The present invention encompasses heterologous fusion 5 proteins comprising a hyperglycsoylated G-CSF analog fused to proteins such as albumin and the Fc portion of animmunoglobulin which act to extend the in vivo half-life of the protein compared to native G-CSF. These fusion proteins are particularly suited for the treatment of conditions 10 treatable by stimulation of circulating neutrophils, such as after chemotherapy regimens or in chronic congenital neutropenia.