Accreditation demonstrates Greengate's effectiveness and its ability to provide successful schooling for children.
- Southern Association of Independent Schools (SAIS)
- Southern Associations of Colleges and Schools/AdvancED (SACS)
- Academy of Orton Gillingham Practitioners and Educators (AOGPE)
- International Dyslexia Association (IDA)
- Alabama Branch-International Dyslexia Association
- Huntsville Madison Private Schools Association
- Huntsville Chamber of Commerce