July 7, 2022

Allergies in Denver: Here's What You Need To Know

Whether you're a newcomer to the Mile High City or a long-time resident seeking relief from seasonal sniffles, this blog serves as your go-to resource for understanding, managing, and thriving amidst Denver's unique allergy ecosystem. From exploring the length of allergy seasons to identifying prevalent allergens and their associated symptoms, we're here to equip you with the knowledge and strategies needed to reclaim control over your health and well-being in the face of allergen-related challenges.

How long is the allergy season in Denver?

Denver tends to have a cool and dry climate that also experiences all four seasons. This means that there are different allergies to be wary of every season. The Denver allergy season typically begins in February and goes through October. However, the most severe allergies in Colorado tend to peak between April through September. To stay on track with the changing allergy season, download our free allergy calendar for Colorado!

What are the most common allergies in Colorado? 

Allergies in Colorado can be a common concern for residents, with various allergens triggering reactions throughout the year. Here are some of the most common allergens you may encounter in Denver: 

Tree Pollen

Denver's landscape is dotted with numerous trees, and during their respective pollination seasons, they can become a source of allergies. Cottonwood and Aspen trees, prevalent in the Denver area, release tiny particles into the air from February through May. These airborne particles can irritate the throat, nose, and eyes of allergy sufferers. Elm trees are abundant in damp areas and along rivers, blooming from February to April. Juniper (Cedar) trees add to the complexity, pollinating in the winter and extending the allergy season. Oak trees, which primarily pollinate from February to May, can trigger severe reactions in people with Denver allergies. These symptoms tend to occur during the spring and sometimes persist into the late summer, potentially affecting individuals sensitive to tree pollen year-round.


Though Colorado offers abundant outdoor activities, residents must also contend with weed allergies. Ragweed and tumbleweeds are common culprits for allergies in Denver, with their pollination season typically running from late July through September, and sometimes even extending into October. While the fall months in Colorado are beautiful, they come with a price in the form of weed allergies. To mitigate the risk, it is advisable to wear a mask when outdoors during this season, as even those who don't anticipate allergies may be affected. Tumbleweeds find a home in Denver's dry and windy areas, thriving from July to October, while sagebrush flowers in mid-August to late September, posing a particular risk to individuals with asthma allergies.


Grass pollen can be a concern for much of the year, from early May through August. The amount of pollen in the air depends on the moisture levels outside, with dry conditions leading to more grains becoming airborne allergens. Kentucky bluegrass, known by various names including June grass and bird grass, releases substantial amounts of pollen during its spring-to-fall pollination season. Ryegrass, another common culprit in Denver allergies, also disperses significant pollen during its flowering season.

Allergy treatments in Denver?

In Denver, Aspire Allergy & Sinus offers a comprehensive range of allergy treatments designed to address both seasonal and environmental allergies. Our clinics are conveniently located in Lakewood, serving the communities of Applewood and Daniels, and we're proud to welcome patients from Golden, Colorado. Additionally, our Castle Rock location, situated just off I-25, caters to the Meadows, Sedalia, and Franktown areas. Kelly Eskew, FNP-BC, provides expert care for children and adults dealing with Denver allergies, as well as sinus conditions, in both the Castle Rock and Lakewood regions. Don't hesitate to schedule an appointment with Kelly at one of our Denver clinics for personalized care and guidance.

Our allergy treatment options include

Allergy Shots (Immunotherapy)

Allergy shots work by gradually desensitizing individuals to allergens by exposing them to small amounts of the offending substances over time. It is an effective means of preventing allergic reactions from occurring in the first place, as opposed to solely treating them after they have already happened.

Allergy Drops (Sublingual Immunotherapy)

Allergy drops are a convenient treatment that allows for at-home administration or on-the-go dosing. Simply place three drops under your tongue, and you're done! Allergy drops have the same treatment length as allergy shots, spanning between three to five years.

ExACT Immunoplasty

Experience a groundbreaking, three-visit treatment designed to swiftly eliminate allergies. Clinically proven to be as effective as allergy shots, ExACT Immunoplasty is a treatment made for rapid relief. 

When is the Denver allergy season?

The annual cycle of Denver allergy seasons unfolds in a sequence that can significantly affect residents and visitors alike. Spring ushers in tree pollen allergies, typically from February to May, with cottonwood, aspen, elm, and juniper trees being the main culprits. As the days grow warmer, weed pollen allergies become prevalent from late July through September, led by the notorious ragweed. Following this, the summer season often brings grass pollen allergies, extending from early May through August, with grasses like Kentucky bluegrass and ryegrass releasing significant amounts of allergens. While Denver enjoys the beauty of fall, the downside is the prolonged weed allergy season, sometimes extending into October. Understanding these distinct allergy seasons is essential for managing allergies and ensuring a comfortable year-round experience in the Mile-High City.

What Are the Most Common Allergy Symptoms in Denver?

