In the high country basins and rolling sage-covered hills of Northwest Colorado, a tradition that began centuries ago still echoes today. While compound bows and modern rifles dominate much of the conversation around big game hunting, black powder rifles, which are loaded from the muzzle, primed and fired with a telltale puff of smoke, still hold a historically relevant place among the dedicated hunters who have patience and a nostalgic approach to harvesting an elk or mule deer.
Muzzleloader season in Colorado occurs in September and is placed in the latter third of archery and before rifle season. It’s a narrow window, lasting just nine days for the 2025 season, but it aligns with one of the most magical times in the elk woods: the rut.
Bulls are bugling and herds are on the move. For those carrying a sidelock or inline muzzleloading rifle into the timber, it’s a time to appreciate the unique timing, opportunity and tradition that comes with it.
A Slower, Older Way
Hunting with a muzzleloader is more than just making a choice about a hunting weapon—it’s about mindset. Every shot must be planned and prepared for, often months in advance. Each load requires research and range time beforehand as well as time and focus in that important moment of truth.
Powder must be measured precisely and patches (when used) must all be similar. The bullet, which is seated by hand with a ramrod, must be seated firmly against the powder to ensure an accurate and safe discharge. For those who are more traditional in nature, ignition comes from a percussion cap or flintlock spark, both of which are prone to fluctuations in temperature, condensation and precipitation. The amount of “possibles” that must be carried, often in a “possibles bag,” far exceeds the doo-dads and small items used with bows or rifles.
But, for many hunters, that process is an important (and often compulsive) part of the experience as the hunt itself.
Muzzleloaders have a long and deeply-rooted history in the American West. Long before cartridges and centerfire rifles, black powder was the currency of survival and trade for pioneers and Native Americans alike. In the early 1800s, mountain men like Kit Carson and Jim Bridger roamed Colorado’s river valleys and high alpine parks with flintlock rifles and possibles bags slung over their shoulders, often moving through the exact same country where hunters still pursue game today.
To walk those same trails with a muzzleloader, particularly a traditional one, is to participate in an extension of history. In places like Moffat and Routt counties, the connection between past and present is easily established once the vehicle disappears into the backdrop and the foreground of mountains, rivers and plains rises to overtake all traces of the modern world.
The Advantage of Timing
Colorado’s muzzleloader season typically falls later in September, which is generally during the peak of the elk rut. Unlike rifle hunters who often face pressured elk in October and November, black powder hunters can benefit from elk which are more vocal and are in more natural movement patterns.
That timing, combined with relatively low hunting pressure compared to the rifle seasons, give muzzleloader hunters a unique advantage, assuming elements can come together to give hunters a chance at a shot.
However, traditional sidelock muzzleloaders have limited effective distance and are dependent on the type of projectile and load (or charge) that is pushing it. Most are accurate within 100 yards before the amount of energy that they have drops to an unacceptable level. That makes shot placement, range estimation and preseason preparation critical. The reward and feelings that come with it, however, are unmatched. A close-quarters encounter with a fired-up bull, which has been answering calls echoing through timber, and feeling the rush of closing the gap with nothing but instinct and iron sights, is something that no hunter will soon forget.
Mule deer and black bear are also target species during muzzleloader season with the proper tag. Bucks are often transitioning out of velvet and their summer bachelor groups, and bears are actively feeding during hyperphagia as they prepare for winter. The muzzleloading season also offers a rare chance to pursue different species during a single outing with the same primitive firearm.
Traditional vs. Inline: A Matter of Heritage and Performance
Traditional muzzleloaders demand a deeper level of familiarity and care, from measuring loose powder to seating round balls or conicals by hand,even in a hurry. The trade-off, however, is reduced reliability in wet conditions and shorter effective ranges. For hunters who embrace the challenge, the reward is a hunt that is laced with the fingerprints of that past, where every successful shot feels earned in the truest and deepest sense of history.
Inlines, by contrast, represent a major evolution of muzzleloading technology. They use modern primers, a more sealed ignition system and also benefit from improved rifling and tighter tolerances. Many allow for quicker loading and cleaner ignition, making them more reliable in harsh and variable weather conditions. Some inline hunters use pre-measured pellets, increasing accuracy and extending range up to 200 yards or more.
However, in Colorado, inlines are still subject to limitations as scopes and sabots are prohibited during muzzleloader season, which narrows performance gaps. Still, those seeking greater consistency without abandoning the spirit of black powder might find strength in the fact that inlines offer a functional compromise between the technology of the past and the present.
What to Know Before You Go
Colorado Parks and Wildlife maintains strict and well-published regulations for muzzleloader equipment. To preserve the integrity of the season and its associated challenges, scopes are prohibited. Only open or iron sights are permitted. Projectile types are regulated, with sabots and smokeless powder being off-limits. Each muzzleloader must be loaded from the muzzle with a single projectile, and ignition systems must meet specific criteria depending on the model. For traditional muzzleloaders pursuing big game, using a patched round ball means that the hunter must be firing it from a rifle that is .54 caliber or larger. If shooting conicals for big game, it must be .50 caliber or larger.
Hunters must also wear at least 500 square inches of fluorescent orange above the waist, including a head covering, during muzzleloader season.
Preparation matters, both during the hunt and in the preseason. Rain can ruin powder and dreaded misfires are always a possibility. Reloading under pressure is never quick, and often hunters use premeasured charges outside of a pour from the powderhorn. Those charges, which are the most effective at different ranges, are determined during many range sessions long before the season, when different size projectiles and amounts of powder are tested.
A Legacy in Smoke
In a world that features an ever-increasing pace of life, traditional muzzleloading offers the chance to hunt slowly and with purpose. It demands that hunters know the terrain, their target species and their weapon, which is not just a tool, but a historically rooted conduit towards a deeper form of pursuit.
In Northwest Colorado, where aspens turn gold in fall and bugles roll down through the timber like thunder, the tradition of looking down iron sites atop a muzzleloader remains alive. For a growing number of hunters, the reward is no longer about the harvest. It’s about the journey, which is measured not by a punched tag or the amount of miles hiked, but instead is evaluated by a deeper connection to the land, the past, the spirit of the hunt and the connection to the animal.