The white-tailed deer is a common but geographically narrow presence in Colorado. Open occurrence databases hold 2,098 Colorado records for it, most of them iNaturalist photos, and they trace the state’s rivers rather than its mountains.
A deer of the river bottoms
Where the mule deer spreads across nearly all of Colorado, the white-tailed deer keeps to the eastern plains and the wooded corridors of their streams. Records concentrate along the South Platte and its tributaries through Larimer, Adams, Boulder, and Arapahoe counties, with the cottonwood galleries of the Rocky Mountain Arsenal National Wildlife Refuge a particular stronghold. The deer has followed these streamside ribbons and farm shelterbelts steadily westward, pushing toward the foothills wherever brushy, well-watered cover allows.
Autumn, the rut, and visibility
Records climb into late autumn and early winter, driven less by numbers than by behavior. As bucks chase does through the November rut and bare cottonwoods open up the view, the deer become far easier to see and photograph. Watch for the broad tail, snowy white beneath, that a startled white-tail throws up like a flag as it bounds away, and for a smooth bounding run rather than the stiff-legged pogo hop of a mule deer.
Common questions
How do I tell it from a mule deer? The white-tail has smaller ears, a single main antler beam with rising tines, and that flashing white tail; the mule deer has huge ears, forked antlers, and a thin black-tipped tail.
Where are they in Colorado? The eastern-plains river corridors, especially the South Platte drainage northeast of Denver.
Full species profile
