Westminster pollen forecast - today, tomorrow and the week ahead

On 25 June 2026, overall pollen levels in Westminster are moderate. Grass is the main contributor to airborne pollen

On 26 June 2026, pollen conditions in Westminster will be different from today, with willow at low levels and grass increasing

According to the five-day outlook, grass and willow pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.

On 25 June 2026, Grass is the dominant pollen source in Westminster. willow, hazel, and cypress are not currently active.

Westminster'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 Front Range setting and Big Dry Creek valley channel prevailing winds, while surrounding Colorado high plains contribute substantial grass pollen. The Rocky Mountain foothills to the west add pine and grass pollen under prevailing downslope easterly winds.

The Westminster pollen forecast is updated four times daily. See the timestamp below for the most recent update.

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.

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 Westminster, 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.