Grass Pollen Count in Longmont, CO

Pollen by type in Longmont

• Longmont tree pollen count
• Longmont ragweed pollen count
• Longmont pollen count

What is the grass pollen count in Longmont today?

The Longmont grass pollen index today is 0.6 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

Longmont’s overall pollen count today is 22 (Low) across all types. See the full Longmont pollen count for the overall index and every type together.

Longmont is a city spanning Boulder County and Weld County in Colorado. Its population is 98,958 (ACS 2023).

Longmont Grass Pollen Count: 5-Day Forecast

Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows Longmont’s overall trend across the week. Today’s grass pollen reading is the headline above.

Species driving Longmont’s grass pollen

The modelled data reports grass as one combined index — there is no species-by-species split for grass anywhere in the data, so this page does not invent one. Today’s modelled grass index for Longmont is 0.6 (Low), and the 5-day overall trend above shows the shape of the week.

As regional context only — not as today’s readings — 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.

The Colorado allergy season guide singles out juniper, arriving ahead of the local tree season, and the ragweed and sagebrush-family weeds of late summer.

Plants affecting Longmont now — grass pollen

Detailed plant-by-plant readings for the grass pollen category were not returned in today’s source data for Longmont. The type summary stands: grass pollen reads 0.6 (Low) today.

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’s readings.

Plant detail returns here automatically on any day the feed includes it.

What this grass pollen level means

Low risk. Keep windows open; consider allergy meds only if sensitive.

Enjoy outdoor activities.

Grasses follow in a compressed early-summer run. This month sits outside the usual grass pollen window for the Mountain West pattern, so today’s grass pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. The Colorado allergy season guide singles out juniper, arriving ahead of the local tree season, and the ragweed and sagebrush-family weeds of late summer.

Longmont allergies today

Longmont allergies today are set by the same reading as the Longmont pollen count today: the Total Pollen Index is 22 (Low), and the grass pollen index on this page is 0.6 (Low) of it. When people ask about Longmont allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Longmont.

Allergies in Longmont follow the Colorado calendar set out on the full Longmont page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in Longmont before heading outdoors, the grass pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.

Read the five-day overall trend above as the Longmont allergy forecast for the grass pollen season: it shows whether Longmont allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.