Idaho pollen and allergy seasons

July outlookHigh

Idaho has a spring tree season, heavy grass in early summer, and a sagebrush led weed season in late summer.

Twelve month pollen calendar

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LowModerateHighVery high

Dominant species in July

Grass

Typical peak in July

early-July to late-July

Worst month of the year

June

Best month of the year

January

What is active in July

Grass

High

Cities in Idaho

City	Today	Worst today	Typical in July
Boise	Very Highas of Jul 15	Grass	High
Coeur D'alene	Very Highas of Jul 15	Grass	High
Idaho Falls	Very Highas of Jul 15	Grass	High
Pocatello	Very Highas of Jul 15	Grass	High
Rexburg	Very Highas of Jul 15	Grass	High
Lewiston	Very Highas of Jul 15	Grass	High
Ammon	Very Highas of Jul 15	Grass	High
Mountain Home	Very Highas of Jul 15	Grass	High
Star	Very Highas of Jul 15	Grass	High
Buhl	Very Highas of Jul 15	Grass	High
Sun Valley	Very Highas of Jul 15	Grass	High
Athol	Very Highas of Jul 15	Grass	High
Mullan	Very Highas of Jul 15	Grass	High
Sagle	Very Highas of Jul 15	Grass	High
Weiser	Very Highas of Jul 15	Grass	High
Idaho City	Very Highas of Jul 15	Grass	High
Iona	Very Highas of Jul 15	Grass	High
Challis	Very Highas of Jul 15	Grass	High
Bruneau	Very Highas of Jul 15	Grass	High
Nordman	Very Highas of Jul 15	Grass	High
Sandpoint	Very Highas of Jul 15	Grass	High
Victor	Very Highas of Jul 15	Grass	High
Mesa	Very Highas of Jul 15	Grass	High
Kimberly	Very Highas of Jul 15	Grass	High
Nampa	Highas of Jul 15	Grass	High
Caldwell	Highas of Jul 15	Grass	High
Eagle	Highas of Jul 15	Grass	High
Moscow	Highas of Jul 15	Grass	High
Hayden	Highas of Jul 15	Grass	High
Jerome	Highas of Jul 15	Grass	High
Burley	Highas of Jul 15	Grass	High
Craigmont	Highas of Jul 15	Grass	High
Rathdrum	Highas of Jul 15	Grass	High
Saint Maries	Highas of Jul 15	Grass	High
Malta	Highas of Jul 15	Grass	High
Mccall	Highas of Jul 15	Grass	High
Meridian	Moderateas of Jul 15	Grass	High
Post Falls	Moderateas of Jul 15	Grass	High
Chubbuck	Moderateas of Jul 15	Grass	High
Blackfoot	Moderateas of Jul 15	Grass	High
Garden City	Moderateas of Jul 15	Grass	High
Middleton	Moderateas of Jul 15	Grass	High
Bellevue	Moderateas of Jul 15	Grass	High
Hammett	Moderateas of Jul 15	Grass	High
Filer	Moderateas of Jul 15	Grass	High
Harrison	Moderateas of Jul 15	Grass	High
Parma	Moderateas of Jul 15	Grass	High
Twin Falls	No live reading	Not available	High
Kuna	No live reading	Not available	High
Rockland	No live reading	Not available	High
Fruitland	No live reading	Not available	High
Lapwai	No live reading	Not available	High
Emmett	No live reading	Not available	High
Glenns Ferry	No live reading	Not available	High
Freedom	No live reading	Not available	High
Wendell	No live reading	Not available	High
Payette	No live reading	Not available	High
Orofino	No live reading	Not available	High

Today and worst today come from live readings where available. Typical shows the usual level for this month from the seasonal profile.

The Idaho allergy season

Allergy levels in Idaho peak in June, when grass pollen runs highest. The season moves through tree pollen around March, grass in June, weed pollen such as ragweed in August. Levels start to climb around March. The lowest pollen levels of the year arrive in January.

Common questions

When does allergy season start in Idaho?

Pollen levels in Idaho usually begin climbing in March and reach their highest point in June.

What is the worst month for allergies in Idaho?

June is typically the worst month in Idaho, driven by grass pollen.

When does ragweed season end in Idaho?

Ragweed pollen in Idaho usually fades by the end of September, after the first hard frost in colder areas.

When is the best time for allergies in Idaho?

January usually brings the lowest pollen levels of the year in Idaho.