May. Chestnut pollen season extends from May to July. Facts about Beech, Chestnut, and Oak Beech trees are wind- pollinated . Beech pollen closely resembles oak pollen in morphology . Chestnut trees are insect-pollinated.
Oaks are wind-pollinated.
The pollen is very light and abundantly produced by all species. Oaks outrank any other group of trees in Missouri forests in number of species . There are about 60 species native to the United States. Beech, Chestnut, and Oak allergenicity Beech pollen plays only an insignificant role in causing hay fever. More cases of hay fever are attributed to oaks than to any other tree.