Skip to main content

Green Sunfish

Green Sunfish

Green Sunfish are an invasive species in Colorado waters, introduced from their native range in eastern North America.

These aggressive panfish are highly predaceous and hardy fish that tolerate poor water conditions including high turbidity and low dissolved oxygen.

Scientific Name: Lepomis cyanellus

Physical Characteristics:
  • Typically measure 3-7 inches but can reach up to 12 inches in optimal conditions.
  • Adults have large mouths and can consume prey nearly half their body size.

What to know

Habitat Distribution

  • Introduced from their native range in eastern North America.
  • Records dating from 1969 to 2022 in Colorado.
  • Present in South Boulder Creek where they comprise part of the non-native fish community alongside brown trout and other introduced species.

Key Locations

  • Documented in 12 different watersheds including the Big Thompson, Cache La Poudre, St.
  • Vrain, Colorado Headwaters, Lower Green-Diamond, Lower Gunnison, Lower Yampa, McElmo, Piedra, Uncompahgre, and Upper Arkansas drainages.
  • Present in South Boulder Creek.

Specific Spots

  • Target areas with cover such as submerged logs, rocky shorelines, vegetation, undercut banks, and around docks or piers in lakes and ponds.
  • Often around cover such as rocks, logs, submerged vegetation, and brushy banks.
  • Fish prefer shade and cover.

Green Sunfish FAQ

Answers from onWater's species guide.

What are the best lures and bait for Green Sunfish in Colorado?

Small offerings like nightcrawlers, red worms, crickets, small minnows, pieces of bread and corn kernels. Small jigs (1/64 to 1/16 oz) particularly when dressed with soft plastic or feathered trailers. Small spoons, spinners, and crankbaits under 1 inch in length. In winter, small jigs tipped with worms.

What flies work for Green Sunfish in Colorado?

Patterns on hooks sized #10-18, including woolly buggers, nymphs, small streamers, dry flies like Adams and elk hair caddis, and rubber-legged poppers.

When is the best time to fish for Green Sunfish in Colorado?

Spring and summer months when water temperatures warm above 65-75°F. Avoid spawning periods (May-August). In winter, they can still be caught though they're less active in cold water.

How do you catch Green Sunfish in Colorado?

Bait fishing with light tackle. Fish shallow areas (less than 10 feet deep) during cooler parts of the day. Target areas with cover. In streams, focus on slower pools and backwater areas rather than fast-moving riffles.

What do Green Sunfish eat?

Feed on aquatic insects, crayfish, small fish, fish e.g.gs, and occasionally plant material. Adults are particularly aggressive toward other fish species.

Fish smarter with real-time insights

Whether you're en route and conditions shift or you're looking for the best spot based on current flows, we enable you to make informed decisions on the fly.

See it in the app

Most maps show you water.
onWater shows you Green Sunfish.

  1. 01 · Species map filter

    Map every Green Sunfish water

    Pick Green Sunfish and the map zeroes in on the waters they call home. No more guessing which lake holds them.

  2. 02 · Waterbody species

    Tap any water. See what lives there.

    Species, behavior and seasonal patterns for every lake, river and pond, before you leave the driveway.

  3. 03 · Angler Intelligence

    Ask how to catch Green Sunfish

    Tactics, gear and timing from onWater's AI fishing guide, tuned to the species and the water you're on.

Stop guessing where Green Sunfish are.

Open the map, filter by Green Sunfish, and head to water that holds them. Download onWater and plan your next trip in minutes.

  • Species map filter
  • Angler Intelligence
  • Fishing journal
Try onWater+ for free

Explore other species

Trout, bass, salmon, panfish and everything in between. Each guide unpacks the behavior, seasons, and tactics that put fish in the net.

No species information available.

Colorado licenses and regulations

Explore nearby waters

Smarter Fishing Starts in the App.

onWater Fish gives you everything you need to plan smarter, fish better, and own every trip from first cast to last.