Modification of Custody

Could a child starting Kindegarten be considered a substantial change in circumstance to allow for a modification of the custody arrangement? Particularly because after the child begins Kindegarten, the current visitation arrangement will no longer be feasible, as the two parents live in separate states and the child visits every other month for an extended period with the non-custodial parent.

Yes, the beginning of school would be substantial change in this instance.