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Hatch Charts

For the fly angler, "matching the hatch" is the ultimate game of observation and imitation. Success on the water often comes down to knowing which insects are emerging and when. A reliable hatch chart is the single most valuable tool for decoding a river's secrets, transforming a day of blind casting into a precise and productive angling experience.

This page is your definitive library of fly fishing hatch charts for the most celebrated rivers across the country. We've compiled and designed these guides to be clear, practical, and easy to use, whether you're planning a trip from afar or standing streamside.

Our Hatch Charts Provide:

  • A year-round calendar of major aquatic insect hatches (Mayflies, Caddisflies, Stoneflies, Midges).
  • The most effective fly patterns to imitate each stage of the hatch.
  • Peak timing and seasonal notes for each specific river.

Pro-Tip: Download and print these charts to keep in your fishing pack for quick reference on the water!

Explore our river-specific hatch charts below to unlock the code of your favorite destinations and arrive at the river prepared.

An illustrated infographic for fly fishing the West Branch of the Farmington River in Connecticut. On the left, a fly fisherman in waders casts into a scenic river as a trout leaps out of the water. The right side features a detailed circular "Hatch Calendar & Fly Selection" chart. The chart identifies key hatches by month, including Winter Midges (January), Hendricksons (April), Sulphurs (May–July), Tricos (July–September), Isonychia (September), and October Caddis (October). Below the calendar, small icons detail hydrological factors, dry fly opportunities, and tactical approaches for each season.

Farmington River Hatch Chart

The Farmington River hatch chart below is your definitive reference for matching insects on Connecticut’s premier tailwater a river that produces dry fly opportunities every single month of the year. From tiny winter midges in January to Trico spinner falls in August
28. March 2026.
Delaware River Hatch Chart

Delaware River Fly Fishing Hatch Chart

If you are looking to test your mettle against some of the most selective trout in the country, the Upper Delaware River system is your ultimate proving ground. Encompassing the West Branch, East Branch, and the Main Stem, the Delaware is often
13. May 2026.
Henrys Fork Hatch Chart

Henry’s Fork Hatch Chart

If you want to test your mettle as a fly angler, you pack your gear and head to the Henry’s Fork of the Snake River in Idaho. This isn’t just another trout stream; it is a graduate-level course in aquatic entomology and
11. May 2026.
yakima river hatch chart

Yakima River Hatch Chart: A Fly Fishing Expert’s Guide

If you are gearing up to fish Washington State’s only designated blue-ribbon catch-and-release wild trout fishery, you need to understand that the Yakima River is not your typical freestone stream. Tracing 214 miles through the Columbia Plateau, the “Yak” is a highly
10. May 2026.
Stop guessing on the water. Get the updated Davidson River hatch chart featuring month-by-month emergence data, exact fly sizes, and streamflow secrets.

Davidson River Fly Fishing Hatch Chart

Nestled in the lush Pisgah National Forest of Western North Carolina, the Davidson River is legendary among anglers. Renowned as a top-tier trout stream, it boasts a dense population of wild and holdover brown trout, rainbow trout, and native brook trout. However,
1. May 2026.
A composite image featuring a framed vintage-style "Penns Creek Hatch Chart" in the center, which lists various trout flies and insect patterns categorized by Spring, Summer, and Fall. The chart is flanked by two outdoor scenes: on the left, a fly fisherman casts into a snowy river labeled "JAN: Little Black Stoneflies"; on the right, a fisherman stands in a river surrounded by vibrant autumn foliage labeled "OCT: October Caddis."

Penns Creek Hatch Chart

From Little Black Stoneflies in January to October Caddis in fall every hatch, every pattern, and every access point on Pennsylvania’s premier limestone trout stream. Few trout streams in the Eastern United States pack as much entomological drama into a single season
23. April 2026.
A comprehensive monthly hatch chart for the Bighorn River, displaying a calendar of insect and organism activity from January through December. The chart lists 13 categories including Scuds, Sowbugs, Blue-Winged Olives, and Terrestrials. Small blue dots indicate general availability, while dark blue "PEAK" labels highlight the most active months for specific hatches. For example, Blue-Winged Olives peak in April, May, and October, while Terrestrials peak in August and September. A central inset photo shows a fly fisherman wading in a scenic river canyon.

Bighorn River Hatch Chart

The Bighorn River below Yellowtail Afterbay Dam near Fort Smith, Montana, is one of the premier tailwater fly fisheries in the United States. Its dam-regulated temperatures (rarely above 65°F in summer and rarely below 35°F in winter) create a near-perfect year-round environment
28. March 2026.
Fly fisherman wading the Big Hole River at golden hour, casting a wide arc of fly line over clear rocky water with snow-capped Montana mountains and pine forest in the background.

Big Hole River Hatch Chart

The Big Hole River is one of the most entomologically complex waterways in the American West. Its hatch calendar is dense, sequential, and governed by hydrology — understand the chart, and you understand the river. Why the Big Hole River hatch chart
22. March 2026.
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