You can start to renew your certification from six months before its expiration date to one year after it has expired. If you hold multiple valid and renewable certificates, you may renew them all at the same time.
If a renewable certificate has been expired for more than two years but less than ten years, it may be eligible for renewal through the experienced educator option. Meanwhile, emergency certificates are granted upon request by a superintendent of a school district or charter school. An emergency substitute certificate is for temporary certified teacher absences, while an emergency teaching certificate is a contract for limited teaching duration.