Crestline is a mountain community in the San Bernardino Mountains of San Bernardino County, California, centered on the shores of Lake Gregory. A census-designated place rather than an incorporated city, it is home to about 11,650 residents and sits within the San Bernardino National Forest at an elevation that brings four distinct seasons. Its location near the base of the mountains makes it one of the most accessible resort towns in the range, closer to the Inland Empire than neighboring Lake Arrowhead. The community traces its resort roots to the early twentieth century. In 1906, a group of San Bernardino investors purchased 630 acres in the mountains, and in 1917 the Pacific Electric Railway built a summer vacation camp for its employees, helping establish Crestline as a getaway destination. Lake Gregory was developed in the late 1930s by Arthur Gregory as a deliberately public resource, a distinction that set it apart from many of the region's private lakes. That public-access ethos still defines the community today. Crestline's economy is largely tourism-driven, with Lake Gregory, historic Old Town, and the surrounding national forest drawing visitors year-round. The community experiences a true four-season mountain climate, with cool, pine-shaded summers around the lake and winter snow that brings snow-play visitors, a sharp contrast to the desert communities below the mountains. Historic Old Town and the Lake Gregory Boulevard corridor provide a walkable commercial and social center, with antique and hometown shops, a farmers market, and summer live music. Housing consists primarily of mountain cabins, A-frame homes, and lakefront retreats, along with full-time residences tucked among the pines. Students attend the Rim of the World Unified School District, and access comes via State Route 18, the Rim of the World Highway, with State Route 138 leading into town. For buyers seeking a four-season mountain setting within commuting distance of the Inland Empire, Crestline offers an approachable, forest-oriented option.