Ragweed is very low in Greenville today.

No mold level

Google’s index covers tree, grass and weed pollen only, so there is no mold level for Greenville on this page. The National Allergy Bureau publishes pollen and mold counts measured at its stations. Our guides cover common molds such as Alternaria, Cladosporium and Aspergillus.

No indoor allergens

The forecast doesn’t cover allergens indoors either: dust mites, cockroaches, mice, cats and dogs. Our guides explain each one, starting with dust mites and cats.

Asthma in Greenville

An estimated 9.6% of adults in the city of Greenville have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 8.6% to 10.7%). It is a statistical estimate from national survey data, not a count.

Allergists in the Greenville area

13 allergists enrolled in Medicare practice in the Greenville area: 1.28 for every 100,000 people, more than the 1.22 across the US. The count doesn’t show how soon you can get an appointment. See the doctors listed in the Greenville area, or how every state and metro compares.

AllergyNest count from CMS’s Doctors and Clinicians file (October 2026) and Census population estimates for 2025.

Moist air forced up the mountains of South Carolina’s far northwest brings about 80 inches of precipitation a year near Lake Jocassee.² Most of the Upstate averages 45 to 55 inches, and the Appalachian Mountains to the north and west partially shield the state from cold air masses.² At the Greer weather station, close to 50 inches falls in a typical year, and the freeze-free season lasts about 224 days.¹

A 2024 county assessment puts Greenville County’s tree canopy at 38 percent, across land that runs from dense urban development in the south to rural, mountainous and forested terrain in the north.³ Red maple is one of the first trees to flower in early spring, and in North and South Carolina it blooms from January to March.⁴ Clemson Extension traces most of the yellow-green coating on cars and walkways from late March through April to pine trees.⁵ The same article names birch, oak, elm and juniper among the usual culprits behind spring allergies, rather than pine.⁵

Two species of ragweed occur in South Carolina, common and giant ragweed, and each may release an abundance of wind-blown pollen.⁶ They bloom at the same time as the state’s goldenrods, which typically begin in mid-to-late August and often last into early October.⁶