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Preschool corn unit - lots of links and ideas. The grain sorting activity is particularly good.
Montessori-Inspired Fall Activities - activities and Pinterest Boards for many different fall themes.
Montessori-Inspired Halloween Activities at Living Montessori Now (Photo from Counting Coconuts)
Amazing Pumpkin unit ideas...it has EVERYTHING pumpkin (science, literacy, music, art, dramatic play, math, etc). Check it out if you're in a theme based centre or if the children are interested in pumpkins in High/Scope. If you're in Montessori, well, I'm sorry but I have no idea if you could ever incorporate these. Like I said, sorry.