California Fly Fishing in December: Winter Trout & Steelhead

01December Fly Fishing Overview in California

December marks a transition period for California's diverse fly fishing opportunities, with cooler temperatures and variable precipitation creating unique conditions across the state's watersheds. While high-elevation streams may face winter closures or challenging access, lower-elevation rivers and tailwaters often provide their most consistent fishing of the year. The Golden State's geographic diversity becomes particularly apparent this month, with coastal steelhead runs reaching peak activity while inland trout waters settle into winter patterns.

Water temperatures drop into optimal ranges for trout activity, particularly in the 45-55°F sweet spot that triggers aggressive feeding behavior. Rain events, when they occur, bring fresh water into coastal systems and can activate steelhead migrations. Meanwhile, California's renowned tailwater fisheries maintain stable flows and temperatures, creating predictable conditions for technical dry fly and nymph fishing.

December's shorter daylight hours concentrate the best fishing into midday windows, typically from 10 AM to 3 PM when water temperatures peak and insect activity is most likely. Anglers who understand how to adapt their techniques and fly selection to winter conditions will find December to be one of California's most rewarding months for consistent, quality fishing.

02Top Rivers and Waters for December

Lower Sacramento River

The Lower Sacramento River from Redding to Red Bluff represents California's premier winter trout fishery. December finds this tailwater in prime condition, with consistent 52-56°F water temperatures maintained by Shasta Dam's bottom releases. The river's abundant insect life remains active throughout winter, providing steady feeding opportunities for the system's famous rainbow and brown trout populations.

December fishing centers on midge emergences that occur throughout the day, with peak activity during the warmest afternoon hours. Trout hold in predictable winter lies: deeper pools, slower runs, and inside bends where current breaks provide relief from the main flow. The river's excellent public access and consistent fish populations make it ideal for anglers seeking reliable winter action.

McCloud River

The McCloud River's spring-fed nature makes it a December standout, maintaining stable flows and temperatures even as other systems fluctuate with weather patterns. This iconic wild trout stream holds native rainbow trout that remain active throughout winter, particularly during midday warming periods. The river's crystal-clear water demands precise presentations and careful approaches, but rewards skilled anglers with some of California's most beautiful wild fish.

December conditions on the McCloud favor subsurface techniques, with nymphing producing the most consistent results. The river's relatively small size allows anglers to read water effectively and target specific holding spots where trout concentrate during winter months.

Owens River

The Owens River system, including both the upper and lower sections, provides excellent December fishing opportunities. The lower river, below Pleasant Valley Reservoir, maintains good flows and supports a robust population of wild brown trout that feed actively during winter months. Water temperatures remain fishable throughout December, though morning and evening periods can be quite cold.

The upper Owens, while more challenging to access in winter conditions, offers exceptional fishing for larger brown trout that move into shallow spawning areas during late fall and early winter. These post-spawn fish are often aggressive and provide exciting fishing for anglers willing to brave colder conditions.

Coastal Steelhead Streams

December represents peak season for California's coastal steelhead runs, with numerous rivers from the Russian River north to the Klamath receiving fresh fish. The timing and success of these runs depend heavily on rainfall patterns, with significant storm events triggering upstream migrations. Rivers like the American, Feather, and Yuba systems can provide exceptional steelhead fishing when conditions align.

These anadromous rainbow trout require different techniques than resident trout, with swinging flies and aggressive streamer presentations often proving most effective. December steelhead are typically bright, strong fish that provide some of California's most exciting fly fishing opportunities.

03December Hatch Report

Midge Emergences

Midges dominate December insect activity across California's trout waters. These tiny dipterans remain active even in cold water, providing consistent feeding opportunities throughout the month. Emergences typically occur during the warmest parts of the day, usually between 11 AM and 3 PM, when water temperatures peak.

Midge fishing requires precise techniques and small flies, typically sizes 18-24. Pupae patterns fished in the film often outproduce dry fly imitations, as trout focus on emerging insects rather than adults on the surface. The slow, methodical nature of winter midge fishing rewards patience and technical skill.

