Lakewood, Colorado pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Lakewood, Colorado is moderate; ragweed is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains moderate, grass at low levels, mugwort at low levels.
7-Day Trend
Over the next week grass and mugwort will increase; ragweed will decrease.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Moderate | 39/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Low | 1/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 5/100 | |
| Ragweed (Ambrosia) | Moderate | 49/100 |
Local Environmental Conditions
Lakewood's parks, including Belmar Park and the Lakewood Gulch corridor, feature oak, ash, and cottonwood 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.
Lakewood's pollen season in Colorado opens with elm and cottonwood from late February, followed by oak and ash through April and May. Grass pollen peaks through June and July. The high plains setting and semi-arid climate mean fewer rainfall interruptions than in eastern US cities, while the Rocky Mountain foothills to the west contribute pine and grass pollen under prevailing downslope easterly winds throughout the season.
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Frequently Asked Questions About Pollen in Colorado
Is pollen high in Lakewood, Colorado right now?
On 20 September 2026, overall pollen levels in Lakewood, Colorado are moderate. Ambrosia is the main contributor to airborne pollen
Will pollen levels change in Lakewood, Colorado tomorrow?
On 21 September 2026, pollen conditions in Lakewood, Colorado will be different from today, with ambrosia at moderate levels, artemisia at low levels, grass at low levels
Is pollen expected to decrease in Lakewood, Colorado this week?
According to the five-day outlook, ambrosia pollen levels are expected to gradually decrease, while artemisia and grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Lakewood, Colorado?
On 20 September 2026, Ambrosia is the dominant pollen source in Lakewood, Colorado. artemisia and grass are not currently active.
When is pollen season in Lakewood, Colorado?
How often is the Lakewood, Colorado pollen forecast updated?
The Lakewood, Colorado pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Lakewood, Colorado 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 Lakewood, Colorado 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 Lakewood, Colorado, 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.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
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Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
