St Paul, MN Pollen Levels Today

St. Paul, Minnesota experiences a pronounced allergy profile shaped by its humid continental climate, with distinct seasons that concentrate pollen exposure into intense, relatively short windows.

Spring tree pollen typically launches the allergy calendar from late March through May, driven by abundant native and landscape species including box elder, silver and red maple, oak, birch, cottonwood, elm, ash, and walnut, with peak counts usually arriving in late April and early May.

As tree pollen wanes, grass season takes over from late May through July, dominated by timothy, Kentucky bluegrass, orchard grass, and brome, often peaking in June.

Late summer and fall bring the region's most notorious trigger: weed pollen, led by short and giant ragweed from mid-August through the first hard frost in October, alongside lamb's quarters, pigweed, and sagebrush. The brief overlap between late grass and early ragweed in August can significantly intensify symptoms for multi-sensitive sufferers.

Non-pollen allergens are also substantial here—outdoor mold spores thrive in damp spring conditions and decaying autumn leaves, while humid summers and tightly sealed homes during long winters elevate indoor dust mite and mold exposure.

Overall, St. Paul's allergy profile is defined by high seasonal variability, severe ragweed autumns, and persistent year-round mold pressure.