MI pollen report
Ann Arbor Pollen Report
Ann Arbor's nickname is 'Tree Town' — and the trees deliver. The city's dense canopy of oak, maple, and birch buries spring in pollen, the surrounding farm country sends a heavy grass season each summer, and ragweed fills the fall. The Huron River corridor adds humidity that keeps mold active through the warm months.
Collection coming soon to Ann Arbor
PollyMap is actively recruiting a verified local partner in Ann Arbor. Be the first to know — or apply to be the partner.
While we find a local clinic
Test the air at your own home in Ann Arbor
No allergy clinic is reporting from Ann Arbor yet. Until one does, you can order your own PollyKit — a simple air sampler you hang outdoors or indoors. Send it back and the PollyKit Lab shows you exactly what's floating in your air.
- Pollen from local trees, grasses and weeds
- Airborne mold spores
- Dust mites and other indoor allergens
Hang it outdoors
See which pollen and mold are in your yard this season.
Or hang it indoors
Check bedrooms and living spaces for mold, dust mites and more.
What drives allergies in Ann Arbor
Trees: oak, maple, and birch (April – June)
Oak (Quercus) and maple dominate one of the densest urban canopies in Michigan, with highly allergenic birch contributing. May is the peak.
Grasses: Timothy and bluegrass (May – August)
Lawn and pasture grasses across Washtenaw County pollinate heavily in June.
Weeds: ragweed (August – frost)
Ragweed (Ambrosia) thrives in southeast Michigan's farmland, with counts elevated until the first frost.
Mold: river and lake-fed humidity
Huron River humidity and Great Lakes moisture keep Alternaria and Cladosporium active through summer and fall.
Pollen patterns in Ann Arbor
In Ann Arbor, tree pollen — including Maple, Oak, Birch — typically dominates from late winter through spring. Bluegrass grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Top trees
- Maple
- Oak
- Birch
- Ash
- Walnut
Top grasses
- Bluegrass
- Timothy
- Orchard
- Rye
Top weeds
- Ragweed
- Lamb's quarters
- Pigweed
- Plantain
Top molds
- Alternaria
- Cladosporium
- Aspergillus
- Penicillium
Ann Arbor pollen calendar
Typical monthly intensity across the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| tree | ||||||||||||
| grass | ||||||||||||
| weed | ||||||||||||
| mold |
Historical reports
Cities near Ann Arbor
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in Ann Arbor today?
PollyMap publishes real, microscope-verified pollen counts for Ann Arbor — measured from physical air samples. The latest report on this page shows current tree, grass, weed, and mold levels.
Is the pollen count high in Ann Arbor right now?
Ann Arbor's worst stretches are May (oak, birch), June (grasses), and September (ragweed). The measured reports on this page show today's actual levels.
When is allergy season in Ann Arbor?
April through the first hard frost: trees in late spring, grasses in summer, ragweed in the fall, and mold through the humid months.
Does Ann Arbor's tree canopy make allergies worse?
It's a big factor — 'Tree Town' has one of the densest urban forests in the Midwest, so spring oak and birch seasons are intense.
Are you an allergy clinic in Ann Arbor? Claim your territory on PollyMap.
PollyMap is a local authority-building tool for allergy clinics, ENT practices, and any clinic that offers allergy care. By becoming the Official PollyMap Partner for your part of Ann Arbor, your clinic gets credited on real pollen reports, receives ready-to-share weekly content, and becomes the go-to local expert patients trust.
We assign each partner a designated territory within the Ann Arbor metro — like a franchise territory. Ann Arbor has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in Ann Arbor yet. The best areas go to the first clinics that sign up — once one does, that part of town is off the table for everyone else.
Ann Arbor, Ypsilanti, Saline, and Dexter each make natural PollyMap territories. The first allergy clinic in each area becomes its credited pollen expert.
- Your clinic credited on every Ann Arbor pollen report
- Weekly real-sample reports and ready-to-share content under your brand
- Locked territory — competing clinics can't claim your area
- Become the go-to allergy expert in your part of Ann Arbor
Supported by PollyMap sponsors
Your business could be here
Reach local families checking real pollen conditions in their community.
Become a sponsorReport findings are based on reviewed sample data and are not influenced by sponsors.