The National Oceanic and Atmospheric Administration - Drought Information Center
http://www.drought.noaa.gov/

Colorado State University Drought Information
http://drought.colostate.edu/

Colorado State University's Turf Grass Program
http://csuturf.colostate.edu

Colorado State University's Horticulture and Landscape Architecture
http://hla.colostate.edu

Green Industries of Colorado
http://www.greenco.org