Few instruments screen for autism spectrum disorder (ASD) among kindergarteners and older children. The Autism Screen for Kids and Youth (ASKY) is a 30-item parental questionnaire for 4- to 18-year-old children and adolescents available in Arabic, English, and Hebrew. We examined the sensitivity, specificity, and temporal stability of the Hebrew ASKY's categorizations ("probable ASD" versus "probable non-ASD") of 167 autistic and non-autistic 4- to 18-year olds. Algorithm-based categorization following "The Diagnostic and Statistical Manual of Mental Disorders: Fifth Edition" (DSM-5) rules demonstrated 91.8% sensitivity, 71.7% specificity, and excellent test--retest reliability ([kappa] = 0.783, 95% confidence interval (CI) = 0.583-0.983, p < 0.001). Total score-based categorization using a cutoff of 9 demonstrated high receiver operating characteristics area under the curve (AUC = 0.874) and high sensitivity (93.4%), specificity (78.3%), internal consistency (Cronbach's [alpha] = 0.954), and test-retest reliability ([kappa][subscript scores] = 0.674, [kappa][subscript instrument] = 0.783). Discussing both categorization approaches, we show that the ASKY is a promising instrument for ASD screening of older children.