The 8 Best monofilament lines for trout fishing


The most commonly used line for trout fishing is monofilament or nylon with a breaking strain of 4 to 6lb.

Experience fishermen might go as low as 2lb when targeting small trout in very clear water. Anglers targeting trophy trout or steelheads might go as high as 12lb.

The line you fish with is one of the most important parts of your fishing setup. It is what connects your ‘lure’ with the reel.

It has to survive getting cast, and reeled back in hundreds of times. It will rub against rocks, branches, and even the fish itself. While it might be tempting, fishing line is not a place to save a few dollars on an inferior product

How to determine which breaking strain to use?

A rough guide is to use line no weaker than half the weight of the fish you are expecting to catch. So if the biggest fish you expect to catch is 6lb. Then you can usually get away with 4lb line. Because water suspends the trout during the fight, the line does not have to ‘carry’ the entire weight of the fish. So it is possible to catch fish that weigh massively more than the breaking strain of the line you are using.

Buy your line based on diameter rather than breaking strain

When choosing which line to use, I suggest basing your decision on line diameter rather than breaking strain. It tends to be a more accurate indicator of line strength, than the breaking strain written on the package.

A 6lb line, should be no thicker than 0.009″ (0.23mm), while a 4lb line should be around 0.008″ (0.20mm). True 2lb lines are rare, but they typically have a diameter of around 0.005″ (0.12mm).

If you buy a 0.01″ line, such as Berkley Trilene XT, you can be assured it will break at quite a bit over the advertised 6lb. It will also be that much more visible to the trout, and the extra thickness will undoubtedly increase resistance reducing casting distance.

I have tested the breaking strain of quite a few lines over the years, and I can tell you. That the much thinner Sunline Super Natural breaks very close to the advertised breaking strain, while most other brands over test by quite some margin.

Specifications of various trout lines

What is the best breaking strain fishing line for trout
Imported line I have been testing. It is nice, but not worth the hassle to obtain

Monofilament vs Fluorocarbon vs braid / superline mainlines

While this article predominantly discusses monofilaments. I need to touch upon the other line types used for fishing. These are fluorocarbons and braids.

For trout fishing, my favorite line is braided Superlines, such as fireline or sufix fuse. I have gone into a lot more detail why I favor superlines in an earlier article. I have summarized below why I consider fireline to be the best mainline for trout fishing.

  • + Superline do not stretch, allowing every touch, bump, and vibration to be felt.
  • + Extremely thin diameter allowing for longer casts.
  • + Superline has next to no memory, no need to worry about line twists.
  • + Superline, unlike braid plays nicely with ultralight spinning reels even at low breaking strains
  • – Thin superline can easily cut the skin.
  • – Requires specialized knots.
  • – It is very visible in the water, and requires the use of a leader.
  • – Requires tools to cut, I can not bite through it.
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The case for and against Fluorocarbon

To keep up to date with current and past trends in trout fishing I spend a lot of time reading blogs and articles.

There are quite a few websites, some with questionable authenticity that sing praises for trout fishing with Fluorocarbon mainlines.

I personally feel fluorocarbon has some serious drawbacks and few advantages when it comes to ultralight spin fishing.

Let’s just start at the biggest negatives.

Memory, and the resulting tangles, wind knots, and eventual bird nests.

Fluorocarbon simply does not play nicely with ultralight spinning gear. It requires constant attention to prevent it from exploding into a nest of tangles. It is simply too stiff for lightweight spin fishing.

Fluorocarbon also has much weaker knot strength, we are already fishing very light lines. This is not good news when the mainline is only 4lb.

I remember when many advertisements use to claim the ‘low stretch’ nature of Fluorocarbon. This is simply not true. Fluro, stretches as much if not more than traditional nylons.

To make matters even worse. When Fluro is overstretched, it does not rebound to its original dimensions. It stays stretched out… Do this too many times and it results in premature line breakage.

No rant against Fluorocarbon mainlines will be complete without referring to its number one claim to frame. That Fluorocarbon is nearly invisible in the water. To the human eye, that is true. Fluorocarbon is much tougher for us to see. But, in my experience trout simply do not care.

I have spent years fly fishing to trophy size brown trout in some of the clearest trout rivers around. These trout are veterans. They have seen all types of lines and presentations. When fishing for these trout, I do not think twice before tying on a dry fly and a few feet of nylon tippet. If my presentation is good, and there is no drag chances are the hungry trout will rise to the surface and gobble up my fly.

If a trout accepts a minuscule dry fly tied to a nylon tippet, there is no chance it will turn down a ‘gigantic’ spinner attached to a similar line. Now, I do use fluorocarbon when fly fishing, but only for nymphing and other presentations when I want the line to sink quickly.

