Idaho Fly Fishing Hatch Chart
Interactive fly fishing hatch chart for Idaho. See which mayflies, caddisflies, stoneflies, and midges are hatching each month and get fly pattern recommendations. Based on 10 years of scientific observation data (2015–2024).
Using the Idaho hatch chart
This statewide chart compares when aquatic insect observations have been recorded in Idaho. Select a month to compare the share of annual mayfly, caddisfly, stonefly, and midge observations, then review fly patterns commonly used to imitate those insect groups.
Our Idaho hatch chart is built from 10 years of scientific observation data (2015–2024), covering the major aquatic insect orders: Ephemeroptera (mayflies), Trichoptera (caddisflies), Plecoptera (stoneflies), and Diptera (midges). Use it to plan your fishing trips around the most productive emergence windows of the season. Actual timing varies with elevation, latitude, water temperature, and seasonal weather, so confirm current activity with local reports and on-water observation.
Idaho river guides
- Henrys Fork — Henrys Fork is a famous Idaho trout river with spring-fed and tailwater influences. The river's multiple gauges make reach-specific flow checks much more useful than a single basin-wide estimate.
- Silver Creek — Idaho's Silver Creek is a spring creek destination where clear water, aquatic vegetation, and exact presentation make current conditions and hatch timing especially valuable.
- Rock Creek — Idaho's Rock Creek has extensive mapped trout-water coverage and a gauge at Twin Falls that helps anglers put recent precipitation and runoff in context.