Colorado muzzleloader regulations set a mid-September, nine-day season for deer and elk with much tighter equipment rules than rifle season: open or iron sights only, loose granular black powder or a granular substitute, no sabots or pelletized powder, species-specific caliber and bullet-weight minimums, and a limited-license tag drawn in the spring. Colorado Parks and Wildlife enforces the rules under 2 CCR 406-2, and small details around sights, powder, and projectiles are what catch hunters out.
When Muzzleloader Season Runs
The muzzleloader seasons for deer and elk ran September 13 through 21 in 2025, and the 2025–2029 Big Game Season Structure keeps the same mid-September window in place through the planning period.1Colorado Parks and Wildlife. 2025-2029 Big Game Season Structure Exact dates shift slightly year to year, so confirm against the current brochure before booking anything.
Legal Firearms and Sights
The firearm must load from the muzzle. Breech-loading designs are prohibited outright. Both in-line and traditional sidelock ignition systems are legal, but no electronic or battery-powered device can be built into or attached to the gun. That rules out electronic triggers, battery-powered ignition modules, and any lighted component on the firearm.2Justia Law. Colorado Code of Regulations 2 CCR 406-2-203 – Manner of Take
Sights are the sharpest break from rifle season. Any sighting device other than open or iron sights is prohibited during muzzleloader seasons.2Justia Law. Colorado Code of Regulations 2 CCR 406-2-203 – Manner of Take No scopes. No red dots. No magnifying lenses of any kind. Fiber optic front and rear sights are widely used and count as a type of open sight, but anything that magnifies, illuminates electronically, or projects a reticle is off limits. Practical effect: your effective range shrinks considerably compared with a scoped rifle.
Powder, Projectiles, and Sabots
During muzzleloader-only seasons, both smokeless powder and pelletized powder systems are prohibited.2Justia Law. Colorado Code of Regulations 2 CCR 406-2-203 – Manner of Take You must use loose granular black powder or a granular black powder substitute such as Pyrodex or Triple Seven. The pelletized powder ban is the one that trips up hunters most often. Those pre-formed pellets are convenient, but they are illegal in these seasons.
Sabots are also prohibited. For purposes of the regulation, cloth patches are not considered sabots, so a patched round ball is legal.2Justia Law. Colorado Code of Regulations 2 CCR 406-2-203 – Manner of Take The projectile itself has to engage the rifling directly.
One safety note on substitutes: black powder substitutes are measured by volume, not weight. Because substitutes like Pyrodex are less dense than true black powder, measuring by weight on a scale can produce a dangerous overcharge. Some higher-energy substitutes like Triple Seven recommend reducing the charge by about 15 percent compared with an equivalent black powder load. Follow the powder manufacturer’s data.
Caliber and Bullet Weight Minimums
Caliber requirements depend on the species and whether you’re shooting a conical bullet or a round ball:
- Deer, pronghorn, and bear with a conical bullet: minimum .40 caliber
- Deer, pronghorn, and bear with a round ball: minimum .50 caliber
- Elk and moose with a conical bullet: minimum .50 caliber
- Elk and moose with a round ball: minimum .54 caliber
On top of caliber, bullet weight has a floor. Any rifle from .40 through .50 caliber must shoot a bullet weighing at least 170 grains. Rifles over .50 caliber require at least 210 grains.2Justia Law. Colorado Code of Regulations 2 CCR 406-2-203 – Manner of Take Weight minimums exist because a light bullet in a large bore can lack the penetration for a clean kill.
Blaze Orange or Pink Requirement
Every muzzleloader hunter in Colorado must wear at least 500 square inches of solid daylight fluorescent orange or fluorescent pink as an outer garment above the waist, plus a hat or head covering in the same fluorescent color that is visible from all directions.3Colorado Parks and Wildlife. Deer – In the Field
Camouflage orange or pink does not count toward the 500-square-inch requirement.3Colorado Parks and Wildlife. Deer – In the Field The color has to be solid. Mesh garments are technically legal but not recommended by CPW. This is one of the most commonly cited violations in the field, and a blaze orange vest and cap will keep you clear.
