Fort Collins, CO Pollen Count Today
Fort Collins, CO · 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).
Fort Collins, CO
Weeds Index
How active weeds pollen is today (0–100).
Fort Collins, CO
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Fort Collins Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Fort Collins residents check each morning
The Fort Collins pollen count today is 18 (Low). The main driver is Ragweed, with weed pollen at 23 today. Weed pollen leads the split at 23 (Low on its own scale), followed by tree pollen at 1 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 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 weed pollen or mold, reading noticeably higher than the rest, which is why the split is printed on every Fort Collins page.
Higher-elevation Mountain West cities generally run a shorter outdoor pollen season than the coasts or the South, with the main tree and grass activity compressed into the warmer months. Autumn and winter pages in this region are therefore commonly quiet, with low totals built from small weed and mold values. A low reading in this region and season is the expected pattern, and any future rise will show first in the category split and the forecast, not in the headline alone.
To see whether today’s pollen level holds, check the 5-day Fort Collins pollen forecast below — it is currently holding, with Wednesday the highest day in the window.
This is the pollen count Fort Collins residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Fort Collins pollen count today?
The Fort Collins pollen count today is 18 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Fort Collins: this page is updated every morning with the day’s modelled reading.
Fort Collins allergies today
Fort Collins allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 18 (Low), driven mainly by Ragweed. When people ask about Fort Collins allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Fort Collins.
Allergies in Fort Collins follow the Colorado 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 Fort Collins 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 Fort Collins allergy forecast: today reads 18 (Low), and the day-by-day outlook shows whether Fort Collins 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 Fort Collins today records is this same combined reading — tree, grass, weed and mold in one index.
The Fort Collins allergy count today is 18 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Fort Collins: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 18 | Low |
| Sunday, November 8 | 18 | Low |
| Monday, November 9 | 18 | Low |
| Tuesday, November 10 | 18 | Low |
| Wednesday, November 11 | 19 | Low |
Pollen Atlas forecasts Fort Collins’s pollen count to peak on Wednesday at 19 (Low) over the next 5 days.
Pollen by type in Fort Collins
What is driving Fort Collins’s pollen today
The shape of today’s 18 (Low) is set by weed pollen at 23 (Low on its own scale) — about 93% of the four category readings added together, 22 points clear of the next category, tree pollen at 1. 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 Colorado 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 Fort Collins, so the drivers have to be read from the category split above. The Colorado guide’s account of Colorado names juniper, arriving ahead of the local tree season, and the ragweed and sagebrush-family weeds of late summer — 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 18 to 19, never changing band. Today’s 18 sits 0 points below the window’s average of 18.2 — a steady window, in which one day reads much like the next.
Plants affecting Fort Collins now
Detailed plant-by-plant readings for Fort Collins 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 1 (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 23 (Low).
In the Mountain West pattern, the plants that typically shape this city’s year are spring trees and late-spring grasses in a compressed warm-season window — 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.
Fort Collins pollen through the year
Three chapters make the Colorado pollen year, and Fort Collins follows them in the Mountain West order. The tree chapter: juniper can arrive in late winter, and the main tree wave builds in spring — as late as April at Denver’s altitude. The grass chapter: grasses follow in a compressed early-summer run. The weed chapter: ragweed and sagebrush-family weeds close the year from late summer.
Altitude compresses Colorado’s season rather than removing it: the waves arrive late — Denver’s tree pollen typically builds in April — and end with early frosts, but they run in a tight sequence. The season ends with the first hard frosts, which stop the late-summer weeds — Denver usually reaches frost in fall, while mountain towns can frost far earlier. The Colorado guide singles out juniper, arriving ahead of the local tree season, and the ragweed and sagebrush-family weeds of late summer.
November falls between the main chapters of the Colorado 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 Colorado 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 Colorado allergy season guide.
How to read this index
Pollen Atlas reports the Fort Collins 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.
Fort Collins in today’s national picture
At 18 (Low), Fort Collins ranks joint 57574th 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 Fort Collins: Timnath, CO (5 miles away) reads 22 (Low); Laporte, CO (7 miles away) reads 5 (Low); Loveland, CO (9 miles away) reads 22 (Low). Fort Collins reads 4 points lower than its nearest tracked neighbour today. Across Colorado’s 479 tracked cities, today runs from 5 in Parker to 33 in Cathedral.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Fort Collins resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Fort Collins, CO 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.
Fort Collins in its local area
Fort Collins is a city in Larimer County, Colorado. Its population is 169,705 (ACS 2023).
Across Colorado’s 479 tracked cities, Fort Collins ranks joint 260th today.
Like every Pollen Atlas city page, the Fort Collins, CO pollen count is refreshed each morning.
Nearby cities
- Timnath pollen count (5 miles away)
- Laporte pollen count (7 miles away)
- Loveland pollen count (9 miles away)
- Windsor pollen count (9 miles away)
- Severance pollen count (11 miles away)
- Wellington pollen count (11 miles away)
From Pollen Atlas News
See how Fort Collins ranks in today's pollen count rankings — the worst cities for allergies today
See Fort Collins 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).