Free Resource · Updated 2026
The complete fly hatch chart for California's legendary trout rivers. From the world-class spring creeks of Hat Creek, Fall River, and Hot Creek to the freestone McCloud, Trinity, and Feather River, and tailwaters like the Pit and Upper Sacramento — select your river below for peak hatch timing, fly pattern recommendations, and current month highlights for 2026.
California Hatch Calendar — Quick Reference
Identifying the hatch is vital, but most days require versatile patterns that trigger strikes even when the water looks quiet. For a curated list of high-percentage patterns that belong in your box year-round, see our guide to the best trout flies in California, featuring our top 5 essential picks for these waters.
California Rivers
Hat Creek · Fall River · Hot Creek
California's volcanic plateau spring creeks maintain stable, cold temperatures year-round — producing some of the most technical and consistent dry fly fishing in the West. PMD and Trico hatches are dense and reliable from June through September. Wild rainbows are large and selective; 5X–6X tippet and precise presentations are a must. Callibaetis hatch in slower sections throughout summer.
McCloud River · Trinity River · Feather River (N. Fork)
These rivers follow snowmelt and air temperatures, making spring hatch timing variable. Golden Stonefly and Salmonfly hatches peak in May–June when runoff drops and clears. Summer brings PMDs and Caddis. October Caddis on the McCloud and Trinity in fall is one of California's most distinctive hatch events. Freestone rivers reward anglers who monitor flow conditions closely.
Pit River · Upper Sacramento River · Truckee River · East Walker River
Dam-regulated releases keep temperatures stable and extend the season. Midges and BWOs fish nearly year-round on tailwaters. The Pit River's challenging wade and unique pocket water produce PMDs and Caddis through summer. The East Walker tailwater near Bridgeport is renowned for large, selective trout that respond to precise midge and BWO presentations from fall through spring.
The Why Behind the Chart
Ephemerella inermis
California's signature mayfly hatch and the bread-and-butter of summer dry fly fishing on Hat Creek and Fall River. PMDs emerge in the morning hours on spring creeks, creating dense, prolonged feeding activity from large wild rainbows. The hatch is reliable, consistent, and demands careful presentation — trout are selective and the flat, clear water leaves no room for error. Hat Creek's "wild trout section" is famous for this hatch above all others.
Recommended: #16–18 PMD Comparadun, Sparkle Dun, CDC Emerger
Hesperoperla pacifica
One of the most exciting dry fly events on California's freestone rivers. Golden Stones hatch on the McCloud, Trinity, and Feather when spring runoff drops and water temps rise — typically May through June. Adults skitter across the surface and trout hit them aggressively. Fish large, high-floating patterns near the banks and in slack water behind boulders. The Salmonfly hatch on the Trinity often precedes the Golden Stone in late May.
Recommended: #6–8 Stimulator, Kaufmann's Golden Stone, Elk Hair Stone
Tricorythodes sp.
Fall River is one of California's premier Trico fisheries — spinner falls happen at first light on the slow-moving spring creek, creating technical dry fly challenges for experienced anglers. Trout sip tiny spent spinners in gin-clear water and can be exceptionally selective. Use 6X–7X tippet, approach from downstream, and target individual rising fish. The hatch runs July through September, peaking in August. Hat Creek and the Truckee also produce good Trico action.
Recommended: #22–26 Trico Spinner, CDC Trico, Griffith's Gnat
Hydropsyche sp.
Caddisflies are the workhorse hatch across nearly all California trout rivers in summer. Evening caddis hatches on the Truckee, Trinity, and Upper Sacramento can produce explosive surface feeding from late May through August. Elk Hair Caddis in sizes 14–16 is the go-to dry; a soft-hackle or caddis pupa swung through the current is deadly during the hatch. On tailwaters like the Pit River, caddis are often the most consistent surface food source through mid-summer.
Recommended: #14–16 Elk Hair Caddis, X-Caddis, LaFontaine Sparkle Pupa
Dicosmoecus sp.
