Unit 142, Colorado

The unit sits on the southeastern Colorado plains at elevations ranging from approximately 4,300 to 5,742 feet. The dominant landform is flat to gently rolling shortgrass prairie punctuated by rocky hills, mesas, and steep-walled canyons. The Purgatoire River (locally called "Picketwire") carves a canyon 300–400 feet deep through the unit, with numerous tributary arroyos cutting into the uplands. There are no true mountains; the relief is largely plateau-and-canyon topography typical of the Raton Mesa region.

Nearly all of GMU 142 (approximately 99.8%) falls within the Piñon Canyon Maneuver Site, a U.S. Army installation operated out of Fort Carson. Hunting access is managed through Fort Carson's iSportsman platform (fortcarson.isportsman.net). Hunters must: (1) create an iSportsman profile, (2) complete three mandatory online safety briefings — annual recreation safety, UXO hazard training, and fishing/camping safety, (3) purchase an annual recreational permit, and (4) register all firearms and obtain a downrange pass displayed on the vehicle dashboard. Non-DoD card holders must also pass a criminal background check at the Visitor Control Center at Gate 1 at Fort Carson before first access. PCMS is open to recreation (including hunting) on Fridays, Saturdays, Sundays, and select federal holidays only — closed Monday through Thursday. The site is generally closed to all recreation May through August and reopens in September. Specific training areas are periodically closed due to military operations; hunters must check-in and check-out via iSportsman and verify area closures before each visit. Off-road vehicle use is only permitted to retrieve downed game; ATVs are prohibited. Camping is prohibited at PCMS. The Comanche National Grassland (La Junta Ranger District) lies to the north and provides additional public hunting land adjacent to the unit boundary. U.S. Highway 350 runs along the western boundary connecting Trinidad to La Junta.

Primary cover is shortgrass prairie dominated by buffalo grass and blue grama. Pinyon-juniper woodland occupies rocky slopes, canyon rims, and mesa tops. Sagebrush, yucca, and bitterbrush are scattered throughout the uplands. Riparian corridors along the Purgatoire River and its tributaries support cottonwood groves — the only significant tall woody vegetation in the unit. The semi-arid steppe receives 12–16 inches of annual precipitation.

Pronghorn are the most abundant large mammal, with herds historically exceeding 1,300 animals across the shortgrass prairie and mesa uplands — population growth accelerated after cattle grazing ceased when the Army acquired the land in 1983. Elk are present and use the canyon systems and pinyon-juniper edges; the Purgatoire River corridor provides cover and water. Mule deer occupy the pinyon-juniper and canyon country but populations have been intentionally reduced through aggressive harvest as part of a Colorado Parks and Wildlife and Army experiment to control Chronic Wasting Disease (CWD) prevalence; CPW no longer classifies the unit as a trophy mule deer area. Mountain lion are present and the unit falls within a designated CPW mountain lion management zone. Black bear are documented. Wild turkey (Rio Grande) are present. The flat prairie supports large pronghorn concentrations year-round given the lack of severe topographic barriers to winter movement; elk and deer concentrate in canyon habitat particularly during summer heat and winter cold.

1. GMU 142 is unusual in Colorado: nearly all acreage is U.S. Army land (Piñon Canyon Maneuver Site), not NF or BLM. The 99% public figure refers to non-private ownership, but access is Army-controlled and not open like standard public land. 2. No unit-specific tag quotas or per-species draw odds were publicly available from confirmed sources; HuntScore aggregate data (306 hunters, 39.3% overall success across all species in 2022) is the only harvest-level figure obtained. 3. Deer population has been deliberately reduced via a CWD management experiment jointly run by CPW and the Army — trophy quality and overall numbers are not representative of historical levels. 4. GMU 142 is specifically excluded from Colorado's special eastern plains rifle elk season (Sept 1–Jan 31) and uses the standard statewide season structure. 5. Bighorn sheep are referenced by PCMS authorities as an occasional species but could not be confirmed as a regular CPW hunt code for this unit; not included in species_data. 6. Aoudad (Barbary sheep) were referenced in the original draft but could not be confirmed from any authoritative source; removed. 7. 2026 season dates for archery, muzzleloader, and 1st–3rd rifle are confirmed from multiple outfitter/CPW-aligned sources; 4th rifle, plains deer early/late rifle, pronghorn, and mountain lion dates should be verified against the official CPW 2026 Big Game Brochure before hunting.