Bass Fishing Season in Colorado: Regulations, Limits, and the Best Times to Fish

Colorado may be world-famous for its trout fisheries, but its bass fishing is a well-kept secret that rewards anglers who know where — and when — to look. Colorado is known for outstanding trout fishing, with other species often overlooked. If you’re into largemouth bass and don’t want to follow the trout crowd, that’s a good thing — there are still some fantastic bass fishing waters across the state if you know where to look.

Whether you’re targeting largemouth in a warm reservoir or chasing hard-fighting smallmouth down a rocky river stretch, understanding the bass fishing season in Colorado is essential before you hit the water. This guide covers everything you need: species, regulations, spawn timing, bag limits, top locations, and license requirements.

Pro Tip: Always verify regulations for the specific water body you plan to fish. Many rivers and lakes have unique rules that override statewide defaults. If you remember nothing else, remember this: always check the regulations for the specific water you are fishing.

Bass Species Found in Colorado

Colorado recognizes smallmouth, largemouth, spotted, striped, and white bass as legal game fish species in the state. Each species occupies a different type of habitat, which means your approach and target location will vary depending on which one you’re after.

Largemouth bass are the most widely pursued bass species in Colorado. They’re found in several lakes and a few rivers throughout the state, with the best fisheries generally located east of the Rockies, including the Front Range and areas relatively close to Denver, Colorado Springs, and Fort Collins.

Smallmouth bass thrive in Colorado’s clearer, cooler reservoirs and rocky river systems. Pueblo Reservoir is known for giant smallmouth bass, but also contains big largemouth and spotted bass. The 15-inch limit allows it to support a very healthy bass population in the 2–6 pound range.

Spotted bass are less common but present in select waters, particularly in the southern and western parts of the state. While bass are not the most popular freshwater gamefish in Colorado, the state still ranks as one of the top states when it comes to spotted, largemouth, and smallmouth bass fishing opportunities.

Striped bass and white bass round out the species list. White bass and their hybrid offspring — wipers (striped bass × white bass) — are popular targets in several Front Range reservoirs. If you are fishing for wiper or white bass in certain drainage areas, the daily bag and possession limits are different depending on the specific area. Always check the regional map in the CPW brochure before keeping white bass or wipers.

Key Insight: A trophy-sized bass in Colorado isn’t the same as a trophy bass from California or Texas. Anything over 18 inches is a pretty nice bass by Colorado standards.

Bass Fishing Season Dates and Regulations in Colorado

Unlike many states, Colorado does not close most waters for an entire season. The majority of rivers, streams, lakes, and reservoirs are open year-round. This means bass fishing is technically available in Colorado throughout all four seasons — a major advantage for anglers who want consistent access to the water.

Annual fishing licenses are valid for 13 months — from March 1 through March 31 of the following year. The current season runs March 1, 2025, to March 31, 2026. This structure means you’re covered for the full calendar year, including prime spring and summer bass months, with a single license purchase.

However, specific water bodies often carry special regulations — including restricted gear types, reduced bag limits, size minimums, or catch-and-release-only rules. These water-specific rules can significantly change how and when you can legally fish for bass, so reviewing the CPW Fishing Brochure before each outing is a must.

You can find the full current regulations at eRegulations Colorado Fishing or directly through CPW’s official website. For a broader look at how Colorado’s fishing license structure works, visit Colorado fishing license requirements.

Important Note: While many areas follow statewide fishing regulations, others have specific rules aimed at protecting local fish populations. Never assume statewide defaults apply to the water you’re fishing.

Catch-and-Release Rules and Closed Seasons in Colorado

Colorado doesn’t impose a universal closed season on bass, but several individual water bodies enforce strict catch-and-release rules or temporary closures that directly affect bass anglers.

At some designated waters, bass must be returned immediately after being caught. At certain specific locations, largemouth and smallmouth bass must be returned to the water immediately. These restrictions typically apply to high-quality fisheries where CPW is actively managing for trophy-sized populations.

For example, fishing at Snapper Pond in Larimer County requires anglers to adhere to a minimum size limit of 15 inches for largemouth and smallmouth bass. Waters like this often combine size restrictions with mandatory release of undersized fish.

On catch-and-release waters, how you handle fish matters just as much as whether you release them. On catch-and-release waters, you’re still expected to handle fish carefully and minimize harm. That means landing fish quickly to avoid exhaustion, keeping fish in the water as much as possible, and wetting your hands before handling while avoiding squeezing or touching gills.

Some water bodies also have seasonal closures tied to spawning or management activities. At Smith Reservoir in Costilla County, for example, there are seasonal restrictions prohibiting fishing from November 1 through the end of the waterfowl season. Always check the special regulations section of the CPW brochure for the specific body of water you plan to visit.

For reference on how other states manage seasonal closures, see how Utah handles trout fishing seasons or review the approach taken in Virginia’s trout fishing season.

