Cold weather fly fishing gear

Winter is when Colorado tailwaters are at their best and least crowded, which is why people fish in February at all. It is also the season where equipment decisions have the most direct effect on how long you last, and where the failure mode is specific and predictable.

You will not be defeated by being cold in general. You will be defeated by your hands. Once you lose enough dexterity to tie a size 20 fly onto 6X tippet, the day is over regardless of how the fish are behaving. Almost everything below is downstream of that fact.

Why this is not the same as winter hiking

Two things make fly fishing in the cold a different problem from other winter activities.

First, you are standing still. There is no exertion generating heat, and long periods of near-immobility next to a large volume of near-freezing water drain you steadily rather than in the burst that hiking layers are designed for.

Second, and this is the one people get wrong: waders compress your layers. Breathable waders press everything flat against your legs, and most insulation works by trapping air in loft. Flatten the loft and the insulation stops insulating. A jacket-weight down or synthetic fill that keeps you warm above the waist does very little below it.

Layering under waders

Above the waist, the usual rules apply and a wind layer matters more than another insulating one. Wind is what converts a manageable cold day into an unmanageable one, and a shell costs almost nothing to carry.

Hands

Feet

The counter-intuitive part: fit does more for warm feet than insulation does. Circulation is what keeps feet warm, and boots tightened over thick socks restrict it, which is why people wearing the heaviest socks often have the coldest feet.

• Size your boots for winter socks, then wear thinner socks in summer. Oversized boots with thick socks beat tight boots with thicker socks, every time.
• Wool or synthetic socks only. Two thinner pairs are often better than one thick pair, provided the boots have room.
• Consider bootfoot waders if you fish cold water often. They are less precise to walk in and noticeably warmer, because there is more air around the foot.
• Studs or a grippy compound. Winter means icy rock on the bank as well as slick rock in the river, and the bank is where most falls happen.

More on soles, fit and the biosecurity rules on felt under waders and boots.

What the cold does to line and leader

Equipment behaves differently near freezing, and knowing how saves a lot of frustration that feels like your casting falling apart.

• Fly line stiffens. It develops memory, coils, and does not shoot through the guides as it did in August. Stretching the first few yards before you start genuinely helps.
• Ice forms in the guides. This is the recurring chore of winter fishing rather than an occasional annoyance. Clearing them by hand works; some people use a line dressing or lip balm on the guides, with mixed results.
• Monofilament and fluorocarbon get less supple, which slightly worsens the drag problem that fine tippet exists to solve. Not a reason to go heavier, just a reason to mend more.
• Knots need more care. Cold stiff material seats badly, and a knot tightened with numb fingers on stiff tippet is the knot that fails on a good fish. Lubricate and pull slowly.
• Floatant thickens or solidifies. Keep it in an inside pocket if you intend to fish dries.

What changes about the fishing itself

Gear is only half of it. Cold water slows a trout's metabolism, so fish hold in deeper slower water, feed less often, and will not move far for a fly. The window you have to put something into is small.

The practical consequences: fish deeper and slower than instinct suggests, expect takes to be subtle rather than obvious, and treat depth as the variable to adjust rather than pattern. Most blank winter days are fished above the fish. See nymph rigs and why yours is not getting deep enough, and the Colorado fly box for what winter actually calls for.

Where to go matters too. In winter this mostly means tailwaters, because they stay cold but stable while freestones lock up. Our river guides label which is which, and what a tailwater day asks of your gear covers the rest of that situation.

Safety, which matters more in winter than any other season

Going in is worse in January than in July by a considerable margin. Cold water removes your ability to help yourself within minutes, and there is nobody else on the bank to notice.

• A wading staff. Icy rock is not the same as wet rock, and a third point of contact changes what you can stand up in.
• A tight wading belt. It limits how much water gets in if you go over.
• Dry clothes in the car. In winter this is the difference between an embarrassing story and a genuine emergency.
• Tell someone where you went, particularly on canyon water with no signal.
• Fish with someone when you can. The cheapest safety equipment there is.
• Watch the short days. A headlamp weighs nothing, and a canyon gets dark considerably earlier than the forecast sunset suggests.

And the judgement call that no equipment replaces: if you are not confident you can stand up in it, fish from the bank. Nothing on this page is a safety assessment of any river or of conditions on a given day.

When to call it

Knowing when to stop is part of the skill rather than an admission of defeat. Reasonable reasons to go home: you cannot tie a knot any more, you are shivering and it is not stopping after a warm-up, your feet have stopped reporting in, or the ice in your guides is forming faster than you can clear it.

None of those improve by being ignored, and all of them are the beginning of something worse rather than the discomfort itself.

What to check before a winter trip

1. The gauge for your reach on USGS current water data. Tailwater releases change for management reasons in winter, not just weather.
2. Water temperature, where the gauge reports it. It tells you where in the river to look.
3. Regulations and closures with Colorado Parks and Wildlife. Some winter water carries its own restrictions.
4. Road and access conditions. A canyon road in February is its own consideration, and a closed gate ends a trip more reliably than any river condition.