Minneapolis Mold Forecast - Today, Tomorrow and the Week Ahead
Mold Today
Today (11 October) mold in Minneapolis is low; alternaria and cladosporium are low.
Mold Tomorrow
Tomorrow (12 October 2026) levels are similar to today.
7-Day Trend
Over the next week alternaria and cladosporium will decrease.
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Mold Risk
Today - 11 October
| Mold species | Level | Value |
|---|---|---|
| Alternaria | Low | 12/100 |
| Cladosporium | Low | 17/100 |
Tomorrow - 12 October
| Mold species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alternaria | Low | 16/100 | Decreasing |
| Cladosporium | Low | 20/100 | Decreasing |
Local Mold Conditions
Mold in Minneapolis grows mostly on the leaves and grass of its parks, boulevards and lakeshores. Fallen leaves from maples, oaks and elms collect in yards, gutters and the wooded parkland along the Mississippi River and around the Chain of Lakes, while lawns and sports fields add grass clippings. The surrounding farmland leaves crop residues and stubble after harvest, and the many wetlands, creeks and lakeshores in and around the city keep plant debris damp for longer. Compost and garden mulch add more.
Mold in Minneapolis follows the warm months. Spores rise after the snow melts in April, increase through the humid summer, when July averages around 23°C, and usually peak from late July to October, as Cladosporium and Alternaria feed on drying grass, harvested fields and fallen leaves. Raking and mowing can raise spore levels nearby. Wet spells and thunderstorms bring short spikes, while snow cover and temperatures well below freezing from December to March keep outdoor mold in Minneapolis at very low levels.
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Resource Hub
Mold forecast neighborhoods 104 neighborhoods
Sports venues in Minneapolis 6 sports venues
Frequently Asked Questions About Mold in Minnesota
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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