Size Limits and Daily Bag Limits for Bass in Colorado

Colorado’s statewide regulations set clear size and bag limits for bass, though individual waters can impose stricter rules. Here’s what you need to know before keeping any fish.

*While there is no universal statewide bag or size limit for largemouth and smallmouth bass, there are no daily bag or possession limits for game species not specifically listed — but local special regulations frequently apply.

At many of Colorado’s most productive bass fisheries, the minimum size for largemouth and smallmouth bass is 15 inches long. At certain waters, the bag, possession, and minimum size for largemouth and smallmouth bass is 1 in aggregate, 15 inches long. That’s a significant restriction — it means you can only keep a single bass per day at those locations.

When measuring your catch, measure fish from the tip of the snout to the tip of the tail (total length) with the mouth closed, laying the fish flat against a measuring board or tape. In Colorado, fish must meet the minimum size at the time of measurement, not after being put on ice.

Common Mistake: Possession limits include fish at home, in coolers, or stored elsewhere. Keeping more than allowed, even across multiple days, is a common violation. Track your total possession carefully, not just what you catch in a single outing.

For gear selection that matches Colorado’s bass regulations and conditions, explore different types of fishing rods and different types of fishing rigs to find the right setup.

When Bass Spawn in Colorado and How It Affects Fishing

Understanding the bass spawn is one of the most powerful tools you have as an angler in Colorado. The spawn dramatically changes bass behavior, location, and feeding patterns — and knowing how to read it puts more fish in your net.

In Colorado, bass spawning typically begins when water temperatures climb into the mid-50s to low 60s Fahrenheit. Because the state spans a wide range of elevations and latitudes, spawn timing varies considerably by location. Lower elevation reservoirs on the Eastern Plains and Front Range typically see spawn activity beginning in late April through May, while higher elevation waters may not see spawning until June.

The spawn unfolds in three distinct phases that each offer different fishing opportunities:

1. Pre-spawn (March–May): Bass move from deep water toward shallow flats and begin feeding aggressively to build energy reserves. In early spring, dragging jigs and swim baits on the bottom forces a slow retrieve that gives sluggish, early-season bass the opportunity to take the bait. This is one of the most productive periods to target big fish.
2. Spawn (May–June): Bass move onto beds in shallow water — typically 1–6 feet deep — near rocky or sandy substrate with some cover. Fish are highly visible but can be pressured and selective. Sight-fishing with soft plastics is a popular approach.
3. Post-spawn (June–July): Bass recover and begin feeding heavily again. As water temperatures rise and fish become more active in late spring and early summer, incorporating a jigging motion helps entice more aggressive strikes. Green, pumpkin, or brown-colored jigs work well once crayfish become a more prevalent food source.

Pro Tip: Use a crankbait or jerk bait from late April through June when bass are most aggressive. Switch to a more finesse-style approach throughout the hotter months. Early mornings offer great topwater action in the shallower end of many reservoirs.

CPW does not impose a general closed season during the bass spawn in Colorado, but some individual waters may have special restrictions during this period. Always check the specific water body regulations before fishing during spawning months.

Best Times of Year to Fish for Bass in Colorado

Colorado’s climate and elevation create a dynamic fishing calendar. Here’s a season-by-season breakdown of what to expect when targeting bass:

Spring and fall are widely considered the peak seasons for bass fishing in Colorado. Pueblo Reservoir, for example, is known for its large population of both largemouth and smallmouth bass, with the best time to fish during the spring and fall when the bass are most active.

During summer, timing your trips around low-light windows is critical. Bass are most active during dawn and dusk — these are the best times to fish for bass. Midday summer heat pushes fish deep, so work structure at 15–25 feet or focus on shaded areas near docks and overhanging vegetation.

In fall, bass gorge on baitfish in preparation for winter. Reaction baits like spinnerbaits and lipless crankbaits work exceptionally well during this window. Weeds almost demand topwater action — toss a frog or other topwater lure and make some noise. The bass will destroy it, especially at first and last light.

For anglers interested in combining bass fishing with other species, Colorado’s warm-water fisheries also support walleye, catfish, and crappie. You can also explore different types of fishing to diversify your approach on the water.

Best Bass Fishing Lakes and Rivers in Colorado

Colorado’s best bass waters are spread across the state, from the Eastern Plains to the Western Slope. Here are the top destinations worth putting on your map:

Pueblo Reservoir (Lake Pueblo)

Pueblo Reservoir, also known as Lake Pueblo, has all the right ingredients to support an excellent largemouth bass population, and largemouth bass are easily caught from the shore here. The reservoir is known for giant smallmouth bass but also contains big largemouth and spotted bass. The 15-inch limit allows it to support a very healthy bass population in the 2–6 pound range, and 100-fish days are not uncommon.

Chatfield Reservoir (Littleton)

Chatfield Reservoir in Littleton, Colorado provides the best all-around experience for finesse bass fishing. For the experienced bass angler looking for the biggest bass the state has to offer, it’s possible to specifically target larger fish with a trophy-focused mentality. Located near Denver, Chatfield is one of the most accessible quality bass fisheries on the Front Range.