Baetis (BWO) Activity

Blue-Winged Olives remain active on many California waters through December, particularly during overcast, mild days. These mayflies prefer stable weather conditions and can provide excellent dry fly fishing opportunities when they emerge. BWO emergences typically occur during the warmest part of the day and can last for several hours when conditions are right.

The BWO Comparadun and RS2 emerger patterns prove effective during these hatches. Trout often feed selectively during BWO emergences, making careful observation and precise matching of the hatch essential for success.

Winter Stoneflies

Several stonefly species remain active through December, particularly on freestone streams throughout the state. These hardy insects provide important protein sources for trout during winter months when other food sources are scarce. Winter stonefly nymphs are available to trout year-round, making nymph patterns consistently effective.

Adult winter stoneflies emerge on warmer days, creating opportunities for dry fly fishing with Little Black Stonefly patterns. These emergences are often sporadic and weather-dependent, but can provide exciting fishing when they occur.

04Recommended Flies for December

Essential Nymph Patterns

December's subsurface focus makes nymph selection critical for consistent success. The Flashback Hare's Ear in sizes 14-18 remains one of the most versatile and effective patterns for California's December waters. Its buggy profile and subtle flash appeal to trout feeding on a variety of subsurface insects.

The Pheasant Tail Nymph in sizes 16-20 effectively imitates emerging BWO nymphs and remains a December staple. When tied with a copper bead, it sinks quickly and maintains a natural profile that triggers strikes from selective winter trout.

Mysis Shrimp patterns prove invaluable on tailwater systems where these crustaceans form a major part of the trout's diet. Sizes 14-18 in natural colors closely match the prevalent food sources in dammed river systems.

Dry Fly Selections

Despite December's focus on subsurface fishing, dry fly opportunities exist during warmer periods and insect emergences. The BWO Comparadun in sizes 18-22 handles Blue-Winged Olive emergences effectively, while its low-riding profile works well in calm water conditions typical of winter fishing.

Griffith's Gnat patterns in sizes 20-24 imitate clustering midges and can trigger surface feeding during heavy emergences. This pattern's versatility makes it valuable for both specific midge hatches and general prospecting.

Streamer Patterns

December's higher water levels and more aggressive trout feeding make streamers an important component of the fly selection. The Woolly Bugger in olive, brown, and black proves effective across all California waters, with sizes 6-10 covering most situations.

The Clouser Minnow in natural baitfish colors works well in larger rivers and for targeting steelhead in coastal systems. Its weighted eyes help it reach deeper water where winter fish often hold.

Egg Patterns

Post-spawn conditions on many waters make egg patterns valuable December tools. The Blood Dot Egg in sizes 10-14 imitates natural salmon and trout eggs that wash downstream after spawning activities. These patterns can be extremely effective in areas below spawning redds.

05Gear and Equipment for December Conditions

Rod Selection

December's variable conditions call for versatile rod choices that handle both delicate dry fly work and heavier nymph rigs. A 9-foot, 5-weight rod provides the best all-around performance for most California waters during December. This setup offers sufficient backbone for longer casts and fighting larger fish while maintaining the sensitivity needed for detecting subtle winter takes.

Anglers focusing on steelhead or larger rivers may prefer 6 or 7-weight rods that handle larger flies and stronger fish more effectively. The additional power helps turn fish in heavy current and provides better line control in windy conditions common during December.

Line and Leader Systems

A weight forward floating line handles the majority of December fishing situations effectively. The heavier front section helps turn over indicator rigs and provides better control in windy conditions. Having a sink-tip line available extends fishing options for deeper water and streamer fishing.

Leaders should be longer than summer setups to account for lower, clearer water conditions. 9-12 foot leaders tapered to 4X or 5X tippet provide the delicacy needed for spooky winter trout. Fluorocarbon tippet offers advantages in clear water conditions common during December.

Essential December Gear

Layered clothing systems are crucial for December comfort and safety. Base layers that wick moisture, insulating mid-layers, and waterproof outer shells prepare anglers for changing conditions throughout the day. Quality gloves that allow finger dexterity for fly changes are essential, with fingerless designs or flip-back fingertips proving most practical.

Waders with good insulation become important as water and air temperatures drop. Neoprene waders provide warmth but can be bulky, while breathable waders with insulating layers offer more versatility. Quality wading boots with good traction are crucial on potentially icy rocks and banks.

