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

J
F
M
A
M
J
J
A
S
O
N
D
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

CityTodayWorst todayTypical in July
Twin FallsVery Highas of Jul 12GrassHigh
EagleVery Highas of Jul 12GrassHigh
Sun ValleyVery Highas of Jul 12GrassHigh
MiddletonVery Highas of Jul 12GrassHigh
BoiseNo live readingNot availableHigh
NampaNo live readingNot availableHigh
Coeur D'aleneNo live readingNot availableHigh
MeridianNo live readingNot availableHigh
Idaho FallsNo live readingNot availableHigh
PocatelloNo live readingNot availableHigh
CaldwellNo live readingNot availableHigh
Post FallsNo live readingNot availableHigh
RexburgNo live readingNot availableHigh
LewistonNo live readingNot availableHigh
KunaNo live readingNot availableHigh
MoscowNo live readingNot availableHigh
AmmonNo live readingNot availableHigh
Mountain HomeNo live readingNot availableHigh
HaydenNo live readingNot availableHigh
ChubbuckNo live readingNot availableHigh
StarNo live readingNot availableHigh
JeromeNo live readingNot availableHigh
BlackfootNo live readingNot availableHigh
Garden CityNo live readingNot availableHigh
BurleyNo live readingNot availableHigh
RocklandNo live readingNot availableHigh
BuhlNo live readingNot availableHigh
AtholNo live readingNot availableHigh
MullanNo live readingNot availableHigh
FruitlandNo live readingNot availableHigh
SagleNo live readingNot availableHigh
LapwaiNo live readingNot availableHigh
WeiserNo live readingNot availableHigh
CraigmontNo live readingNot availableHigh
RathdrumNo live readingNot availableHigh
Idaho CityNo live readingNot availableHigh
EmmettNo live readingNot availableHigh
IonaNo live readingNot availableHigh
ChallisNo live readingNot availableHigh
BellevueNo live readingNot availableHigh
Glenns FerryNo live readingNot availableHigh
HammettNo live readingNot availableHigh
BruneauNo live readingNot availableHigh
FilerNo live readingNot availableHigh
FreedomNo live readingNot availableHigh
NordmanNo live readingNot availableHigh
SandpointNo live readingNot availableHigh
Saint MariesNo live readingNot availableHigh
WendellNo live readingNot availableHigh
MaltaNo live readingNot availableHigh
VictorNo live readingNot availableHigh
HarrisonNo live readingNot availableHigh
ParmaNo live readingNot availableHigh
PayetteNo live readingNot availableHigh
MesaNo live readingNot availableHigh
OrofinoNo live readingNot availableHigh
KimberlyNo live readingNot availableHigh
MccallNo live readingNot availableHigh

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.