In Multi-tiered System of Support (MTSS) and Response to Intervention (RTI) models, the reading achievement of English Learners (ELs) is assessed multiple times during the school year to monitor students' progress toward meeting grade-level reading standards. Most MTSS/RTI frameworks do not include a comparable system for assessing oral language development. The English Learner Oral Narrative Scale (ELONS) was developed as an informal, criterion-referenced instrument to assess the personal narrative skills of ELs (i.e., skills in recounting personal experiences). The ELONS was piloted with 28 third grade ELs in a transitional bilingual education program to describe participants' personal narrative skills and to explore relationships between narrative skills and reading achievement. Mean scores were at the Advanced level for English global narrative proficiency and vocabulary, grammar, and fluency; mean ratings for oral comprehension and pronunciation were at the Advanced High level. Twelve of 28 ELs produced Spanish narratives of sufficient length to score. Mean global and subskill scores were at the Advanced level except for fluency (Intermediate level). ELONS global proficiency scores showed moderate correlations to state assessments of English language proficiency and English reading. Implications for oral language assessment in MTSS/RTI frameworks and future research directions are discussed.