This article argues that nostalgia forms a crucial part of the imaginary that drives frontier economies—not in contradiction but alongside the future-oriented imaginaries of speculation, anticipation, and appearances. Drawing on ethnographic research conducted across three key locales—Pianma, Mong La, and the Golden Triangle Special Economic Zone—this study introduces the concept of “frontier nostalgia” to analyze how these spaces function as sites of both economic opportunity and memory. While aspirations for prosperity drive individuals to engage with these dynamic zones, their lived experiences are marked by significant historical residue, creating a poignant longing for past vibrancy—and particularly for a form of hypersociality that characterize(d) frontier spaces. By examining the lived realities of Chinese migrants, the paper argues that nostalgia is not merely a counterpoint to forward-looking anticipation. Instead, it complements future-making practices and imaginaries by highlighting the complex emotional landscapes that characterize frontier encounters, hence constituting particular frontier subjectivities. In Pianma, remnants of a timber boom evoke a sense of melancholic yearning for lost sociality; in Mong La, vibrant social interactions coexist with developmentalist dynamics; and in the burgeoning Golden Triangle SEZ, rapid transformation echoes and actively resemble past experiences. Ultimately, this comparative analysis emphasizes how nostalgia shapes both individual identities and collective memories within these transient spaces, shedding further light on the experience of life on the frontier.