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Phoenix Pollen Report

Stay informed about local allergen levels and plan your day accordingly. Our pollen reporting is monitored and interpreted by Lindsey, a board certified family nurse practitioner specializing in allergy and immunology, ensuring the information is clinically relevant and reliable for your health decisions.

Today's Pollen Forecast

Moderate
Pollen Index
Overall Pollen Level
Last Updated: 05/14/26

Current Allergen Breakdown

Tree Pollen

Moderate
Pollen Level
Pine (6), Ash/Olive (3), Mulberry (1), Palo Verde (5), Mesquite (1)

Grass Pollen

Low
Pollen Level
Bermuda Grass, Orchard Grass

Weed Pollen

Low
Pollen Level
Asteraceae (1), Ragweed

Mold

Low
Pollen Level
Alternaria (1)

What Pollens are in the Air

Spring is one of the most challenging seasons for allergy sufferers in Arizona. As temperatures warm up, trees kick off the pollen season in full force: oaks, mulberries, ashes, and junipers are among the biggest culprits, releasing large amounts of pollen that can trigger sneezing, itchy eyes, and congestion. If you've noticed your symptoms flaring up between February and May, tree pollen is likely to blame. Grasses and ragweed 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 & Docks – Heart-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. Bermuda grass is one of the most widespread triggers in Arizona and peaks during the warmer months. Ragweed continues to be a concern, and amaranths (a common desert weed) thrive in the summer heat. For those who've never connected their mid-year sniffles to allergies, summer grass and weed pollen 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 Arizona. Grasses like Bermuda and Orchard Grass remain active well into the season, and amaranths continue to release pollen through the dry autumn months. Privets, popular ornamental shrubs found in many neighborhoods and gardens, also peak in fall and are a surprisingly common trigger that many people don't think to watch out for. If your symptoms tend to linger past summer, fall allergens 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 Arizona is milder than in most of the country, and unfortunately, so are the allergens. While many plants go dormant, a few key trees get an early start: Ashe's Juniper (known locally as "cedar fever") and mulberries can begin releasing pollen as early as December or January, catching many people off guard. Elms and ashes also stir up earlier than expected. If you find yourself sneezing through the holidays or into the new year, winter tree pollen 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 Arizona, 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 Phoenix valley and greater Arizona, so you can stay one step ahead of your symptoms.

Peak season Active (lower levels) Inactive
JanFebMarApr MayJunJulAug SepOctNovDec
Trees
Grasses
Weeds
Mold

Understanding Pollen Levels

  • Low Most people with allergies won't experience symptoms
  • Medium Many people with allergies will experience symptoms
  • High Most people with allergies will experience symptoms
  • Very 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