Monarchs are easily reared in classrooms. If provided with suitable temperatures, and adequate fresh milkweed leaves or plants, larvae will hatch, grow, and molt, eventually form a chrysalis and emerge as an adult. Small larvae can be raised individually in petri or other small dishes, and larger larvae can be kept on plants in a butterfly box or screen enclosure. We have found that frozen milkweed leaves can be used to feed larvae (thaw it for a few minutes before giving it to the larva), if you do not have a late season source of fresh milkweed. Adult butterflies can be tagged and released about 8 hours after emerging from the chrysalis.
When you order eggs, you will receive detailed rearing information from the supplier.
http://www.monarchlab.umn.edu/