District 421, Montana

The district spans approximately 810 square miles of intermittent hills known as the Birdtail Hills, transitioning from the Missouri River bluffs and Interstate 15 corridor on the east to the Continental Divide foothills near Rogers Pass on the northwest. Elevation ranges from roughly 3,400 feet in the lower valley bottoms to approximately 6,100 feet on the higher ridgelines near the Divide. The landscape is characterized by rolling to moderately steep ridgelines, rocky bluffs, and broad prairie swales; steep public-land terrain averages 24 degrees or less on roughly 80 percent of its area.

Access is severely limited; approximately 90 percent of the district is private ranch land with very few public-access roads. Public land totals roughly 7-11 percent of the district, composed of scattered Bureau of Land Management and Montana state parcels with minimal connectivity. The district is bounded on the east and southeast by Interstate 15 (Cascade to Vaughn corridor), on the north by US Highway 200 / Montana Highway 200 between Vaughn and Rogers Pass. The Dearborn River and its South Fork flow through the western interior, but road access to those drainages is almost entirely across private land. Outfitter services or landowner permission are the primary means of accessing most of the district. Montana FWP Region 4 Block Management Program (Great Falls, 406-454-5862) may offer limited permitted access on enrolled private properties; hunters should verify current BMA enrollment annually. No designated wilderness areas fall within this district; the Sun River Game Preserve lies to the northwest in adjacent HD 424-425.

Northwest-facing ridge slopes support intermittent ponderosa pine stands interspersed with grassy meadows; south-facing slopes transition to shortgrass prairie, blue grama, wild rose, and yucca. Lowland drainages (Lyons Creek, Wolf Creek, the Dearborn River corridor, and South Dearborn tributaries) hold cottonwood and willow riparian strips. Higher terrain near Rogers Pass transitions toward mixed conifer. The district contains roughly 273 square miles of mapped elk habitat within its approximately 542-square-mile Elk Management Unit footprint.

Elk are the headline species; the 2025 FWP spring survey placed the HD 421 population approximately 74 percent above management objective, with early and late shoulder seasons instituted to address elevated numbers, particularly on private land. Early-season elk distributions are heavily tied to private agricultural land; cold and snow are needed to push animals into more accessible or huntable terrain. Mule deer occupy the ridges and breaks; the 2024 post-season survey indicated populations near Great Falls (including this district) are still recovering, though fawn recruitment was above average. White-tailed deer are present in river and creek-bottom riparian corridors and remain at good numbers across the region. Pronghorn occupy the eastern prairie and rolling hills but are managed under the separate antelope HD 440 (Birdtail Hills) boundary. Rocky Mountain bighorn sheep are present in the Deep Creek drainage under sheep hunting district 421 with extremely limited draw opportunity. Black bear are present at low to moderate density. Mountain lion are present. Gray wolf may range through the area as part of the broader Montana wolf population.

1. Public land pct: HuntScore=7% (BLM 2%, state 5%); GoHunt=11%; 7% used as primary. 2. Hunter success 29.4% is overall multi-species HuntScore 2021 figure (741 hunters, 571 animals) — applied to Elk as rough proxy; species-specific rates not separately sourced. 3. Bighorn sheep 100% success is a regional qualitative claim from montanaoutdoor.com covering HDs 421-424 collectively. 4. Sheep archery start corrected from Sep 07 to Sep 05 (statewide standard). 5. Mountain lion winter season end corrected from Apr 14 to approximately May 25 — Apr 14 is resident hound training end; full winter season runs to ~May 25 per fwp.mt.gov/hunt/regulations/mountain-lion. 6. Wolf 2026 season dates pending FWP Commission approval as of July 2026. 7. HD 421 reflects 2022-2024 boundary change combining old HD 421 and HD 423 into present Birdtail Hills-South Dearborn district. 8. CWD detected in new Region 4 areas as of 2025; hunters should submit deer at FWP check stations.