Strike indicators become more important in December as visual takes decrease with lower light and subdued fish behavior. Yarn indicators, foam indicators, and small floats all have applications depending on water conditions and techniques used.

06Techniques for December Success

Nymphing Strategies

December's cold water conditions make nymphing the most consistently productive technique across California waters. Two-fly rigs work well, with a larger attractor pattern as the point fly and a smaller, more imitative pattern as the dropper. This combination covers different feeding preferences and water columns simultaneously.

Dead drifting nymphs through likely holding water produces the most consistent results. Focus on deeper pools, slower runs, and areas where current breaks provide shelter for winter trout. Mending techniques become crucial for achieving natural drifts in the varied current conditions typical of December flows.

Euro nymphing techniques prove particularly effective in December's clear, low water conditions. The tight-line connection provides excellent sensitivity for detecting subtle takes while maintaining precise depth control through varying water conditions.

Dry Fly Approaches

When surface activity occurs, usually during the warmest parts of the day, precise presentations become critical. Winter trout are typically more selective and spookier than their summer counterparts, requiring longer, more delicate approaches and drag-free drifts.

Focus dry fly efforts on slower water where insects are more likely to accumulate and trout can inspect offerings without fighting heavy current. Back eddies, inside bends, and the soft water below boulders often hold feeding fish during winter hatches.

Streamer Techniques

December's more aggressive fish behavior makes streamer fishing productive, particularly during overcast conditions or in deeper water. Vary retrieval speeds from slow, methodical strips to faster, erratic movements that trigger predatory responses.

Fish streamers through deeper pools and runs where winter trout concentrate. Pay particular attention to structure like fallen trees, undercut banks, and boulder gardens where baitfish seek shelter and predatory trout ambush prey.

07Safety and Access Considerations

December conditions in California can change rapidly, making safety preparations essential. Weather systems can bring rain, snow at elevation, and rapidly changing conditions that affect both access and safety on the water. Check road conditions and weather forecasts before heading out, particularly for higher elevation destinations.

Shorter daylight hours limit fishing time and require earlier starts to maximize productive periods. Plan trips to take advantage of the warmest part of the day, typically mid to late morning through mid-afternoon. Inform others of your plans and expected return times when fishing alone.

Water levels can fluctuate with storm events, making previously safe areas potentially dangerous. Be aware of upstream dam releases and precipitation that could affect flow conditions. California's stream access laws remain important to understand, particularly on private lands where winter access may be more restricted.

08Regional Variations

Northern California

Northern California's December conditions vary dramatically with elevation and proximity to the coast. Coastal streams focus on steelhead opportunities, while inland waters provide consistent trout fishing. The region's diverse geography means conditions can range from freezing temperatures in the mountains to mild, fishable conditions in lower elevations.

Central Valley Systems

The Central Valley's tailwater fisheries, including the Lower Sacramento and lower reaches of Sierra Nevada drainages, provide the most consistent December fishing in the state. These systems maintain stable temperatures and flows that support active fish populations throughout winter.

Southern California

Southern California's mild December climate often provides excellent fishing conditions, though water availability becomes the limiting factor in many areas. High desert areas may experience freezing conditions, while coastal areas remain temperate and fishable throughout the month.

09Planning Your December Trip

December fishing success in California depends heavily on flexibility and preparation. Monitor weather patterns and stream conditions leading up to planned trips, as rain events can dramatically change fishing conditions. Have backup plans that account for different water levels and weather scenarios.

Book accommodations early for popular destinations, as December's holiday season can increase demand in tourist areas. Consider midweek trips that avoid weekend crowds and often provide better fishing conditions.

Pack for variable conditions, including extra clothing, food, and emergency supplies. December weather can change rapidly, and being prepared ensures both safety and comfort throughout the day.

10Sources & References

For current fishing conditions and regulations:

• California Department of Fish and Wildlife - Fishing Information
• California State Parks - Fishing Opportunities
• U.S. Bureau of Reclamation - Central Valley Operations
• USGS California Water Data
• Trout Unlimited California Chapters
• California Fly Fishing Reports and Conditions