Pollen Season Calendar — Louisville
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Tree pollenGrass pollenRagweed
Peak pollen season in Louisville: April–September
Pollen Count Louisville — What You Need to Know
The pollen count in Louisville peaks in April–September. The Southeast has one of the longest allergy seasons in the country, often running February through October due to its warm, humid climate.
Why Is Pollen High in Louisville?
The primary allergen is Oak — oak trees release enormous amounts of fine pollen — a leading cause of spring allergies across the US. Pollen spikes on warm, dry, and windy days. Rain temporarily clears the air, but counts rebound fast.
Pollen Season in Louisville
- 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 Louisville today?
The current pollen count in Louisville 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 Louisville right now?
The primary allergen in Louisville is Oak. Peak pollen season in Louisville runs from April–September. The 'Active Allergens' section above shows which specific pollens are currently elevated.
When is pollen season in Louisville?
Pollen season in Louisville 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 Louisville?
On high pollen days in Louisville: 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 Louisville?
The pollen forecast for Louisville 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.