East Rock, New Haven Mold Forecast - Today, Tomorrow and the Week Ahead
Mold Today
Today (6 October) mold in East Rock, New Haven is low; alternaria and cladosporium are low.
Mold Tomorrow
Tomorrow (7 October 2026) alternaria remains low, cladosporium increasing.
7-Day Trend
Over the next week alternaria and cladosporium will decrease.
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Mold Risk
Today - 6 October
| Mold species | Level | Value |
|---|---|---|
| Alternaria | Low | 5/100 |
| Cladosporium | Low | 22/100 |
Tomorrow - 7 October
| Mold species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alternaria | Low | 8/100 | Steady |
| Cladosporium | Moderate | 30/100 | Steady |
Local Mold Conditions
Woodland makes up around 63% of the area around this site in New Haven, which gives mold plenty of organic matter to feed on. The forest floor is the biggest reservoir, with fallen oak and maple leaves, bark and dead wood breaking down slowly in the damp shade. Even in the developed parts, lawn clippings, flower beds and leaf piles give mold places to start.
The mold season is led by Cladosporium, which thrives on the leaf litter and decaying wood from April to October and peaks in July, at roughly 24°C. Alternaria follows a warmer pattern, rising from May to September and peaking in July. Outdoor mold is largely dormant from December to March, when temperatures stay under 5°C.
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Resource Hub
Mold forecast neighborhoods 10 neighborhoods
Sports venues in New Haven 1 sports venue
Frequently Asked Questions About Mold in Connecticut
Why do I still have allergy symptoms after the pollen season?
Allergy symptoms after the main pollen season may be caused by mold spores. Outdoor mold levels can remain high into late summer and autumn, when pollen levels are already falling. Mold allergy can cause symptoms similar to pollen allergy, including sneezing, a runny or blocked nose, itchy eyes, coughing, and wheezing.
What are mold spores and why do they cause allergies?
Mold spores are tiny particles released by fungi into the air. When inhaled, they can trigger an allergic reaction in sensitive people. Common symptoms include sneezing, a runny or blocked nose, itchy or watery eyes, coughing, and wheezing.
When are mold spore levels highest?
Outdoor mold spore levels often increase during warm and humid conditions, particularly when there is plenty of decaying vegetation. Levels can vary considerably with weather, season, vegetation, and location, and some types of mold are more common during particular times of the year, e.g. in the Fall.
How can I reduce my exposure to mold spores?
If you are sensitive to mold, check local mold spore levels and forecasts before spending long periods outdoors. On high-risk days, reducing time around dense vegetation, compost, fallen leaves, and other sources of decaying plant material may help limit exposure.
Understanding the Scale
The 0–100 mold scores represent risk levels, not direct mold measurements. Higher scores indicate higher risk.
Mold
| 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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