Unit 128

Key navigation features include Haystack Butte and North Rattlesnake Butte, which serve as obvious reference points across the open landscape. The Cucharas River system provides a major drainage corridor running through the central unit, while Horse Creek and Fourmile Creek offer secondary drainage reference points. Turkey Ridge, Black Ridge, and Blue Ridge create ridgeline terrain useful for glassing and orientation.

Graneros Flats and Muddy Flat offer open country for spotting from distance. Madden Canyon, Karrick Canyon, and Sheep Canyon provide recognizable terrain breaks in otherwise rolling country.

The unit spans lower elevations between roughly 4,300 and 6,400 feet, placing it firmly in the plains-to-foothill transition zone. Lower sections are open grassland and sagebrush with scattered cottonwood drainages, while higher areas support pinyon-juniper woodlands and ponderosa scattered across gentle ridges and butte formations. The habitat is predominantly open country with sparse forest cover—expect grassland interspersed with dry washes, arroyos, and canyon bottoms that concentrate vegetation and water.

Seasonal use patterns shift with elk moving to higher ridges in summer and lower flats in winter.

Nearly 1,000 miles of roads network the unit, providing fair accessibility across what is primarily ranchland and agricultural country. The road density is substantial, but much of the accessible terrain is privately owned; public land exists in patches rather than continuous blocks. This checkerboard ownership means hunters must know exactly where public land sits before heading out.

Major population centers (Pueblo to the north, Trinidad to the south) funnel hunting pressure into accessible pockets. Early season pressure tends to concentrate near trailheads and obvious entry points; the vast lower-elevation terrain allows escape from crowds if you're willing to work harder for access.

GMU 128 encompasses portions of Pueblo, Huerfano, Las Animas, and Otero Counties in south-central Colorado. The unit stretches from I-25 on the west to Colorado 167 on the east, bounded north by U.S. 50 business and U.S. 50 near Avondale, and south by Colorado 10. This creates a large rectangular area spanning the transition zone between the plains and the Rocky Mountain foothills. The geography includes Saint Charles, Cuchara Junction, and Trinidad as reference points within and near the unit boundaries.

Water is scattered but present throughout the unit via both natural and irrigation infrastructure. The Cucharas River runs as the primary drainage system, while Horse Creek, Fourmile Creek, and numerous arroyos (Greasewood, Edson, Doyle, Pine) drain the terrain. Several springs dot the ridges and canyon systems—Dime Spring, Whiskey Spring, Duran Spring, and El Hondo Spring are marked reference points.

Multiple reservoirs (Trinidad, Cucharas, David E Farr, Maria, Bradford) provide reliable water for cattle operations and hunting logistics. Lower-elevation creeks may be seasonal, so relying on reservoirs and springs is safer during late season.

GMU 128 holds elk, mule deer, white-tailed deer, pronghorn, moose, bear, and mountain lion across its mixed terrain. Early-season hunting focuses on higher ridges (6,000+ feet) where pinyon-juniper cover concentrates animals; glassing from Turkey Ridge or the butte systems can glass miles of lower country. Mid-season and rut hunting targets canyon drainages—Madden, Karrick, and Sheep canyons concentrate elk moving between feeding and bedding areas.

Pronghorn hunting works open flats in early season. Whitetails use riparian vegetation along creek bottoms and reservoir margins year-round. Water sources (Trinidad and Cucharas reservoirs especially) concentrate animals during dry stretches.

Success depends heavily on accessing public land; scout ownership patterns before your hunt.