The effects of organizational networks on adoption behavior may vary over time in response to institutional environments. We found support for this argument in an analysis of the diffusion of a job search training program among Finnish employment offices. The results indicated that the adoption behavior of collaborative organizations and brokerage position in the local network were related to early adoption of the program. The results further showed that the adoption behavior of structurally equivalent organizations tended to inhibit early adoption of the program. Finally, the results indicated that brokerage position in the whole network was related to non-adoption.