Grand Junction pollen forecast - today, tomorrow and the week ahead

On 9 August 2026, overall pollen levels in Grand Junction are low. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels

On 10 August 2026, pollen conditions in Grand Junction will be similar to today, with ambrosia at low levels, artemisia at low levels, grass at low levels

According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.

On 9 August 2026, Ambrosia is the dominant pollen source in Grand Junction. artemisia and grass are also present but at lower levels. cypress are not currently active.

Grand Junction's pollen season opens with cottonwood along the Colorado River from late February, followed by ash and introduced trees through March and April. Grass pollen peaks through May and June. The Grand Valley setting concentrates pollen under calm conditions, while surrounding Colorado Plateau desert scrub and farmland contribute seasonal grass and shrub pollen. The hot, dry summer largely suppresses mid-season pollen after June.

The Grand Junction 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 Grand Junction, 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.