Teach preschoolers about Halloween safety with your bulletin board. Split the board in half, with one half labeled "Safe" and the other "Unsafe." Create a similar scene on each side. On the safe side, post pictures of children who are wearing sneakers, carrying flashlights and walking with their parents. On the unsafe side, show children wearing too-long costumes and masks they can't see out of. Show these children running away down the street and being too far from their parents.
Since Halloween is on the last day of the month, you can create a Halloween-themed countdown that will last for all of October and will teach children to count to 31. Cut out a large piece of paper shaped like a treat bag and tack it to the board. Cut out smaller pieces of paper that look like candy and number them with one through 31. Line up the candies along the bottom of the board. At the beginning of each day, move that day's piece onto the bag, then have children count the pieces of candy in the bag.
Preschoolers are scared easily, so create a Haunted House scene that's more silly than scary. Hang a cut-out of a house with plenty of windows in the center of the board, then cut out a variety of Halloween shapes and creatures. You can create spiders, monsters and ghosts, but give each one a silly twist. For instance, put shoes on the spider and make friendly, waving monsters. Arrange these creatures around the outside of the house. Cut out a small picture of each child's face, then hang the pictures in the house's windows.
Preschoolers may only remember one previous Halloween, or this year could be their first true Halloween experience. Make a bulletin board featuring each child's favorite thing about the holiday, or have children choose one thing that they're looking forward to about Halloween. Give each child a half piece of paper and ask her to draw a picture of her favorite thing. Teachers can then go around, find out what each child has drawn and write it on the bottom of her paper. Hang them all under a banner saying "What We Love About Halloween."