The Plate Boundary Observatory is composed of the geodetic component of the NSF funded Earthscope Project. A total of 852 continuously operating GPS stations are planned to be installed in the Western United States, and Alaska. Of these a total of 140 stations are planned for Alaska. As of November 1st, a total of 106 GPS stations have been constructed throughout Alaska. The 2007 field season, was a busy year for the Alaska office, with a total of 36 GPS stations, and 4 tiltmeters installed. AK Field crews fanned out across the state, from Prince William Sound in the south, to the North Slope well above the Arctic Circle and to the central Aleutian Islands. Crews successfully installed logistically difficult sites in Katmai National Park, Lake Clark National Park, Denali National Park, the Seward Peninsula, and on St. Lawrence Island in the Bering Strait. Specific highlights of the field season include the installation of six GPS stations in Prince William Sound, the installation of three permafrost monuments similar to thermopiles commonly used in arctic construction to provide a stable foundation by inhibiting ground thaw. Additionally, we completed the integration of six existing University of Alaska/Geophysical Institute Denali Fault GPS stations in to the PBO network. Looking forward, 2008 will see the installation of the final 34 GPS stations in the Alaska region, including 12 new volcanic stations on Unimak Island. All construction is planned to be finished by the end of August 2007, at which time the transition from construction to maintenance, and operation will be complete.