Allergies in Denver can manifest with a variety of symptoms, often causing discomfort and irritation. The most common allergy symptoms in Denver include:

Recognizing these common symptoms is essential for managing and seeking appropriate treatment for allergies in Denver.

How to Prepare for Allergy Season in Denver?

Managing allergies in Denver, especially during peak seasons, requires proactive measures and lifestyle adjustments. Here are some tips to help you prepare and manage Denver allergies:

Stay Informed: Keep track of Denver allergy forecasts and stay updated on the Denver allergy index.

Allergen Avoidance: Minimize exposure to allergens by keeping windows closed, using air purifiers, and employing high-efficiency particulate air (HEPA) filters in your home.

Outdoor Precautions: When spending time outdoors, wear sunglasses to protect your eyes and consider using a mask during high pollen seasons.

Timing Matters: Plan outdoor activities during times of lower pollen counts, typically early mornings or late evenings.

Shower and Change: After spending time outside, shower and change your clothes to remove allergens.

Allergy-Proof Home: Regularly clean and dust your home, including carpets and upholstery. Wash bedding in hot, soapy water frequently.

Hydration: Staying well-hydrated can help alleviate some allergy symptoms.

Allergen Immunotherapy: Consider allergy shots or sublingual immunotherapy, as they can offer long-term relief for some individuals.

By adopting these strategies, you can better prepare for and effectively manage your allergies in Denver, allowing you to enjoy the city without the burden of allergic symptoms.

Where to Get an Allergy Test in Denver?

For those seeking reliable and comprehensive allergy testing in Denver, come and see us! With clinics conveniently located in both Lakewood and Castle Rock, we cater to residents in various Denver neighborhoods and surrounding areas. Our state-of-the-art facilities offer a range of cutting-edge allergy testing services, including skin prick tests and blood tests, enabling us to accurately diagnose and address a wide spectrum of allergies. Whether you're looking to uncover the root cause of your allergies or require personalized treatment options, our Denver clinics are dedicated to providing you with the highest standard of allergy care and guidance.

Frequently asked questions about allergies in Denver 

What are some common allergies in Colorado?

Common allergy symptoms in Colorado include sneezing, a runny or stuffy nose, itchy or watery eyes, coughing, fatigue, headaches, skin rashes, shortness of breath, irritated throat, and postnasal drip. These symptoms often result from exposure to allergens such as pollen, dust, and pet dander. If you experience these symptoms, consulting an allergist is advisable for proper evaluation and effective management of your allergies in the Colorado environment.

Are allergies bad in Colorado? 

Allergies in Colorado can vary depending on the individual and the specific allergens they are sensitive to. While Colorado's dry climate and high altitude can offer some relief for certain allergies, the state has its own unique challenges. Pollen from trees, weeds, and grasses, as well as dust mites and mold spores, are common allergens in the region and can lead to significant allergy symptoms, particularly during their respective seasons. Therefore, for individuals with allergies, Denver can present challenges, and it's important to take proactive steps, such as allergen avoidance and proper management, to mitigate symptoms and maintain a good quality of life in this beautiful state. If you have concerns about allergies, it's advisable to consult with an allergist who can provide personalized guidance and treatment options.

When is allergy season in Colorado? 

In Colorado, there are three primary allergy seasons, each associated with specific allergens. The tree pollen allergy season typically runs from late winter to early summer, with trees like cottonwood, aspen, elm, and juniper releasing allergenic pollen, peaking from February to May. Weed pollen allergies become prevalent in late summer and extend into fall, notably driven by ragweed, with its peak from July through September, especially in August. Grass pollen allergies can affect individuals from early spring through late summer, with the peak season occurring from May to August, primarily attributed to grasses like Kentucky bluegrass and ryegrass. However, it's essential to remember that individual experiences may vary, and the timing of these seasons can be influenced by factors such as local weather conditions and altitude. For personalized guidance on managing allergies during these seasons, consulting with an allergist is advisable.

Is Denver a good place to live for allergy sufferers?

Living in Denver with allergies can be manageable, but it does come with some challenges. Pollen from trees, weeds, and grasses is prevalent in Colorado, and the pollen seasons can be quite intense during certain times of the year. This can lead to pronounced allergy symptoms, such as sneezing, congestion, and itchy eyes. Denver is a beautiful city with a lot to offer, and with the right precautions and guidance, many people with allergies lead happy and comfortable lives in this region.

Trust Aspire Allergy & Sinus With Your Denver Allergies

Denver is truly an incredible place to call home and a fantastic destination for vacations. Whether you're exploring the Rockies, taking in the vibrant city life, or enjoying the diverse cultural scene, we want you to experience it all without the added complications of allergies. If you're weary of Denver allergies dictating your daily life and adventures, don't hesitate to take control. Take the first step towards a more allergen-friendly lifestyle by booking your appointment online with us today. Your journey to a life with fewer allergy-related hurdles begins here.

About The Author:

William Storms, MD