Low
Pollen is low — most people won't notice
Weed pollen is the main trigger · Tomorrow → · Updated 15 hours ago
Today in Boulder: weed pollen is very low, tree pollen is none, grass pollen is none. Overall score: 4/100. Allergies are unlikely for most people right now. Tomorrow is expected to be about the same. Updated at 12:00 AM.
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Pollen levels in Boulder are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: None. Grass pollen: None. Weed pollen: Very Low.
Tomorrow's pollen forecast for Boulder is expected to be about the same, with low pollen conditions.
Weed pollen is the highest supported pollen type in Boulder today. Weed pollen is very low.
Tree pollen in Boulder is none today.
Grass pollen in Boulder is none today.
Weed pollen in Boulder is very low today.
Tomorrow's pollen forecast for Boulder is expected to be about the same, with low pollen conditions.
Boulder, Colorado sits at the foot of the Rocky Mountains at roughly 5,400 feet, and its semi-arid climate, high UV exposure, and gusty Chinook winds create a distinctive allergy profile that can carry pollen long distances from the plains and foothills.
Tree pollen kicks off the season in early spring, typically from late February through May, with juniper and mountain cedar leading the way, followed by cottonwood, aspen, elm, box elder, ash, and oak as temperatures climb.
Grass pollen takes over from late May into July, dominated by Kentucky bluegrass, timothy, orchard grass, and brome, which thrive in irrigated lawns and along the Front Range open spaces.
By August, weed season ramps up and continues through the first hard frost in October, driven heavily by ragweed, sagebrush, Russian thistle (tumbleweed), kochia, and lamb's quarters.
Late spring often brings overlapping tree and grass pollen, intensifying symptoms for many residents.
Beyond pollen, Boulder's dry air stirs up significant dust and particulate matter, while summer wildfire smoke and occasional Front Range ozone add to respiratory irritation; indoor and outdoor molds spike after monsoon rains.
Overall, Boulder's allergy profile is defined by a long, wind-driven pollen season compounded by dust, smoke, and dryness.