Pollen Count Denver — What You Need to Know
The pollen count in Denver peaks in April–September. High altitude compresses pollen seasons in mountain states, but counts can be intense during peak weeks.
Why Is Pollen High in Denver?
The primary allergen is Mixed Trees — a mix of oak, maple, birch, and elm pollen peaks throughout spring. Pollen spikes on warm, dry, and windy days. Rain temporarily clears the air, but counts rebound fast.
Pollen Season in Denver
- Tree pollen — starts in early spring, peaks April–May. Birch, oak, and cedar are the biggest triggers.
- Grass pollen — peaks late spring through early summer. Affects over 40 million Americans.
- Ragweed — August through October. One plant releases a billion grains per season.
Frequently Asked Questions
What is the pollen count in Denver today?
The current pollen count in Denver is updated every 12 hours using live data. Levels are rated Low, Moderate, High, or Very High based on pollen concentration in the air. Select the live badge above for today's reading.
What type of pollen is high in Denver right now?
The primary allergen in Denver is Mixed Trees. Peak pollen season in Denver runs from April–September. The 'Active Allergens' section above shows which specific pollens are currently elevated.
When is pollen season in Denver?
Pollen season in Denver typically peaks in April–September. Tree pollen starts in early spring, followed by grass pollen in late spring through summer, and ragweed from August through October.
What should I do when pollen is high in Denver?
On high pollen days in Denver: check the forecast before going outside, schedule outdoor activities for the afternoon (pollen peaks 5–10 AM), keep windows closed and use AC, take antihistamines before exposure rather than after symptoms start, and shower after spending time outdoors to remove pollen from skin and hair.
How accurate is the pollen forecast for Denver?
The pollen forecast for Denver is based on the Google Pollen API, which combines real-time sensor data, weather forecasts, and plant biology models. Forecasts are updated every 12 hours and are generally accurate within 1 level (e.g., Moderate vs. High). Actual counts can vary by neighborhood depending on local vegetation.