Tree pollen (Hazel, Alder, Poplar, Ash, Birch & Oak): Mid March to Mid May.
Grass pollen (Foxtail, Oat, Dogstail, Timothy & Meadow grass): Mid May to July.
Weed pollen (not the kind you smoke): Late June to Mid September.
Generally speaking warm air rises and cold air sinks so warm air carries pollen up into the atmosphere and cold air (and rain) brings it down. This translates into the hours between sunrise and sunset as being the worst for allergy sufferers.
The estimates may be off by a month because winter 2018 decided to hang on for an extra month.
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