The Greg Mastrion Golf Course at City Park in Westminster, Colorado, is a municipal facility designed by Frank Hummel and opened in the mid-1990s. The course serves the northwest Denver metropolitan area and represents the city's commitment to accessible public golf. Hummel, a Colorado-based architect, created a layout that works within the relatively flat terrain characteristic of the Front Range piedmont, incorporating water features and strategic bunkering to define holes and add challenge to what might otherwise be straightforward golf. The course plays across open parkland with views of the Rocky Mountains to the west. Water comes into play on several holes, and mature cottonwoods and other plantings have developed over the decades to frame fairways and provide definition. The design emphasizes playability for a range of skill levels while offering enough length and hazard placement to test better players. As a municipal course, it accommodates high rounds of play and serves both regular local golfers and visitors seeking affordable options in the Denver area. The facility is named after Greg Mastrion, a figure associated with Westminster's parks and recreation development, reflecting the course's role as a community amenity rather than a private club. The course includes a practice area and clubhouse services typical of well-maintained municipal operations. It remains a steady option for everyday golf in a region with numerous public and semi-private courses competing for rounds.