Littleton, CO Pollen Count Today
Littleton, 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).
Littleton, CO
Weeds Index
How active weeds pollen is today (0–100).
Littleton, CO
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Littleton Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Littleton residents check each morning
The Littleton pollen count today is 25 (Low). The main driver is Ragweed, with weed pollen at 33 today. That total sits on a narrow base: weed pollen is 33 while tree pollen is just 0.6 and grass pollen 0.6. Plant-by-plant detail for Littleton, CO 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 weed pollen or mold, reading noticeably higher than the rest, which is why the split is printed on every Littleton 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 Littleton pollen forecast below — it is currently holding, with Saturday the highest day in the window.
This is the pollen count Littleton residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Littleton pollen count today?
The Littleton pollen count today is 25 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Littleton: this page is updated every morning with the day’s modelled reading.
Littleton allergies today
Littleton allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 25 (Low), driven mainly by Ragweed. When people ask about Littleton allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Littleton.
Allergies in Littleton 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 Littleton 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 Littleton allergy forecast: today reads 25 (Low), and the day-by-day outlook shows whether Littleton 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 Littleton today records is this same combined reading — tree, grass, weed and mold in one index.
The Littleton allergy count today is 25 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Littleton: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 25 | Low |
| Sunday, November 8 | 25 | Low |
| Monday, November 9 | 25 | Low |
| Tuesday, November 10 | 25 | Low |
| Wednesday, November 11 | 25 | Low |
Pollen Atlas forecasts Littleton’s pollen count to peak on Saturday at 25 (Low) over the next 5 days.
Pollen by type in Littleton
What is driving Littleton’s pollen today
The shape of today’s 25 (Low) is set by weed pollen at 33 (Low on its own scale) — about 96% of the four category readings added together, 32.4 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 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 Littleton, 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 25 to 25, never changing band. Today’s 25 sits level with the window’s average of 25 — a steady window, in which one day reads much like the next.
Plants affecting Littleton now
Detailed plant-by-plant readings for Littleton 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 33 (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.
Littleton pollen through the year
Chapter by chapter, the Littleton pollen year runs like this:
- Juniper can arrive in late winter, and the main tree wave builds in spring — as late as April at Denver’s altitude.
- Grasses follow in a compressed early-summer run.
- Ragweed and sagebrush-family weeds close the year from late summer.
The Colorado allergy season guide names juniper, arriving ahead of the local tree season, and the ragweed and sagebrush-family weeds of 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.
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 Littleton 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.
Littleton in today’s national picture
At 25 (Low), Littleton ranks joint 33676th 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 Littleton: Columbine Valley, CO (1 miles away) reads 25 (Low); Columbine, CO (3 miles away) reads 25 (Low); Bow Mar, CO (3 miles away) reads 25 (Low). Littleton reads exactly level with 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 Littleton resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Littleton, 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.
Littleton in its local area
Littleton is a city spanning Arapahoe County, Jefferson County and Douglas County in Colorado. Its population is 45,092 (ACS 2023).
Across Colorado’s 479 tracked cities, Littleton ranks joint 85th today.
Like every Pollen Atlas city page, the Littleton, CO pollen count is refreshed each morning.
Nearby cities
- Columbine Valley pollen count (1 miles away)
- Columbine pollen count (3 miles away)
- Bow Mar pollen count (3 miles away)
- Sheridan pollen count (4 miles away)
- Englewood pollen count (4 miles away)
- Highlands Ranch pollen count (4 miles away)
From Pollen Atlas News
See how Littleton ranks in today's pollen count rankings — the worst cities for allergies today
See Littleton 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).