Colorado, United States

Boulder, CO Pollen Count Today

View the current allergy index, primary allergen, tree, grass, and weed pollen levels, plus the 5-day pollen forecast for Boulder.

Today's pollen count in Boulder

Today in Boulder, Colorado, the forecasted pollen level is very high with an allergy index of 5. The primary allergen is Birch. Use the forecast below to see whether conditions are likely to rise, ease, or stay steady over the next few days.

AllergyAva shows forecasted pollen levels and allergy risk estimates for Boulder. Actual exposure can vary by neighborhood, weather, and time outdoors.

Current level
Very High
Allergy index
5
Main allergen
Birch

Pollen Level

Very High Risk
5

Pollen Index

Primary Allergen

Birch

Stay indoors when possible. Use HEPA filters and take prescribed medication.

82°

Temp

64%

Humidity

3

Wind mph

Source: Includes pollen data from Google

Updated May 13, 2026 at 6:27 PM ET.

Check pollen in another city or ZIP code

5-Day Pollen Forecast

Best day this week

Today - Very Low

Worst day this week

Fri - Moderate

Today
80°/53°
1
Very Low
Tree0
Grass4
Weed0
Tomorrow
91°/52°
3
Moderate
Tree1
Grass4
Weed0
Fri
84°/60°
3
Moderate
Tree0
Grass5
Weed0
Sat
76°/51°
1
Very Low
Tree0
Grass3
Weed0
Sun
81°/51°
1
Very Low
Tree0
Grass4
Weed0
None
Very Low
Low
Moderate
High
Very High

Allergen Breakdown

Birch
Very High
Grass
High
Maple
Very Low
Oak
None
Cedar
None

Pollen & Allergy Guide for Boulder, CO

Boulder, Colorado residents can experience significant pollen exposure throughout the year. Tree pollen typically peaks during spring months, while grass pollen dominates in summer. Fall brings elevated ragweed levels, which is one of the most common allergens in the region.

When Is Allergy Season in Boulder?

Allergy season in Boulder generally begins in early spring as trees start releasing pollen. The most intense period varies by allergen type. Monitoring daily pollen counts with Allergy Ava helps you plan ahead and manage symptoms proactively.

Tips for Managing Allergies in Boulder

Track your daily pollen exposure, consult with a local allergist for personalized treatment, and consider starting preventive medications 2-4 weeks before your peak allergy season. Indoor air quality management with HEPA filters can also make a significant difference.

Boulder allergy season calendar

Tree pollen

In season now

Spring

Often drives early-season symptoms

Grass pollen

In season now

Late spring to summer

Can rise around lawns, parks, and open areas

Ragweed/weed pollen

Late summer to fall

Major fall allergy trigger

Mold spores

Varies

Often affected by moisture and decaying leaves

Common pollen triggers around Boulder

TriggerTypical seasonWhat to know
Tree pollenSpringOften drives early-season symptoms
Grass pollenLate spring to summerCan rise around lawns, parks, and open areas
Ragweed/weed pollenLate summer to fallMajor fall allergy trigger
Mold sporesVariesOften affected by moisture and decaying leaves

Frequently asked questions about pollen in Boulder

What is the pollen count in Boulder today?

Today in Boulder, Colorado, the pollen level is very high with an allergy index of 5. The main allergen to watch is Birch.

When is allergy season in Boulder, Colorado?

Allergy season in Boulder, Colorado can vary by allergen and weather conditions. Tree pollen often rises in spring, grass pollen becomes more active in late spring and summer, and weed pollen can remain elevated later in the year depending on local climate and vegetation.

How often should I check the pollen forecast in Boulder?

If you have seasonal allergies in Boulder, it is helpful to check the pollen forecast daily during peak allergy periods. Shifts in wind, rainfall, temperature, and humidity can all change local pollen exposure from one day to the next.

What pollen types affect people in Boulder, Colorado?

Boulder residents may be affected by tree pollen, grass pollen, and weed pollen during different parts of the year. The strongest trigger depends on the season, nearby vegetation, and current weather conditions.