South Dakota pollen and allergy seasons
South Dakota has a late spring tree season, grass in early summer, and a heavy ragweed season in the fall.
Twelve month pollen calendar
What is active in September
Cities in South Dakota
No tracked cities yet for South Dakota.
Today and worst today come from live readings where available. Typical shows the usual level for this month from the seasonal profile.
Pollen is only half of what's in the air. See today's air quality in South Dakota for ozone, dust, and smoke readings by city.
The South Dakota allergy season
Allergy levels in South Dakota peak in September, when ragweed pollen runs highest. The season moves through tree pollen around April, grass in June, weed pollen such as ragweed in September. Levels start to climb around April. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in South Dakota?
Pollen levels in South Dakota usually begin climbing in April and reach their highest point in September.
What is the worst month for allergies in South Dakota?
September is typically the worst month in South Dakota, driven by ragweed pollen.
When does ragweed season end in South Dakota?
Ragweed pollen in South Dakota usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in South Dakota?
January usually brings the lowest pollen levels of the year in South Dakota.