Flagstaff Pollen Report

Stay ahead of Flagstaff’s unique high-altitude allergen season with locally monitored pollen levels. Our reports are reviewed by Lindsey, a board certified family nurse practitioner specializing in allergy and immunology, so you can make confident, informed health decisions every day.

Today's Pollen Forecast

Pollen Index

Overall Pollen Level

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Current Allergen Breakdown

Tree Pollen

Pollen Level

Grass Pollen

Pollen Level

Weed Pollen

Pollen Level

Mold

Pollen Level

This Pollen Report is For Flagstaff. Check Out Our Other Local Pollen Reports As Well!

Clinically Guided Pollen Reporting and Allergy Management

At Carefree Allergy, the pollen report is not a generic feed. Lindsey personally reviews and interprets local allergen data to provide meaningful, clinically relevant information for patients in Arizona. This allows individuals and families to understand what is actively circulating in the air, how it may be affecting their symptoms, and how to plan the most effective allergy treatment approach.

The data behind the report comes from Pollykit, a personal air sampling kit that Lindsey uses to collect and analyze real pollen samples in the lab. You can also order one for your own home to get a full breakdown of exactly what pollen and allergens Lindsey finds inside and outside your living environment, giving you a far more precise picture than regional counts alone.

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What Pollens are in the Air

Spring is one of the most challenging seasons for allergy sufferers in Flagstaff and across Arizona. As temperatures begin to rise at elevation, trees launch the pollen season with full force: ponderosa pines, oaks, junipers, and cottonwoods are among the biggest culprits in the Flagstaff area, releasing large amounts of pollen that can trigger sneezing, itchy eyes, and congestion. If you’ve noticed your symptoms flaring up between March and May, tree pollen is likely to blame; Flagstaff’s higher altitude means the season starts slightly later than in the Valley but can be just as intense. Grasses also start making their presence felt toward the end of spring, so even as tree season winds down, relief may still be a few weeks away.

Significant

Oaks – Live Oak, Shumard’s Oak, Post Oak

Walnuts & Pecans – Black Walnut, Arizona Walnut, Pecan

Mulberries – Red Mulberry, White Mulberry, Paper-Mulberry

Ashes – Green Ash, Mexican Ash

Cedars & Junipers – Ashe’s Juniper, Eastern Red-Cedar

Ragweed – Annual Ragweed, Great Ragweed, Perennial Ragweed

Grasses – Bermuda Grass, Orchard Grass, Perennial Rye Grass

Moderate

Elms – American Elm, Slippery Elm, Winged Elm

Poplars & Cottonwoods – Eastern Cottonwood, White Poplar

Mesquites – Honey Mesquite, American Screw-Bean

Plantains – English Plantain, Great Plantain, Woolly Plantain

Amaranths & Goosefoots – Red-Root Amaranth, Giant-Seed Goosefoot

Alfalfa – Alfalfa, Black Medick

Nettles & DocksHeart-Leaf Nettle, Curly Dock

Sorghum & Giant Reed – Johnson Grass, Giant-Reed

Mild

Clovers – Red Clover, White Clover, Crimson Clover

Cat-Tails – Broad-Leaf Cat-Tail, Southern Cat-Tail

Oats & Barley – Oat, Wild Oat, Common Barley

If your allergies don’t let up after spring, summer may be adding to the problem. This season shifts the focus from trees to grasses and weeds. While Flagstaff’s cooler mountain climate offers some relief from the intense grass pollen seen in lower elevations, timothy grass and other mountain grasses are common triggers that peak during the warmer months. Ragweed and dock weed also become a concern as summer progresses, thriving even at higher altitudes. For those who’ve never connected their mid-year sniffles to allergies, summer grass and weed pollen in the Flagstaff area is often the overlooked cause.

