CT pollen report
New Haven Pollen Report
New Haven sits on Long Island Sound in the heart of southern New England's oak country. Oak and birch bury the city each spring, grasses carry the summer, and ragweed fills the fall until the first frost. The Sound's humidity keeps the growing season lush and the mold season long.
Collection coming soon to New Haven
PollyMap is actively recruiting a verified local partner in New Haven. 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 New Haven
No allergy clinic is reporting from New Haven 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 New Haven
Trees: oak, birch, and maple (April – June)
Oak (Quercus) dominates the canopy, with highly allergenic birch (Betula) and maple contributing. May is the peak.
Grasses: Timothy and bluegrass (June – July)
Lawn and meadow grasses across southern Connecticut pollinate heavily in early summer.
Weeds: ragweed (August – frost)
Ragweed (Ambrosia) fills disturbed soils along the coast, with counts elevated until the first frost.
Mold: Sound-side humidity
Long Island Sound's humidity keeps Alternaria and Cladosporium active through summer, with spikes as leaves fall in autumn.
Pollen patterns in New Haven
In New Haven, tree pollen — including Birch, Oak, Maple — typically dominates from late winter through spring. Timothy grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Top trees
- Birch
- Oak
- Maple
- Beech
- Ash
Top grasses
- Timothy
- Bluegrass
- Orchard
- Rye
Top weeds
- Ragweed
- Plantain
- Pigweed
- Lamb's quarters
Top molds
- Alternaria
- Cladosporium
- Aspergillus
- Penicillium
New Haven 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 New Haven
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in New Haven today?
PollyMap publishes real, microscope-verified pollen counts for New Haven — 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 New Haven right now?
New Haven'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 New Haven?
April through the first hard frost: trees in late spring, grasses in summer, ragweed in the fall, and mold through the humid months.
Why is birch pollen such a big deal in New England?
Southern New England's forests are rich in birch, one of the most allergenic trees in North America. Its May season overlaps with oak, making those weeks the roughest of the year.
Are you an allergy clinic in New Haven? 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 New Haven, 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 New Haven metro — like a franchise territory. New Haven has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in New Haven 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.
New Haven, Hamden, West Haven, and Milford each make natural PollyMap territories. The first allergy clinic in each area becomes its credited pollen expert.
- Your clinic credited on every New Haven 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 New Haven
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