The mountain's history under its current name is less than eighty years old. During the Qing dynasty, officials who feared thieves stealing the area's rich sulfur deposits repeatedly set fire to the slopes, keeping them treeless and bare — hence the original name, Cao Shan, Grass Mountain. The colonial-era Datun National Park was formally established here on December 27, 1937, designated by Japanese Governor-General Seizō Kobayashi — the first national park on the island during the Japanese period. In 1950, President Chiang Kai-shek renamed the mountain Yangmingshan to honor the Ming dynasty Neo-Confucian philosopher Wang Yangming, whose teachings on moral self-cultivation Chiang admired. The renaming was as much political as philosophical: Grass Mountain was where Chiang had built his summer retreat, the Grass Mountain Chateau, and a new name lent the place a more dignified resonance.

Andesite bedrock underlies the entire park, the hardened remnant of eruptions that built the Tatun Volcanic Group over the past two million years. The geology is not merely historical. At Xiaoyoukeng, a post-volcanic landscape on the northwestern flank of Seven Star Mountain at 805 meters elevation, sulfur crystals crust the ground around active fumaroles, and hot springs bubble from fractured rock. Hikers ascending Seven Star Mountain from the Xiaoyoukeng parking lot pass yellow sulfur deposits and venting steam on their way to the 1,120-meter summit. Recent scientific surveys have identified a magma body beneath the mountain, upgrading its status from dormant to potentially active — a fact that sharpens the experience of standing in this landscape and watching the ground breathe.

The park's elevation spans only 200 to 1,120 meters — modest by most national park standards — yet the range supports extraordinary biological variety. Within those 11,455 hectares grow 1,360 species of vascular plants, from subtropical monsoon rainforest at lower elevations to temperate broadleaf forest and montane grassland near the summit. Menghuan Pond shelters Taiwan isoetes, an aquatic fern found nowhere else on earth. Mt. Datun draws butterfly watchers from May through August to observe 168 species, including members of the swallowtail, danaid, and brush-footed families. The park also hosts 122 bird species, and semi-feral cattle still roam Qingtiangang, a high grassy plateau, where they have lived since agricultural communities once grazed animals on the mountain.

Every spring, Taiwan cherry trees — Prunus campanulata, with their distinctive deep-pink, bell-shaped flowers — draw crowds of visitors to Yangmingshan for what has become one of Taipei's most beloved seasonal events. The blooming peaks in late February and early March, earlier than Japanese cherry varieties, carpeting roadsides and trailheads in color. But the park's human history goes deeper than scenic tourism. The Chung-Shan Building served as the meeting place for the now-defunct National Assembly of the Republic of China. The home and grave of Lin Yutang — essayist, novelist, and one of the most widely read Chinese authors of the twentieth century — stands on the mountainside. Wuchih Mountain Military Cemetery holds the remains of soldiers from the Republic of China Armed Forces. The graves of Sun Fo, son of Sun Yat-sen, and Homer Lea, an American military strategist who advised the early Chinese revolutionary movement, are also found within the park's boundaries.

Yangmingshan's climate is shaped by its position at the edge of the Taipei Basin, where cold, moisture-laden northeasterly winds from the Siberian High pile up against the mountain in winter, producing heavy fog and rain that can last for weeks. Summers are warm and humid, with typhoon season running June through October. The park's Anbu weather station regularly records among the highest annual rainfall figures in Taiwan. This persistent moisture feeds the cloud forest atmosphere that gives Yangmingshan its distinctive character — mossy boulders, dripping tree canopies, sudden clarity when the wind shifts — and is a large part of what makes the Urban Quiet Park designation feel earned.