Thornton pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Thornton is medium; grass and ragweed are medium; mugwort is low. Tomorrow (10 August 2026) levels are similar. Over the following five days grass, mugwort, and ragweed will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Thornton's parks, including Trail Winds Park and the South Platte River corridor, feature cottonwood, ash, and oak as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Colorado high plains contribute substantial grass pollen, while the Rocky Mountain foothills to the west add pine and grass pollen under prevailing downslope easterly winds.
Today - 9 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Medium
31/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
6/100
-
Ragweed (Ambrosia):
Medium
39/100
High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.
Tomorrow - 10 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Medium
33/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
9/100
-
Ragweed (Ambrosia):
Medium
40/100
Air quality in Thornton
View air qualityFrequently Asked Questions
Is pollen high in Thornton right now?
On 9 August 2026, overall pollen levels in Thornton are moderate. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Thornton tomorrow?
On 10 August 2026, pollen conditions in Thornton will be similar to today, with ambrosia at medium levels, artemisia at low levels, grass at medium levels
Is pollen expected to decrease in Thornton this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Thornton?
On 9 August 2026, Ambrosia is the dominant pollen source in Thornton. grass and artemisia are also present but at lower levels. cypress are not currently active.
When is pollen season in Thornton?
How often is the Thornton pollen forecast updated?
The Thornton pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Thornton come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Thornton based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Thornton, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Want to see pollen forecasts for other cities in United States?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Thornton.
Get the full experience in the Airmine app.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.