Castle Rock pollen forecast - today, tomorrow and the week ahead

Today (16 July) pollen in Castle Rock is medium; grass is medium; ragweed is low. Tomorrow (17 July 2026) levels are similar - ragweed remains low, grass increasing, oak at low levels. Over the following five days grass, oak, and ragweed will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

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Castle Rock's Douglas County Front Range setting features ponderosa pine, Gambel oak, and cottonwood as the main tree pollen sources, with exposure varying considerably between the ponderosa pine-covered ridges and the more built-up commercial corridors along I-25. The dramatic topographic variation between the mesa tops and the valley floor creates distinct pollen zones, with the mesa pine forests contributing substantial tree pollen locally.

Today - 16 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Medium

    48/100

  • Oak (Quercus):

    None

    0/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    Low

    8/100

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 - 17 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    High

    59/100

  • Oak (Quercus):

    Low

    10/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    Low

    22/100

Air quality in Castle Rock

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Frequently Asked Questions

Is pollen high in Castle Rock right now?

On 16 July 2026, overall pollen levels in Castle Rock are moderate. Grass is the main contributor to airborne pollen, while ambrosia remain at lower levels

Will pollen levels change in Castle Rock tomorrow?

On 17 July 2026, pollen conditions in Castle Rock will be different from today, with ambrosia at low levels, oak at low levels and grass increasing

Is pollen expected to decrease in Castle Rock this week?

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

Which pollen types are currently active in Castle Rock?

On 16 July 2026, Grass is the dominant pollen source in Castle Rock. ambrosia are also present but at lower levels. alder, artemisia, birch, cypress, oak, and willow are not currently active.

When is pollen season in Castle Rock?
Castle Rock's Front Range Colorado setting between Denver and Colorado Springs produces a season opening with elm and cottonwood in March before oak peaks through April and May. Grass from surrounding Colorado plains peaks through May and June before mugwort extends exposure into September. The elevated setting and the Douglas County landscape mean the season is more compressed than in lower elevation cities.
How often is the Castle Rock pollen forecast updated?

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

Does pollen in Castle Rock 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 Castle Rock 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 Castle Rock, 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.

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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Castle Rock.

For long term forecasts and maps, see the Airmine app

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