September Natural Events Calendar

September brings fall to Illinois preserves. Listed here are some of the many natural events occurring throughout Illinois' diverse habitats this month. Look below to find out what our Conservation Director recommends!

  • Blazing stars and Heather aster are in bloom at Nachusa Grasslands.
  • Jewelweed seedpods ripen and White and Black Oak acorns are falling at the Grassy Slough Preserve in the Cache River wetlands as bats begin to enter hibernation and deer rut begins at the Grassy Slough Preserve.
  • Wood ducks are staging and roosting nightly in the lotus beds at Spunky Bottoms.
  • In late September, gentians, asters and ferns bloom at Indian Boundary Prairies.
  • At Emiquon, late migrating shorebirds can be seen on mud flats around Thompson Lake.
  • Large concentrations of great egrets, little blue herons, great blue herons, black-crowned herons and the occasional snowy egret can be seen around lake margins and shallows at Emiquon and Spunky Bottoms.
  • Boltonia decurrens (Federally Threatened) are in full bloom and asters are blooming along the Illinois River at Emiquon and Spunky Bottoms.
  • Blooms of bidens, gentian, asters and goldenrods at the Midewin Tallgrass Prairie.
  • Blooms of purple false fox glove, flat top aster, saw toothed sunflower, rice cut grass, and rough golden rod at Kankakee Sands