Drawing a Tag and Qualifying License
Most muzzleloader tags for deer, elk, pronghorn, and moose go through Colorado’s limited-license draw. The primary draw application period opens March 1 and closes in early April. For 2026, the deadline is April 7 at 8 p.m. Mountain Time.4Colorado Parks and Wildlife. Big Game
You need a current-year qualifying license before you can apply. An annual small game license is the most common choice, though several other license types qualify.5Colorado Parks and Wildlife. Qualifying License The qualifying license and the draw application can go in the same shopping cart, but the qualifying license must be added first.6Colorado Parks and Wildlife. Primary Draw
Colorado uses a preference point system for deer, elk, pronghorn, and bear. If you don’t draw your first-choice license, you earn one point for that species, and applicants with the most points draw first in the next cycle. If you want to build points without hunting, you can apply using the “preference point only” hunt code as your first choice.4Colorado Parks and Wildlife. Big Game Preference points are only available through the primary draw. Popular muzzleloader units can take several years of point-building before a tag comes through.
Hunter Education
Anyone born on or after January 1, 1949, must complete an approved hunter education course before applying for a draw or buying a hunting license. Have your certification and card number ready before submitting your application, and allow up to 24 hours after course completion for your record to sync into CPW’s system.7Colorado Parks and Wildlife. Education and Outreach Carry proof of hunter education in the field while hunting.8Colorado Parks and Wildlife. New to Hunting
License Fees
Colorado doesn’t sell a separate “muzzleloader tag.” You apply for a species-specific big game license for a particular game management unit and season, and a muzzleloader deer license costs the same as any other limited deer license. A resident adult deer license runs $49.15, resident adult elk is $67.86, and resident youth licenses for deer, elk, or pronghorn are $18.90. Nonresident adult deer runs $494.47 as a combo with fishing, and nonresident adult elk runs $825.03 as a combo. Each draw application also carries a nonrefundable processing fee of $8 per species for residents and $11 for nonresidents, and a resident annual small game license (the usual qualifying license) is $36.08.
After the Shot: Tagging and Evidence of Sex
Once you kill an animal, void your license immediately. The carcass tag then has to be attached to the animal, usually by cutting a hole in the hide and securing the tag with a tie. CPW allows waiting until you reach your vehicle or camp to physically attach the tag, but voiding the license itself can’t wait.9Colorado Parks and Wildlife. Final Regulations – Chapter W-0 – General Provisions The tag stays with the carcass until the meat reaches its final destination.
Failing to void your license or carcass tag is a misdemeanor under Colorado Revised Statutes 33-6-111, carrying a $100 fine and 10 license suspension points. Enough suspension points can cost you your hunting privileges for years.
Evidence of sex must stay naturally attached to the carcass or a portion of it during transport. For deer, elk, pronghorn, and moose, that means:
- Males: head (including antlers or horns), testicle, scrotum, or penis
- Females: head, udder, or vulva
The evidence has to remain attached until the animal is processed at your residence or a commercial processor.10Justia Law. Colorado Code of Regulations 2 CCR 406-0-003 – Evidence of Sex/Species/Antler Point Compliance Quartering an animal in the field without leaving sex evidence attached to at least one portion is a quick way to get cited.
Taking Meat Across State Lines
Nonresidents heading home face Chronic Wasting Disease transport rules. States with CWD regulations generally prohibit importing brain or spinal column tissue from cervids. Most allow only deboned meat, quarters with no spine or head attached, commercially or privately processed meat, clean skull plates with antlers, and finished taxidermy. Hides must not have heads attached.
Check three sets of rules before you drive: the state you hunted in, your home state, and every state you’ll travel through. Colorado has CWD-positive units across the state, so this applies to many hunts rather than a few fringe areas.