Boise Pollen Levels Spike After Brief Allergy Relief

The allergy capital of the nation is back to 'extreme' levels of tree pollen.

Apr. 7, 2026 at 11:35pm

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A minimalist design in the style of Keith Haring where a tree branch with leaves is defined entirely by glowing, vibrant neon lines against a deep, dark background, emphasizing the shape and energy of the plant.Boise's seasonal allergy woes are highlighted by the city's high pollen production, as seen in this glowing, neon-outlined tree branch.Boise Today

After a few days of seasonal allergy relief, pollen counts in Boise, Idaho have spiked back to 'extreme' levels, according to local allergy experts. The Boise Valley Asthma & Allergy Clinic reported a jump from 95 grains of pollen per cubic meter of air on April 3 to 720 grains per cubic meter on April 7, with trees like cottonwoods, maples, and junipers contributing the most to the high pollen production.

Why it matters

Boise is known as the 'allergy capital of the nation' due to its high pollen levels, and the recent spike in pollen is likely causing significant discomfort for many residents who suffer from seasonal allergies. Understanding the seasonal patterns of pollen production in the area can help allergy sufferers better prepare and manage their symptoms.

The details

The pollen count in Boise dropped to 'high' levels on April 3 after a few days of storms and chilly weather, but warm and sunny conditions over the weekend led to a resurgence in pollen production from local trees. The Boise Valley Asthma & Allergy Clinic reported that cottonwoods, maples, junipers, birches, elms, and oaks are the main contributors to the high pollen levels in the Treasure Valley region.

  • On March 31 through April 3, pollen counts in Boise dropped due to thunderstorms, snow, and chilly winds.
  • On April 2, the pollen count in Boise was 173 grains per cubic meter of air, still considered 'extreme'.
  • On April 3, the pollen count in Boise dropped to 95 grains per cubic meter of air, entering the 'high' level.
  • On April 7, the pollen count in Boise spiked to 720 grains per cubic meter of air, an increase of 625 grains in just a few days.

The players

Boise Valley Asthma & Allergy Clinic

A local allergy clinic that monitors and reports on pollen levels in the Treasure Valley region.

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What’s next

The Weather Channel anticipates pollen counts for Boise to remain high on Wednesday, April 8, and Thursday, April 9, so allergy sufferers should continue to take precautions.

The takeaway

This case highlights the challenges that Boise residents face with seasonal allergies, as the city's high pollen levels can cause significant discomfort for many. Understanding the seasonal patterns and taking preventative measures like checking pollen reports and avoiding the outdoors when levels are high can help allergy sufferers better manage their symptoms.