Significant

Ragweed – Annual Ragweed, Great Ragweed, Perennial Ragweed

Grasses – Bermuda Grass, Orchard Grass, Perennial Rye Grass

Mulberries – Red Mulberry, White Mulberry, Paper-Mulberry

Privets – Japanese Privet, Glossy Privet, California Privet

Amaranths – Palmer’s Amaranth, Spiny Amaranth

Corn – Corn (Zea mays)

Moderate

Mesquites – Honey Mesquite, American Screw-Bean
Sorghum & Giant Reed – Johnson Grass, Broom-Corn, Giant-Reed
Plantains – English Plantain, Great Plantain, Woolly Plantain
Amaranths & Goosefoots – Red-Root Amaranth, Sandhill Amaranth
Alfalfa – Alfalfa, Black Medick
Hemp & Nettles – Hemp (Cannabis), Heart-Leaf Nettle
Cocklebur – Rough Cockleburr

Mild

Clovers – Red Clover, White Clover

Cat-Tails – Broad-Leaf Cat-Tail, Southern Cat-Tail

St. Augustine Grass – St. Augustine Grass

Fall doesn’t bring much relief for allergy sufferers in Flagstaff either. While the cooler mountain temperatures begin to wind down some allergens, grasses and weeds remain active well into the season. Ragweed and dock weed continue releasing pollen through the dry autumn months, and sagebrush, a particularly prevalent plant in the Flagstaff region, peaks in fall and is a surprisingly common trigger that many people don’t think to watch out for. If your symptoms tend to linger past summer, fall allergens in the high country may be the reason.

Significant

Grasses – Bermuda Grass, Orchard Grass, Perennial Rye Grass
Privets – Japanese Privet, Glossy Privet, California Privet
Amaranths – Spiny Amaranth
Corn – Corn (Zea mays)

Moderate

Elms – Cedar Elm

Sorghum & Giant Reed – Johnson Grass, Broom-Corn, Giant-Reed

Plantains – English Plantain, Great Plantain

Amaranths & Goosefoots – Red-Root Amaranth, Sandhill Amaranth

Alfalfa – Alfalfa, Black Medick

Hemp & Nettles – Hemp (Cannabis), Heart-Leaf Nettle

Cocklebur – Rough Cockleburr

Mild

Clovers – Red Clover, White Clover

Cat-Tails – Broad-Leaf Cat-Tail, Southern Cat-Tail

St. Augustine Grass – St. Augustine Grass

Winter in Flagstaff is colder than much of Arizona, but that doesn’t mean allergy sufferers get a full break. While the harsh mountain winters push most plants into dormancy longer than in the Valley, a few resilient trees begin stirring earlier than expected. Junipers, which are abundant throughout the Flagstaff area, can start releasing pollen in late winter as temperatures begin to climb. Elms and ashes also tend to wake up ahead of schedule, catching many people off guard. If you find yourself sneezing through the end of winter or into early spring, tree pollen getting a head start in the high country is very likely the cause.

Significant

Cedars & Junipers – Ashe’s Juniper
Mulberries – Red Mulberry, White Mulberry, Texas Mulberry
Ashes – Green Ash, Mexican Ash, Texas Ash
Ragweed – Annual Ragweed
Amaranths – Spiny Amaranth

Moderate

Elms – American Elm, Winged Elm

Poplars & Cottonwoods – Eastern Cottonwood, White Poplar

Plantains – Great Plantain, Woolly Plantain

Sorghum & Giant Reed – Johnson Grass, Giant-Reed

Nettles & Docks – Heart-Leaf Nettle, Curly Dock

Mild

Cat-Tails – Broad-Leaf Cat-Tail

Clovers – White Clover

Pollen Calendar

Knowing what’s in the air is the first step to feeling better. In Flagstaff, pollen seasons overlap and shift throughout the year, catching many allergy sufferers off guard. The calendar below gives you a clear picture of when trees, grasses, and weeds are most active across the Flagstaff area and greater Arizona, so you can stay one step ahead of your symptoms.

Peak season

Active (lower levels)

Inactive

Understanding Pollen Levels

None: No pollen levels significant enough to cause symptoms

Low: Most people with allergies won’t experience symptoms

Medium: Many people with allergies will experience symptoms

High: Nearly all people with allergies will experience symptoms

Tips for High Pollen Days

Keep windows closed and use air conditioning
Avoid outdoor activities during peak pollen times (early morning)
Shower and change clothes after being outside
Use a HEPA air filter in your bedroom
Consider starting allergy medications before symptoms worsen

Tired of Checking Pollen Counts Every Day?

Get tested to find out exactly what you’re allergic to. Then start treatment so pollen levels don’t dictate your life.