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Rye and cereals pollen

Rye and cereals (Secale cereale, and other cultivated grasses) is airborne here from june to july, peaking the turn of June into July. Allergenic potency: high. Cross-reacts with tomato, melon, orange and others.

This is reference information, not a diagnosis and not a treatment plan. A pollen calendar cannot tell you what you are allergic to, and no page can clear a food as safe for you — only the label on the packet in your hand and the clinician who knows your history can do that. Anything beyond mild, short-lived symptoms in the mouth or nose — swelling that affects breathing or swallowing, hives away from the mouth, wheeze, vomiting or faintness — is an emergency question, not a reading question.

● peak weeks · ○ usually airborne. Typical mainland window from the national aerobiology monitoring programmes of the region · checked 2026-09-06

Where it grows here

Rye is the one cultivated cereal that is genuinely wind-pollinated and cross-fertilising, and it is grown across Estonia, Latvia, Lithuania, Poland and southern Finland on a scale that makes it an agricultural pollen source in its own right. Wheat, barley and oats are largely self-pollinating and release far less into the air.

When it is in the air

Rye flowers for roughly a week to ten days at the turn of June into July, straight into the wild grass peak. For someone living beside arable land in the Baltic, that week can be the single worst of the year, and it is invisible on any calendar built from wild grasses alone.

What it feels like

Identical to the grass season and often more intense while a nearby field is flowering, because the exposure is concentrated and local rather than regional.

What it cross-reacts with

Rye pollen allergens are homologues of the timothy allergens, so rye and meadow grass cross-react thoroughly and are usually a single sensitivity. Reacting to rye pollen in the field is not the same as reacting to rye bread on the table: baked cereal protein is a different exposure through a different route, and rye flour allergy is mainly an occupational problem for bakers.

Related pollens: all wild grasses, and the other cereals.

Foods reported to cross-react:

TomatoMelonOrange

A cross-reaction is not the same as a food allergy that started with food, and the difference decides how serious it is. Read how oral allergy syndrome works before drawing conclusions from this list, and note that several of these foods also appear on the fourteen declarable EU allergens for entirely separate reasons.

Named allergen molecules: Sec c 1 and Sec c 5, homologues of the timothy major allergens. These are the official WHO/IUIS names, and they are what a component-resolved blood test reports.

What actually helps

Rye is not separately forecast. If a bad week each year lines up with a neighbouring field turning from green to grey-brown, that is the explanation, and it is worth planning around: the flowering window is short and predictable, and it is the week to keep windows shut on the field side of the house.

What gets misread

People who react during the rye flowering week often conclude they must avoid rye bread. Pollen allergy and food allergy to the same plant are separate conditions with separate proteins, and cutting out bread on the strength of a summer field is not a decision to take without a clinician looking at it.

Sources: Regulation (EU) No 1169/2011, Annex II · Commission Implementing Regulation (EU) No 828/2014 (gluten claims) · WHO/IUIS Allergen Nomenclature · season windows from the national aerobiology monitoring programmes of Estonia, Finland, Sweden, Denmark and Norway · cross-reaction patterns paraphrased from the allergy literature and EAACI material · checked 2026-09-06

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