Shadelands Ranch Historical Museum, Walnut Creek Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Shadelands Ranch Historical Museum, Walnut Creek is moderate; ragweed is moderate; mold (alternaria) and mold (cladosporium) are low.
Pollen Tomorrow
Tomorrow (11 October 2026) ragweed remains moderate, mold (alternaria) remains low, mold (cladosporium) remains low, grass at low levels.
7-Day Trend
Over the next week grass, mugwort, ragweed, and mold (alternaria) will increase; mold (cladosporium) will decrease.
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Pollen Risk
Today - 10 October
| 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 | 30/100 |
| Mold (Alternaria) | Low | 8/100 |
| Mold (Cladosporium) | Low | 18/100 |
Tomorrow - 11 October
| 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 | 7/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 41/100 | |
| Mold (Alternaria) | Low | 11/100 | |
| Mold (Cladosporium) | Low | 18/100 |
Local Environmental Conditions
This location in Walnut Creek is surrounded mainly by built-up land, with a good deal of woodland. A nearby park adds mown lawns and planted trees to the local pollen mix. The key allergenic tree nearby is oak. Grasses and weeds such as plantain and mugwort round out the local mix.
Tree pollen peaks in mid-spring, when the weather warms to around 15°C and oak is in full flower. Then come the grasses, strongest in late spring and fading by early fall. Plantain and mugwort flower through much of the warmer half of the year. Winter is the wettest time of year, and heavy showers can bring short breaks in pollen.
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Frequently Asked Questions About Pollen in California
Is pollen high in Walnut Creek right now?
On 10 October 2026, overall pollen levels in Walnut Creek are moderate. Ambrosia is the main contributor to airborne pollen
Will pollen levels change in Walnut Creek tomorrow?
On 11 October 2026, pollen conditions in Walnut Creek will be different from today, with grass at low levels, ambrosia at moderate levels
Is pollen expected to decrease in Walnut Creek this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels will increase later in the week.
Which pollen types are currently active in Walnut Creek?
On 10 October 2026, Ambrosia is the dominant pollen source in Walnut Creek. artemisia and grass are not currently active.
When is pollen season in Walnut Creek?
How often is the Walnut Creek pollen forecast updated?
The Walnut Creek pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Walnut Creek 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 Walnut Creek 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 Walnut Creek, 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 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
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. |
Get More in the Airmine Pollen app
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).
