Idaho Rainbow Trout Fishing Regulations - Bag Limits & Size Rules
| Regulation Type | Statewide Rule | Special Waters (Some) | Notes |
|---|---|---|---|
| May 27 through Nov 30. 6 fish per day. | |||
| Jun 1 through Sep 30. 6 fish per day. |
* Always verify the specific regulations for your target water body. This table shows statewide minimums - individual lakes and rivers may be stricter. Source: 2026 Freshwater Fishing Regulations.
Special Regulations - Idaho's Most Popular Rainbow Trout Waters
These major fishing destinations have additional Rainbow Trout regulations beyond the statewide minimum. Verify the current Freshwater Fishing Regulations before every trip.
| Water Body | Region | Daily Bag | Size Limit | Special Notes |
|---|
License Required to Fish Rainbow Trout in Idaho
A valid Idaho freshwater fishing license is required to fish for Rainbow Trout. Here's exactly what you need and what exemptions apply.
| Angler Type | License Required | Fee | Valid Period |
|---|
Idaho Rainbow Trout Season Guide - Best Times to Fish
Top Idaho Lakes for Rainbow Trout - Ranked
Henry's Fork of the Snake River is a classic Idaho trout stream offering excellent rainbow trout fishing in cold, clear freestone water. Dry fly fishing hatches from April through October; nymphing is effective year-round. Check state regulations for catch-and-release sections and artificial-only stretches.
Full guideSouth Fork Snake River is a classic Idaho trout stream offering excellent rainbow trout fishing in cold, clear freestone water. Dry fly fishing hatches from April through October; nymphing is effective year-round. Check state regulations for catch-and-release sections and artificial-only stretches.
Full guideSnake River at Twin Falls is a classic Idaho trout stream offering excellent rainbow trout fishing in cold, clear freestone water. Dry fly fishing hatches from April through October; nymphing is effective year-round. Check state regulations for catch-and-release sections and artificial-only stretches.
Full guideBoise River is a classic Idaho trout stream offering excellent rainbow trout fishing in cold, clear freestone water. Dry fly fishing hatches from April through October; nymphing is effective year-round. Check state regulations for catch-and-release sections and artificial-only stretches.
Full guideAmerican Falls Reservoir reservoir provides outstanding rainbow trout fishing, especially in spring and fall when fish feed actively near the surface. Trolling spinners and spoons along the thermocline produces fish in summer. Shore fishing with powerbait is productive for planted fish.
Full guide