The effectiveness of several community-based early intervention programs for young children (2.5-6.5 years old) with autism spectrum disorder in Greece were compared, as they occurred in a community setting over a nine-month period. There were few differences in functioning change between programs, but applied behavior analysis (ABA) was most effective in improving intellectual functioning. Child age did not predict outcomes, although children fared better with ABA if they had started at a younger age, and there was little impact of this factor on the outcomes for the other programs. The slight advantage for ABA programs may need to be weighed against the potential costs of the program.