Horsetooth Reservoir (Fort Collins)

Horsetooth Reservoir contains an ample population of smallmouth and largemouth bass eager to smack your lure. The reservoir’s rocky structure and clear water make it a prime smallmouth destination, particularly in spring and fall.

McPhee Reservoir (Dolores)

McPhee Reservoir continues to produce healthy numbers of giant smallmouth bass. Its steep rocky shorelines and offshore structure offer prime habitat for growing trophy smallmouth bass. McPhee is regarded as one of the best bass fisheries in Colorado, hosting many bass tournaments each year.

St. Vrain State Park (Longmont/Fort Collins Area)

St. Vrain State Park has a couple of smaller lakes filled with largemouths waiting to put a bend in your rod, and it’s right outside Fort Collins. The park’s accessible ponds make it a great option for anglers without a boat.

Aurora Reservoir

This Aurora-based reservoir is a favorite among local bass anglers. It’s a smaller body of water, which can make for a more intimate fishing experience. The reservoir is stocked with largemouth bass and offers excellent fishing opportunities throughout the year.

John Martin Reservoir and Navajo Reservoir

The usual bassy candidates include John Martin Reservoir and Navajo Reservoir, both of which are known for consistent largemouth bass action. John Martin, located on the Eastern Plains near Lamar, warms up quickly in spring and delivers some of the earliest bass action in the state.

Key Insight: The Denver metro area has several great bass fisheries, with bass averages in the 3–4 pound range. Pueblo and Colorado Springs can make the same claims. You don’t need to drive hours into the backcountry to find quality bass water.

For anglers planning multi-species trips, Colorado’s warm-water reservoirs often hold walleye, catfish, and wiper alongside bass. Colorado provides 27,000 miles of streams and more than 1,300 lakes and reservoirs, with the possibility of catching 35 species of warm-water and cold-water fish.

If you’re targeting bass on rivers, the Lower Gunnison River and sections of the Colorado River on the Western Slope offer excellent smallmouth habitat. From the confluence with Hermosa Creek downstream to the state line, there is no bag or possession limit for largemouth bass, smallmouth bass, northern pike, walleye, green sunfish, bluegill, bullhead, yellow perch, or crappie — making it a great stretch for anglers who want to keep fish.

For more fishing inspiration across neighboring states, check out the trout fishing season in Wyoming or explore the trout fishing season in Texas for comparison.

Bass Fishing License Requirements in Colorado

You need a valid Colorado fishing license to target bass in the state. Here’s a complete breakdown of what’s required, what it costs, and how to get yours.

Who Needs a License

Anyone age 16 or older must carry a valid Colorado fishing license while fishing. Any angler under the age of 16 fishes for free without any license. They still must follow all bag and possession limits and carry a second-rod stamp if using a second line.

License Costs (2025–2026 Season)

Resident adults pay $44.87 for an annual license, while non-residents pay $124.01. Each additional-day license at $9.13 extends your fishing one more calendar day — you can stack these for multi-day trips without committing to a full annual license.

Habitat Stamp Requirement

Colorado also requires anglers to purchase a Habitat Stamp for $12.15 once per season with any hunting or fishing license. This money goes toward a program that helps protect fish and wildlife habitats across the state. Note that anglers purchasing only one or two one-day licenses may be exempt from the Habitat Stamp fee.

Where to Buy Your License

You can buy your license online at cpwshop.com, by phone at 1-800-244-5613, or in person at hundreds of retail locations across the state. Retail options include authorized retailers such as fly shops, sporting goods stores, Walmart, and Cabela’s.

Free Fishing Weekend

Colorado hosts an annual Free Fishing Weekend — one of the most popular fishing events in the state. The 2026 Free Fishing Weekend falls on Saturday, June 6 through Sunday, June 7, 2026. This is a great opportunity to introduce new anglers to bass fishing without the cost of a license.

Second Rod Stamp

Any person may use one additional (second) personally attended line statewide when a second rod stamp is purchased, signed by, and attached to the user’s fishing license. This is worth adding if you plan to fish two rods simultaneously from a boat.

Important Note: A Social Security Number or Individual Taxpayer Identification Number (ITIN) is required by federal law for all new license purchasers aged 16 and older. Without it, you cannot legally buy a Colorado fishing license.

For a complete breakdown of Colorado’s fishing license structure, visit the Colorado fishing license requirements guide. You can also compare requirements in neighboring states like Washington or Vermont if you’re planning a multi-state fishing trip.

If you’re new to bass fishing or want to sharpen your gear setup, explore types of fishing reels, different types of fishing lines, and different types of fishing rods to build the right Colorado bass rig. You can also check out goose hunting season in Colorado if you want to pair your fishing trip with waterfowl action.

Colorado’s bass fishing season is open, accessible, and packed with opportunity year-round. Get your license, study the regulations for your target water, and head out when the conditions align — the bass are waiting.