Decorah, IA Pollen Count
Decorah, IA · Last updated Friday, November 6, 2026
This page shows the most recent reading available for Decorah — 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).
Decorah, IA
Weeds Index
How active weeds pollen is today (0–100).
Decorah, IA
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Decorah Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Decorah residents check each morning
The Decorah pollen count today is 22 (Low). The main driver is Ragweed, with weed pollen at 29 today. The full split is tree pollen 0.6, grass pollen 0.6, weed pollen 29. 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 Decorah 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 Plains and around the Great Lakes, ragweed is a familiar late-season plant of open ground, field edges and disturbed soil, which is why it so often leads inland autumn readings.
To see whether today’s pollen level holds, check the 5-day Decorah pollen forecast below — it is currently holding, with Friday the highest day in the window.
This is the pollen count Decorah residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Decorah pollen count today?
The Decorah pollen count today is 22 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Decorah: this page is updated every morning with the day’s modelled reading.
Decorah allergies today
Decorah allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 22 (Low), driven mainly by Ragweed. When people ask about Decorah allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Decorah.
Allergies in Decorah follow the Iowa 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 Decorah 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 Decorah allergy forecast: today reads 22 (Low), and the day-by-day outlook shows whether Decorah 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 Decorah today records is this same combined reading — tree, grass, weed and mold in one index.
The Decorah allergy count today is 22 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Decorah: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 22 | Low |
| Saturday, November 7 | 18 | Low |
| Sunday, November 8 | 13 | Low |
| Monday, November 9 | 8 | Low |
| Tuesday, November 10 | 5 | Low |
Pollen Atlas forecasts Decorah’s pollen count to peak on Friday at 22 (Low) over the next 5 days.
Pollen by type in Decorah
What is driving Decorah’s pollen today
The shape of today’s 22 (Low) is set by weed pollen at 29 (Low on its own scale) — about 96% of the four category readings added together, 28.4 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 Iowa 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 Decorah, so the drivers have to be read from the category split above. The Iowa guide’s account of Iowa names ragweed, the state’s dominant allergen, over a maple, oak and hickory spring — 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 5 to 22, never changing band. Today’s 22 sits 9 points above the window’s average of 13.2 — a moving window, worth reading day by day rather than from the average.
Plants affecting Decorah now
Detailed plant-by-plant readings for Decorah 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 29 (Low).
In the Midwest & Great Lakes pattern, the plants that typically shape this city’s year are spring trees, late-spring and summer grasses, and late-summer and autumn 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.
Decorah pollen through the year
The Decorah pollen year runs in chapters, set by the Midwest & Great Lakes pattern and the Iowa calendar. Trees come first: trees run from March into May, later near the big lakes. Grasses take the middle of the year: grasses hold from May through July. Weeds close it out: ragweed builds from mid-August, peaks in September, and ends at the first frost. Mold builds through the humid summer and fills the gaps between chapters.
The Iowa allergy season guide names ragweed, the state’s dominant allergen, over a maple, oak and hickory spring. Des Moines finished in the top ten of the Asthma and Allergy Foundation of America’s 2024 Allergy Capitals list, reflecting that complete, high-volume calendar. The river valleys are the tree reservoirs: oak-hickory floodplain woodland along the Des Moines, Cedar, Iowa and Mississippi rivers feeds the spring season through valley towns.
November falls between the main chapters of the Iowa 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 Iowa year, March to October — a compressed season, which is why its chapters arrive in quick succession. The full calendar is set out in the Iowa allergy season guide.
How to read this index
Pollen Atlas reports the Decorah 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 Decorah, IA 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.
Decorah in today’s national picture
At 22 (Low), Decorah ranks joint 44134th 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 Decorah: Calmar, IA (9 miles away) reads 28 (Low); Ridgeway, IA (10 miles away) reads 28 (Low); Ossian, IA (11 miles away) reads 28 (Low). Decorah reads 6 points lower than its nearest tracked neighbour today. Across Iowa’s 1026 tracked cities, today runs from 16 in Keokuk to 30 in Grimes.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Decorah resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Decorah, IA 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.
Decorah in its local area
Across Iowa’s 1026 tracked cities, Decorah ranks joint 938th today.
Like every Pollen Atlas city page, the Decorah, IA pollen count is refreshed each morning.
Nearby cities
- Calmar pollen count (9 miles away)
- Ridgeway pollen count (10 miles away)
- Ossian pollen count (11 miles away)
- Spillville pollen count (11 miles away)
- Burr Oak pollen count (11 miles away)
- Fort Atkinson pollen count (13 miles away)
From Pollen Atlas News
See how Decorah 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).