A distinctive fall event on the McCloud and Trinity rivers. October Caddis are large, orange-bodied insects that emerge in September and October, triggering aggressive feeding from trout that have grown selective by summer's end. The sheer size of the fly — and the opportunity to fish big attractor dries in fall — makes this hatch a favorite among California anglers. Fish them near structure and along banks in the late afternoon as adults return to lay eggs.
Recommended: #8 Orange Stimulator, October Caddis, Buckskin Caddis
Baetis sp.
California's most versatile hatch — present on every river type and most reliable on overcast, drizzly days. BWOs emerge in two windows: March through May and again September through November. On tailwaters like the East Walker and Pit River, they fish well nearly year-round. Fall River and Hat Creek produce excellent BWO fishing in October and November. When the weather looks cold and gray, tie on a BWO emerger — California trout know this hatch intimately.
Recommended: #18–22 Sparkle Dun, RS2 Emerger, CDC Dun
California offers some of the most diverse fly fishing in the country, with a hatch calendar that spans nearly every month of the year on the right water. The iconic spring creeks of the northern volcanic plateau — Hat Creek, Fall River, and Hot Creek — produce prolific PMD and Trico hatches from late spring through summer, offering demanding technical fishing on wild rainbow trout in flat, gin-clear water. Midges and Blue-Winged Olives keep these rivers productive nearly year-round.
The McCloud River and Trinity River see excellent Golden Stonefly hatches in May–June, followed by outstanding summer dry fly action with PMDs and Trico. The Trinity's Salmonfly hatch in late May is one of the best big-stonefly events in California, while October Caddis on the McCloud and Trinity in fall is one of the most distinctive hatches of the year. The Feather River's North Fork offers great summer caddis and PMD fishing in a spectacular canyon setting.
Tailwaters like the Pit River and Upper Sacramento extend the season at both ends. The East Walker River near Bridgeport is renowned for its large, technical trout and produces excellent midge and BWO fishing through fall and winter. Use FlyFishFinder's live gauge data to ensure flows are fishable on your target water before making the drive.
See Live California River Conditions →Common Questions
Pale Morning Duns typically peak on Hat Creek and Fall River from late June through August. These spring creeks maintain stable temperatures that keep the hatch consistent and dense. Morning hours are best — look for fish sipping PMD duns in the flat, clear sections. Use a #16–18 Comparadun or Sparkle Dun and 5X–6X tippet for the selective wild rainbows.
Summer on California rivers calls for PMDs (#16–18) in the morning, Caddis (#14–16 Elk Hair Caddis) at dusk, and Hoppers (#10) through the afternoon on freestone rivers like the Trinity and Feather. On the spring creeks, Trico spinner falls happen at first light July through September. The East Walker and Truckee fish well with Caddis and PMD combinations all summer.
Fall River's Trico hatch is one of California's best technical fishing events. Spinner falls happen at first light, typically 6–9am, from July through September. The fish are large and selective in the flat, slow-moving spring creek water. Use #22–26 imitations, 6X or 7X tippet, and a careful approach. The hatch is best from mid-July through late August.
Golden Stoneflies peak on the Trinity River in June, with the Salmonfly hatch arriving slightly earlier in late May. These are big, exciting hatches where large dry flies can draw aggressive takes from good-sized trout. Fish the banks and structure early in the morning when adults are most active on the water.
October Caddis (Dicosmoecus sp.) is a large, orange-bodied caddis that hatches in September and October on many Northern California rivers. The McCloud River and Trinity River are among the best for this hatch. Use a #8 Orange Stimulator or Buckskin Caddis — the large profile triggers aggressive takes even from trout that have become selective during summer.
Late May through September is California's prime dry fly season. Hat Creek and Fall River peak from June–August for PMDs and Trico. The Trinity and McCloud are best in June for Golden Stones, then July–August for summer dries. The East Walker and Truckee fish well July–September. Fall brings excellent BWO fishing September through November on most rivers.
FlyFishFinder combines hatch knowledge with live gauge alerts, Prime condition indicators, and real angler intel — so you show up on the right day, not the wrong one.
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