Unit 37, Colorado

Elevation ranges from roughly 7,444 feet along the Colorado River valley near Kremmling to 14,265 feet on Fourteener summits including Quandary Peak (Ten Mile Range) in the south. The unit is characterized as steep to very steep throughout, with the Continental Divide and Gore Range Divide encircling the Middle Park basin. Terrain transitions from open sage-covered valley floors and river bottoms to foothills rising sharply through timbered drainages to steep alpine basins and rocky summits above treeline. The Gore Range reaches over 13,500 feet (Mount Powell 13,586 ft, Eagles Nest 13,419 ft). About 80% of the terrain has slope equal to or less than 27 degrees, but significant roadless steep zones dominate the wilderness core. Lodgepole pine beetle kill has altered forest structure and game distribution across much of the mid-elevation conifer belt in Summit County.

Primary highway access is via Interstate 70 through the Eisenhower Tunnel (western approach) intersecting Colorado Highway 9 at Silverthorne. CO-9 runs north through the Blue River valley to Kremmling (US-40) — this corridor bisects the unit. CO-91 exits I-70 near Copper Mountain toward Leadville, tracing the southern boundary. US-40 serves the northern edge near Kremmling along the Colorado River. White River National Forest (Dillon Ranger District, 680 Blue River Pkwy, Silverthorne CO 80498; 970-468-5400) administers the bulk of public land — approximately 250,000 acres with an extensive network of Forest Service roads and trailheads. Key trailheads include Lower Cataract Lake Loop (Eagles Nest Wilderness #57), Lower/Upper Slate Lakes (Gore Range, Eagles Nest Wilderness #65), and McCullough Gulch (#43 south of Breckenridge near Quandary Peak). The Eagles Nest Wilderness (135,114 acres, spanning Eagle and Summit Counties) covers the western Gore Range within the unit — motorized vehicles and mechanized equipment are prohibited; access is foot or horse only. The Gore Range Trail and Buffalo Mountain, Rock Creek, Mirror Lake, and Upper Piney Lake trails access backcountry. The Blue River valley corridor from Silverthorne to Kremmling is predominantly private ranch land along the river bottom; private checkerboard significantly limits low-elevation access. Northern Grand County portions near Williams Fork Reservoir may also involve Arapaho and Roosevelt National Forest jurisdiction. Seasonal road closures on higher Forest Service roads typically run November through May/June. Four-wheel drive with chains is recommended for secondary roads in wet or snow conditions; horses are advised for remote wilderness tracts.

The unit hosts a diverse mosaic of habitat types tied to elevation: sagebrush and mountain shrub (mountain mahogany, oakbrush) dominate south-facing slopes and valley bottoms at lower elevations; aspen and cottonwood groves occupy mid-elevation benches and riparian corridors; dense lodgepole pine (heavily beetle-killed regionally) and spruce-fir cover the mid-to-upper slopes; open parks and subalpine meadows exist below timberline; alpine tundra and talus cover the highest terrain above approximately 11,500 feet. Riparian willow and cottonwood line the Blue River, Williams Fork, and Colorado River drainages. Irrigated hay meadows on private land in valley bottoms provide critical winter forage. Transition zones where aspen, shrub, and coniferous cover meet are the highest-quality big-game habitat.

Elk are well distributed throughout the unit and adjacent Middle Park complex, utilizing the steep timbered drainages of the Gore Range and Eagles Nest Wilderness in summer and migrating to lower foothills and valley-edge winter ranges as snows deepen in October–November. Bull-to-cow ratios are favorable due to steep, heavily timbered terrain providing refuge, though the unit is managed for hunter opportunity rather than trophy production. Mule deer occupy similar transitional habitats with good numbers maintained; bucks use mid-elevation aspen-shrub-conifer transition zones and move westward and to lower elevations during autumn migration. Pronghorn antelope occur in open sage-covered range and parks north of Silverthorne and in valley-floor grasslands; most accessible pronghorn range is private. A growing Shiras moose population utilizes the willowed riparian corridors of the Blue River, Williams Fork, and other drainages. Black bear are present throughout forested portions of the unit. Mountain lion inhabit the rocky terrain of the Gore Range and foothills. Turkey are also present. All large ungulates move to lower elevations and south-facing winter ranges as early-season storms push through, with most migration occurring mid-October through November.

1. The 18% hunter success rate and total harvest of 620 (from 3,806 total hunters) is an all-species/all-hunt-types composite from 2022 HuntScore data — not elk-specific. Elk-specific and deer-specific success rates for GMU 37 alone were not recoverable from open sources. 2. Tag quotas are not publicly available in readily accessible web sources for GMU 37 specifically; CPW Big Game Brochure hunt code tables are the authoritative source. 3. Elk OTC status: Unit 37 appears to retain OTC antlered bull licenses for 2nd and 3rd rifle seasons for residents; archery elk is now draw-only for non-residents west of I-25 (Unit 37 is west of I-25) — confirmed by HuntWise 2026 guide noting elimination of non-resident OTC archery. 4. Antler restriction: all antlered elk in GMU 37 must have 4+ points on one antler OR a brow tine at least 5 inches long (applies to all seasons) — verify exact restriction in 2026 CPW brochure hunt code table. 5. White-tailed deer removed — no sourced evidence of presence in this mountain unit. 6. Moose quota information was not recoverable; tags available for combined GMUs 37 and 371. 7. Private land in the Blue River valley corridor between Silverthorne and Kremmling is a significant access constraint for lower-elevation hunting. 8. Eagles Nest Wilderness spans Eagle and Summit Counties (not Grand County). 9. Lodgepole pine beetle kill statistic (90%+ of stands) is regional Summit County data, not a unit-specific CPW-sourced figure.