Is it allergy season in Maine?

Maine has one of the shortest allergy seasons in the continental US, but the birch peak in May can be genuinely intense. Maple and some alder begin in April; birch peaks in early to mid-May across the state; ash and oak follow through May into early June. The compressed summer brings modest grass pollen in June and July. Ragweed season is milder than most eastern states — Maine is at the northern edge of the ragweed belt — but it peaks in August and September. The heavily forested landscape means birch and other tree pollens are the dominant story, while grass (limited agriculture) and weeds are secondary.

Southern Maine near Portland starts 1–2 weeks earlier than Bangor and Central Maine, and 3–4 weeks earlier than Aroostook County in the far north. The coast benefits from ocean breezes that dilute pollen. Inland river valleys concentrate pollen on still mornings. Northern Maine's potato-farming landscape adds some weed pollen in late summer.

Southern Maine / Portland

Earliest onset — closest to New Hampshire and Massachusetts

Portland and South Portland start the allergy season earliest in the state. Birch peaks in late April to early May, 1–2 weeks ahead of Bangor. The coastal location provides some dilution from ocean breezes. The Greater Portland metro has the densest population and most pollen monitoring data.

Birch · Apr–MayGrass · Jun–JulRagweed · Aug–Sep

Midcoast & Central Maine

Classic Maine birch season — inland peaks are higher

Lewiston, Auburn, and the Midcoast see a textbook Maine allergy season. Birch peaks intensely in early May. The Androscoggin River valley concentrates pollen on calm mornings. Less coastal dilution than Portland means inland counts run somewhat higher during peak weeks.

Birch · May (peak)Maple · AprRagweed · Aug (moderate)

Bangor & Eastern Maine

Later start, similar intensity to central regions

Bangor is at the same latitude as Portland but slightly inland. The season starts 7–10 days later. Birch remains the dominant spring allergen. Eastern Maine's blueberry barrens add modest weed pollen in late summer. The University of Maine area sees the state's most rigorous pollen monitoring.

Birch · MayLate start vs PortlandBlueberry season adds weed pollen

Northern Maine / Aroostook

Latest start — potato country adds weed pollen

The County (Aroostook County) in far northern Maine has the shortest season in the state. Birch doesn't peak until late May or early June. The vast potato farming landscape generates weed pollen from mid-summer disturbed field edges. Very low ragweed compared to southern counties.

Birch · late May–JunPotato farming adds weed pollenRagweed very low

Each row shows a full year of pollen for one region — trees in blue, grasses in green, weeds in amber. Look for where all three rows go quiet at the same time — that's your window.

Oral Allergy Syndrome (also called pollen-food allergy syndrome) causes tingling or mild itching in the mouth when you eat certain raw foods during the relevant pollen season. The proteins in the food are similar enough to the pollen protein that your immune system cross-reacts. Cooking usually deactivates the offending protein, so the same food cooked may cause no reaction.

Birch pollen

Raw apples, stone fruits & nuts

Apples, pears, kiwi, peaches, cherries, plums, almonds, hazelnuts, carrots, celery, parsley

Peak risk April–May in Maine. Birch is more prominent in Maine than in most southern and mid-Atlantic states — the heavily forested landscape means exceptionally high birch counts during peak week. OAS from birch is among the most commonly reported food reactions in New England.

Grass pollen

Tomatoes, potatoes & melons

Tomatoes, potatoes, kiwi, watermelon, cantaloupe, oranges (in some cases)

Peak risk June–July in Maine. Grass pollen is secondary to birch but real. The hay-cutting season in central and western Maine generates elevated orchard grass and timothy pollen. Limited agriculture compared to the Midwest means lower counts than most US states.

Ragweed

Melons & bananas

Watermelon, cantaloupe, honeydew, banana, zucchini, cucumber, sunflower seeds

Peak risk August–September in Maine. Maine is at the northern edge of the ragweed belt — counts are substantially lower than in southern New England and the Mid-Atlantic. Coastal areas and northern Aroostook County have minimal ragweed.

Not medical advice. If you suspect OAS, speak with an allergist — it can sometimes progress, and symptoms that extend beyond the mouth should be evaluated.