Castroville, Texas Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (6 October) pollen in Castroville, Texas is high; ragweed is high; grass, mold (alternaria), and mold (cladosporium) are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (7 October 2026) ragweed remains high, mold (alternaria) remains moderate, mold (cladosporium) remains moderate, grass increasing, mugwort increasing.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase; mold (alternaria) and mold (cladosporium) will decrease.
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Pollen Risk
Today - 6 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) | Moderate | 47/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 23/100 |
| Ragweed (Ambrosia) | High | 65/100 |
| Alternaria | Moderate | 47/100 |
| Cladosporium | Moderate | 42/100 |
Tomorrow - 7 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) | High | 59/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Moderate | 34/100 | |
| Ragweed (Ambrosia) | High | 70/100 | |
| Alternaria | Moderate | 45/100 | |
| Cladosporium | Moderate | 34/100 |
Local Environmental Conditions
The area around the heart of Castroville, Texas is a mix of open grassland and woodland, plus a good deal of farmland. The damp ground beside a watercourse nearby supports trees, shrubs and reeds, adding to local pollen. Allergenic trees nearby include pecan and elm. Grass pollen adds noticeably to the overall load.
Month by month, elm opens the pollen season from midwinter into late winter. Pecan follows, peaking around early spring. Grasses are next, reaching their height around late spring and tailing off by late summer. A smaller weed peak follows from early summer into early fall, from plants on verges and waste ground. Temperatures range from around 10°C in the coldest month to around 30°C in the warmest.
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Frequently Asked Questions About Pollen in Texas
Is pollen high in Castroville, Texas right now?
On 6 October 2026, overall pollen levels in Castroville, Texas are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Castroville, Texas tomorrow?
On 7 October 2026, pollen conditions in Castroville, Texas will be different from today, with ambrosia at high levels and artemisia, grass increasing
Is pollen expected to decrease in Castroville, Texas this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Castroville, Texas?
On 6 October 2026, Ambrosia is the dominant pollen source in Castroville, Texas. grass and artemisia are also present but at lower levels.
When is pollen season in Castroville, Texas?
How often is the Castroville, Texas pollen forecast updated?
The Castroville, Texas pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Castroville, Texas 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 Castroville, Texas 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 Castroville, Texas, 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. |
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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).
