Great Falls, MT Pollen Count

What is the Great Falls pollen count today?

The Great Falls pollen count today is 5 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Grass.

Short answer for anyone searching pollen count today Great Falls: this page is updated every morning with the day’s modelled reading.

Great Falls allergies today

Great Falls allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 5 (Low), driven mainly by Grass. When people ask about Great Falls allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Great Falls.

Allergies in Great Falls follow the Montana 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 Great Falls 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 Great Falls allergy forecast: today reads 5 (Low), and the day-by-day outlook shows whether Great Falls 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 Great Falls today records is this same combined reading — tree, grass, weed and mold in one index.

The Great Falls allergy count today is 5 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.

Pollen count today Great Falls: the 5-day forecast

Pollen Atlas forecasts Great Falls’s pollen count to peak on Friday at 5 (Low) over the next 5 days.

Pollen by type in Great Falls

• Great Falls tree pollen count
• Great Falls grass pollen count
• Great Falls ragweed pollen count

What is driving Great Falls’s pollen today

The shape of today’s 5 (Low) is set by tree pollen at 0.6 (Low on its own scale) — about 33% of the four category readings added together, level with grass pollen at 0.6. 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 Montana tree chapter runs March 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 Great Falls, so the drivers have to be read from the category split above. The Montana guide’s account of Montana names sagebrush, flowering late on the dry benches, over a grass summer of timothy, orchard grass, bluegrass and ryegrass — 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 5, never changing band. Today’s 5 sits level with the window’s average of 5 — a steady window, in which one day reads much like the next.

Plants affecting Great Falls now

Detailed plant-by-plant readings for Great Falls 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 0.6 (Low).

In the Northern Rockies pattern, the plants that typically shape this city’s year are river-corridor trees, a June grass crest of timothy, orchard grass, bluegrass and ryegrass, and a late sagebrush finish — 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.

Great Falls pollen through the year

Three chapters make the Montana pollen year, and Great Falls follows them in the Northern Rockies order. The tree chapter: river-corridor trees open in late March or April, varying by valley elevation, and run into May. The grass chapter: grasses run from May through July with a June crest, when the hay grasses flower together. The weed chapter: ragweed, sagebrush, wormwood and pigweed run from August until the first hard frost, typically in October.

Valley inversions in western Montana can hold pollen close to town on still mornings, even under famously big, clean-looking skies. Western valleys run a tree-and-grass calendar shaped by rivers and elevation, while the eastern plains add a stronger wind-blown weed and sagebrush finish. The Montana guide singles out sagebrush, flowering late on the dry benches, over a grass summer of timothy, orchard grass, bluegrass and ryegrass.

November falls between the main chapters of the Montana 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 Montana year, March to October — a compressed season, which is why its chapters arrive in quick succession. The full calendar is set out in the Montana allergy season guide.

How to read this index

Pollen Atlas reports the Great Falls 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.

Great Falls in today’s national picture

At 5 (Low), Great Falls ranks joint 86157th 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 Great Falls: Black Eagle, MT (3 miles away) reads 5 (Low); Gibson Flats, MT (4 miles away) reads 5 (Low); Malmstrom AFB, MT (5 miles away) reads 5 (Low). Great Falls reads exactly level with its nearest tracked neighbour today. Across Montana’s 496 tracked cities, today runs from 5 in Missoula to 29 in Sidney.

Pollen totals are population numbers; symptoms are personal. The same reading can leave one Great Falls resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Great Falls, MT 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.

Great Falls in its local area

Great Falls is a city in Cascade County, Montana. Its population is 60,412 (ACS 2023).

Across Montana’s 496 tracked cities, Great Falls ranks joint 194th today.

Like every Pollen Atlas city page, the Great Falls, MT pollen count is refreshed each morning.

Nearby cities

• Black Eagle pollen count (3 miles away)
• Gibson Flats pollen count (4 miles away)
• Malmstrom AFB pollen count (5 miles away)
• Big Stone Colony pollen count (8 miles away)
• Sun Prairie pollen count (9 miles away)
• Sand Coulee pollen count (9 miles away)

From Pollen Atlas News

• Montana allergy season
• Grass pollen season