Low Pollen in Thornton, CO
Low today, mostly weed pollen.
Last updated September 30, 2026
What to do today
- It's a good day for outdoor activities since pollen levels are low.
- Do you know which plants cause your pollen allergy? Check out the pollen data to be prepared.
Forecast
About pollen in Thornton
Weed pollen is the only real presence in Thornton today, and it remains on the low side. Most people should get through the day without much irritation, though those with a strong sensitivity to ragweed and similar late-season weeds may notice mild symptoms, especially during outdoor activity in the afternoon. Over the next several days, weed pollen is expected to hold steady at this same low level before easing slightly toward the end of the period. This fits the typical pattern for early fall in the Denver area, as ragweed and other weeds wind down their season while tree varieties like cottonwood, elm, and ash stay dormant until spring. Overall, conditions should remain manageable for most residents through the coming week.
Common questions
- What is the pollen count in Thornton, CO today?
- Thornton, CO is at a low 2 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. Over the next five days it ranges from 1 to 2 of 5.
- Is weed pollen high in Thornton, CO right now?
- Weed pollen is low today at 2 of 5, and it's past its peak season. Most people won't have symptoms.