With tourism as engine for socio-economic growth and investment, stakeholders in the tourism industry have considered the need to improve the competencies of its frontliners, such as the skills in English communication which have been identified by studies from non-English speaking countries. With this premise, this study aimed to determine the English language competence, specifically grammatical competence, of tourism frontliners when considered as an entire group, and when grouped according to some variables. Moreover, this study also sought to find out the competency development project that may be proposed. This study involved the 37 tourism frontliners in an eco-adventure tourist destination in Tibiao, Antique, Philippines. The result of the study revealed the following: 1) when considered as an entire group, the tourism frontliners were fairly competent in grammar, as revealed by their scores in the 30-item grammar test 2) when grouped as to sex, the males were fairly competent while the females were competent 3) when grouped as to age, those who were 20 years old and below, and those who were 21-30 years old were competent and those who were 31-40 years old, and those who were above 40 years old were fairly competent 4) when grouped as to educational attainment, those with elementary, and those with high school education were fairly competent and those with technical/vocational education, and those with college education or advanced studies were competent                  5) considering the frontliners other tourism service-related qualifications, those with TESDA certificate were fairly competent, while those without TESDA certificate were competent 6) when grouped according to their type of job, those with eco-adventure related job, those with food and accommodation-related job, and those with transportation-related job were competent while those with health and wellness-related job, and those having two or more types of jobs were fairly competent and 7) considering the length of tourism-related experience, those with less than a year of experience, and those whose experience is 11 years and above, were fairly competent, while those who have one to ten years of experience were competent. Moreover, no significant difference was found between and among the grammatical competence of the tourism frontliners when they were grouped according to the identified variables in the study. Based on the result of the study, the researcher proposed for a language training to the frontliners, specifically on spiel making, and a project on training materials preparation.