CT (1 miles away) reads 7 (Low); Shelton, CT (3 miles away) reads 7 (Low); Orange, CT (4 miles away) reads 7 (Low). Derby reads exactly level with its nearest tracked neighbour today. Across Connecticut’s 215 tracked cities, today runs from 5 in Essex Village to 10 in Rockville.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Derby resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Derby, CT 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.
Derby in its local area
Derby is a city in Naugatuck Valley Planning Region, Connecticut. Its population is 12,359 (ACS 2023).
Across Connecticut’s 215 tracked cities, Derby ranks joint 34th today.
Like every Pollen Atlas city page, the Derby, CT pollen count is refreshed each morning.
Nearby cities
- Ansonia pollen count (1 miles away)
- Shelton pollen count (3 miles away)
- Orange pollen count (4 miles away)
- Oronoque pollen count (5 miles away)
- East Village pollen count (6 miles away)
- West Haven pollen count (7 miles away)
From Pollen Atlas News
See how Derby ranks in today's pollen count rankings — the worst cities for allergies today
See Derby on the US pollen map
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).