Our third graders are currently finishing up their exploration of odd and even in the Mathematical Thinking book for grade 3. One of my colleagues posted the question on our grade level email about "Is zero even or odd?" She and her students had had a very engaging discussion about this topic. In the process of refining the definition for odd and even with my third graders the question came up as well.
We would love to get other people's thoughts and student experiences on this topic. Thank you :O)