Taytay Rizal is known as the “Garment Capital of the Philippines” and is very popular among bargain-hunting shoppers. The garment industry is a major contributor to municipalities’ economic growth. The emergence of fast fashion trends has made the garment business in the municipality very lucrative. The industry, however, is highly competitive, necessitating efficient management of costs, schedules, and resources. The Critical Path Method (CPM) is an operation research technique that is useful for managers in managing projects and creating accurate project schedules. It is very useful in making optimal decisions in scheduling and determining critical activities to ensure the project’s earliest completion. This study determines the project duration, costs, and critical path for a garment business startup using the POM-QM application for Windows. A descriptive research method was used where data were collected through literature reviews, direct observation, and interviews with garment shop owners and garment subcontractors. Based on the results of the study, it can be concluded that the use of the critical path method is necessary to complete the garment business project on time. The entire project will require 96 days of completion in normal time, and a 15.67% increase in the garment business project costs was observed to shorten the project duration to 52 days. This study is limited to garment shop owners and garment subcontractors in Taytay Rizal and is further limited to garment business projects for ladies’ blouses and dresses.