This descriptive research aimed to ascertain English grammar proficiency, based on a written English grammar test, among college freshmen in the four external campuses of West Visayas State University in the municipalities of Calinog, Janiuay, Lambunao and Pototan, in Iloilo, during the school year 2005-2006. A total of 335 students, randomly selected through proportional sampling, participated in this study. The dependent variable was the students' English grammar proficiency. The independent variables include sex, academic achievement, family's economic status, high school of origin, mother's education, father's education, and exposure to English language reading materials. The proficiency test covered nouns, pronouns, verbs, adverbs, adjectives, prepositions, conjunctions, interjections, sentences and usage. Descriptive statistics employed were mean percentages, standard deviations and ranks. The t-test for Independent Samples, One-Way Analysis of Variance and Stepwise Multiple Regression Analysis were the inferential statistics,all set at.05 alpha level. All statistics were computer-processed with the Statistical Package for the Social Sciences ( SPSS ) software. The result showed that the college freshmen had low English grammar proficiency in general; in the ares of nouns, pronouns, adverbs, prepositions, conjunctions and interjection; and with English sentences and usages. The females were significantly more proficient than the males; the high achievers; the students from families with higher economic status significantly more proficient than those from families with lower economic status; those whose mothers had college education significantly better than those whose mother had no college education; those with adequate exposure and moderate exposure significantly better than those with inadequate exposure. Academic achievement, sex and exposure to English language reading materials proved to be significant predictors of the students' general English grammar proficiency as well as of their proficiency with English adverbs. On the other hand, academic achievement, sex mother's education were found out to be significant predictors of the entire group's proficiency of English nouns; sex, academic achievements and father's education with pronouns; academic achievement and sex with verbs, adjectives, prepositions and conjunctions; and sex, academic achievement and family's economic status with interjections. Sex was the only significant predictors of the students' proficiency with English sentences; and family's economic status the only significant predictors of proficiency with English language usage.