2026 regulation year
Zimmerman Lake (Larimer County) 2026 — Colorado Fishing Regulations
Colorado statewide rules apply unless overridden below.
Last updated
Zimmerman Lake (Larimer County) carries a special-regulation overlay on top of Colorado's 2026 fishing rules. Verify the agency booklet before launching: in-season changes are not yet wired to this page.
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State-level special regulation
CPW greenback-cutthroat conservation water — artificial flies and lures only; all trout released immediately upon catch (0 / day); inlet closed Jan 1 – Jul 31 as posted (vs the 4 / day, bait-allowed statewide default) (Chapter W-1 #483)
Source: Colorado special-water list
Official source
Colorado Parks and Wildlife (CPW) publishes the authoritative 2026 Colorado fishing regulations. Special-regulation lakes and rivers are listed in the agency booklet — always verify before fishing.
Visit official Colorado fishing regulations →
Emergency-order channel
In-season closures, slot-limit changes, and run-count-driven harvest pauses are posted to Colorado Parks and Wildlife's emergency-order feed — check it before any Colorado trip during the active season.
Other special-regulation waters in Colorado
- Animas River through Durango
- Antero Reservoir (Park County)
- Arkansas River Leadville to Cañon City
- Bear Creek headwaters
- Big Thompson River + Eagle River + Blue River + Colorado River
- Black Canyon of the Gunnison National Park
- Blue Mesa Reservoir
- Chatfield Reservoir
- Cherry Creek Reservoir
- Conejos River + Animas River + Yampa River + Big Thompson River + Eagle River + Blue River + Colorado River + Gunnison River Gold Medal reaches
- Crawford Reservoir (Delta County)
- Crosho Reservoir (Rio Blanco County)
Frequently asked questions
- What special fishing regulations apply at Zimmerman Lake (Larimer County)?
- Zimmerman Lake (Larimer County) carries one special-regulation overlay that overrides Colorado's statewide 2026 rules. It reads: "CPW greenback-cutthroat conservation water — artificial flies and lures only; all trout released immediately upon catch (0 / day); inlet closed Jan 1 – Jul 31 as posted (vs the 4 / day, bait-allowed statewide default) (Chapter W-1 #483)." Every overlay on this water body is listed in full above.
- Do I need a fishing license to fish Zimmerman Lake (Larimer County)?
- Yes. Zimmerman Lake (Larimer County) is in Colorado, so a valid Colorado fishing license is required just as it is anywhere else in the state, issued by Colorado Parks and Wildlife (CPW). The special regulations on this page change the bag, size, slot, or gear rules for Zimmerman Lake; they do not waive the license requirement. Free-fishing days and youth exemptions follow the statewide Colorado rules.
- Do Zimmerman Lake (Larimer County)'s special rules replace Colorado's statewide limits?
- Only where they conflict. Colorado's statewide 2026 regulations apply on Zimmerman Lake by default; the overlays above replace the matching statewide rule for the species or gear they name, while everything not specifically overridden still follows the statewide rule. When a water-body rule and the statewide rule disagree, the water-body rule wins.