Criminologists have long noted that social networks play a role in influencing residents' fear of crime, but findings vis a vis the exact nature of that role have been mixed. More social ties may be associated with less fear of crime through their role in collective action, trust, and emotional support, but also with more fear of crime because of their role in the diffusion of information on local crime patterns. In what follows, we suggest temporal and spatial distinctions in how social ties matter for fear of crime with respect to these different mechanisms. Analysis of data from a large scale egocentric network study in Southern California provides evidence for these claims.Keywords: neighborhoods, social networks, spatial effects, time of day, fear of crime John R. Hipp is a Professor in the departments of Criminology, Law and Society, and Sociology, at the University of California Irvine. His research interests focus on how neighborhoods change over time, how that change both affects and is affected by neighborhood crime, and the role networks and institutions play in that change. He approaches these questions using quantitative methods as well as social network analysis. He has published substantive work in such journals as American Sociological Review, Criminology, Social Forces, Social Problems, Mobilization, City & Community, Urban Studies Fear of crime is a long-standing policy issue of great importance in the U.S., and a large body of literature has emerged on the question of its determinants (Ferraro, 1995;Skogan and Maxfield, 1981;Warr, 1990). One recurrent theme in this literature is that social networks play an important role in influencing residents' fear of crime (e.g., see Bursik and Grasmick, 1993); however, there is considerable debate about the nature of that role. For instance, residents who have more local alters might have more information about criminal activities in the area and hence express more fear, but residents with more local alters might also perceive more potential for collective action in the neighborhood, and therefore express less fear (Bursik and Grasmick, 1993;Skogan and Maxfield, 1981).1 The importance of alter locations for the types of ties ego is likely to have to them, and the types of exchanges taking place through those ties, suggests that the spatial dimension of network structure (itself a topic of growing interest e.g., see Butts et al., 2012) may help disambiguate the relationship between personal networks and fear of crime. In particular, we posit that different mechanisms of social ties for fear of crime have distinct spatial implications. As most research in this area either ignores space or implicitly presumes that alters are only of interest when located in the area nearby ego, little consideration has been given to the effects of alters who are located farther away. In this paper, we examine alter distance on ego's fear of crime, explicitly testing for the effects of both proximate and distant alters.While the spatial distribution of alters ma...