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Crop booms in forest frontiers are a major contributor to deforestation and global change. Because of their nonlinearity, intensity, and unpredictability, booms are specific instances of land change, namely land system regime shifts, which require an analysis going beyond that of their drivers or individual actors' decisions. So far, the combined effect of behavioral dynamics at the household, village, and higher levels, which are often mutually-reinforcing, have not been considered in the empirical analysis of crop booms. In this paper, we aim to further the understanding and the theory behind the dynamics of crop booms and land regime shifts. We focus on the smallholder-driven northern Laos rubber boom and analyze two case study areas with different intensity of rubber expansion. We use a combination of household surveys and interviews with villagers, government officials and private sector actors to analyze the preconditions, triggers and reinforcing effects at household and higher levels that help explain the timing and extent of the boom. In particular, we focus on the role of information transmission and imitation in household decisions to adopt and expand rubber. Our findings show that the rapid expansion of rubber in northern Laos was in part the result of household decisions spurred by economic and policy triggers that changed the real and perceived benefits of growing rubber. In addition, there were higher-level and mutually-reinforcing dynamics, such as the conversion of village communal forests, a rush for land, and individual behavior contingent on others', including imitation. The transmission of information through social networks played a key role in rubber adoption decisions, but the diffusion of new norms and values was also important and may have accelerated adoption decisions. Rubber adoption and expansion decisions thus had normative and informational, as well as knowledge-based and imitation components.