The laws in Vermont state that you must enroll your child in school from the day he or she turns 6 years old until he or she turns 16. This HSLDA article details the Vermont state compulsory school age regulations. 

If you want to start homeschooling during the school year and your child is currently enrolled in a public or private school, HSLDA recommends that you formally withdraw your child from that school. If you are going to start homeschooling after the school year is over, and your child is considered enrolled for the following year, we recommend that you withdraw your child before the next school year begins, so that the school does not mark your child as absent or truant.

Vermont law specifically refers to homeschooling in 16 V.S.A. § 11(a)(21) and 16 V.S.A. § 166b. To homeschool under this statute, you’ll need to follow these guidelines. Necessary steps include sending in a written enrollment notice, submitting a narrative describing the content to be provided in each subject area, obtaining acknowledgement of compliance, teaching the required subjects and assessing your child annually.