The National Wildlife Federation has some great information on creating a schoolyard habitat. This is the kind of thing you could plan during post-planning to give time for the summer and to have them ready for the fall. There is also a way to certify your school yard habitat. We have two gardens at our school and outdoor classrooms and the students learn so much. I highly recommend considering this at your school. This can be done with all ages.
Another set of ideas for the outdoors - these are for math and writing topics as well as recognizing numbers.
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Groups interested in outdoor