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Before I finish, I must quickly cover the advantages. It does have very good abrasion resistance.

This is always nice, but a high abrasion-resistant line is not a requirement for trout fishing. It also sinks faster than monofilament.

This characteristic makes it very useful for nymph fishing but it does not make much of a difference when spinning with lures.

Keep in mind, this is only discussing the use of fluorocarbon as a mainline, on ultralight spinning tackle.

It is actually quite good as a dedicated leader material, and from what I understand it behaves quite differently when fished on baitcaster in heavier breaking strains.

Which breaking strain to use for trout fishing

When choosing a fishing line for your spinning reel, it is important to match the line with the reel, rod and the size of fish you plan on targeting. Using the wrong breaking strain of line can result in lost fish, reduced casting distance or even a broken rod. All things we want to prefer.

Nearly all rods and reels have a line class line or weight printed on them. In the case of trout reels the line capacity will be printed on it, for example 110yd/6lb, sometimes the dimensions are printed alongside 140m/0.20mm. Line breaking strain is usually in Imperial (sometimes metric) while the line diameter is most often in metric.

Rods normally give a range. Most trout rods are rated for between 2-8lb or 1-3kg. Sometimes, rod manufacturers do not give a line weight, but only the lure weight the rod is designed to cast. So you will see something like 1/16oz-1/2oz instead.

What line weight for stream trout

I suggest using 4lb line for small stream trout, look for a line with a diameter no thicker than 0.008″.

This is an ideal line for targeting the tiny stream trout, such as brook char which live in the foothills of the Appalachian mountains.

Just take care when tightening knots and fighting fish. . There is not much margin of error. If your line suffers from any abrasion, I suggest cutting off the damaged portion of line.

My preferred 4lb lines are Maxima Ultragreen or Sunline Super Natural.

What line weight for Steelhead fishing?

The best breaking strain to use for steelhead fishing is between 8-12lb. Most of the time I use a mainline with a diameter of around 0.01″ or 0.25mm. This is approximately 8lb.

Steelhead trout are larger, and fart stronger than most. So anglers use slightly stronger lines. On North American rivers over 90% of steelhead fishermen use line between 8-12lb in breaking strain.

If the river is fast, and the current strong anglers tend to use slightly heavier line to better control the fish. When fishing from boat’s 8lb line can be used. Many steelhead anglers also use a leader of between 10-15lb, but a thinner diameter leader spooks less fish in clear conditions.


My preferred line to use for Steelhead fishing is Sufix Elite

What line weight for Searun trout

I generally use a 0.009″ line (0.23mm) when targeting searun brown trout. This has a breaking strain of around 6-8lb

Searun trout are bigger and fight harder than river trout. So the line used by dedicated fishermen has a slightly higher breaking strain. The ideal breaking strain to use also depends largely on where you plan on fishing.

Some rivers simply have larger, more powerful sea run trout. Such as Lake Thingvallavatn in Iceland or the Rio Grande in Argentina where the trout can exceed 30lb in weight. In such trophy trout waters 12lb line is often recommended.

My preferred lines to use for sea run trout and steelhead is Sufix Elite or Stren Original

Can trout see bright color fishing lines?

Fishing line comes in many colors, but for trout fishing, conventional wisdom favors clear, less visible line. Many lines have a green, blue, or even whitish tinge… I am not aware of the slight variations in color really matter.

People often believe trout do not strike when they can see the line, but that is far from the truth. They normally see micro drag or something else unnatural which convinces them not to strike. So, can trout be caught on high-vis orange or yellow mainlines? Probably, but I have never met anyone brave enough to try. So why take the risk?

These bright colors lines exist to be easier to see. Not only for anyone with poor eyesight but for birds. It is not a big concern for spin fishermen, but bird strike can be a real consideration for some sea fishermen. If you trout fish with high visibility lines I will love to hear your feedback in the comments below.

Best fishing line for trolling?

Most of the time, a thin line works best when trolling because it sinks through the water faster. For this reason, braided fishing lines such as fireline work extremely well for trolling.

If you wish to stick with monofilament, I suggest a line such as Stren Megathin or Sunline Super Natural due to their low diameter. Megathin, is likely the better of the two thanks to less memory.

When to replace fishing line?

If you are unsure whether your line needs to be replaced or not, I have just written a guide here explaining when to replace your fishing line.

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Sean Campbell’s love for hunting and outdoor life is credited to his dad who constantly thrilled him with exciting cowboy stories. His current chief commitment involves guiding aspiring gun handlers on firearm safety and shooting tactics at the NRA education and training department. When not with students, expect to find him either at his gunsmithing workshop, in the woods hunting, on the lake fishing, on nature photoshoots, or with his wife and kid in Maverick, Texas. Read more >>