Nobody Knows What Speed They’re Actually Trolling

Five people in a marina will give you five trolling speeds, all delivered with total confidence, spanning a factor of two.

That’s not because trolling is mysterious. It’s because speed is the one variable in the whole operation that people set by feel and then hold constant while adjusting everything else, without ever measuring it. Which means every conclusion drawn about lure, color, depth and line length is resting on a foundation nobody checked.

Speed is doing three jobs at once

It sets depth. This is the big one. The same crankbait at 1.8 mph and 2.6 mph runs at meaningfully different depths — faster generally means shallower, because the lure planes up. Change speed and you’ve changed depth without touching a thing, which is why speeding up to get past a boat can quietly take you out of the fish for ten minutes.

It sets action. Most lures have a speed range where they do what they’re supposed to. Too slow and a spoon rolls over rather than wobbling; too fast and it spins. A crankbait that’s blowing out — rolling onto its side instead of wobbling — is going too fast for its design. Every lure has a window and that window is narrower than people assume.

It sets willingness. Cold water usually means slower, because fish won’t chase far. Warm water often means faster works. Active fish will run down something moving quickly; neutral fish want it in front of them long enough to decide.

Those three don’t always point the same direction, and that tension is what makes speed interesting rather than a setting.

Two speeds, and they aren’t the same number

GPS speed over ground is how fast you’re moving relative to the earth. It’s what your electronics show.

Speed through water is how fast your lure is moving relative to the water around it, which is the number the fish experiences.

On a lake with no current, those match closely. On a river, in a reservoir with flow, or on a windy day with surface drift, they don’t. Trolling downstream at 2 mph over ground in 1 mph of current means your lure is only moving 1 mph through the water. Turn around and run upstream at the same GPS number and your lure is now doing 3 mph.

That’s why the same pass produces fish in one direction and nothing in the other, and why people conclude the fish are “on the north end.” Sometimes they are. Sometimes you just changed your lure speed by 200 percent.

If you troll moving water at all, a paddle wheel or a small in-line speed indicator is worth having.

How to test it properly

One variable at a time, which is the whole ballgame. The one-variable field test lays out the general method; on the water it looks like this.

Set two identical rods, same lure, same line length, same side. Run a pass at one speed. Change nothing but the speed and run it back. Then again. What you’re looking for is whether the fish respond, not whether you caught one — a follow, a hit that doesn’t stick, a fish that boils behind it all count.

The version most people run instead is changing speed, lure and depth in the same twenty minutes, catching a fish, and attributing it to whichever change felt most interesting.

Once you find a productive speed, write it down with the water temperature and the species. That’s the note that’s worth something next year, and it’s the whole reason for logging the decision rather than the fish.

The turn is free information

Here’s the trick that costs nothing.

When you turn, the lures on the outside of the turn speed up and the ones on the inside slow down. If you consistently get hit on the outside rods during turns, you’re trolling too slow. Inside rods, too fast.

That’s a test you’re running whether you notice it or not, several times an hour. Start noticing it and you’ll dial speed in faster than by any deliberate method.

S-turns and gentle curves rather than straight lines are worth doing for exactly this reason — they present every lure at a range of speeds continuously, which is a much better search than holding one number.

Small changes matter more than you’d expect

Two-tenths of a mile per hour sounds like nothing. On a walleye bite it can be the difference between a good afternoon and an empty cooler.

Which is an argument for being able to make small adjustments — a kicker motor, a trolling motor with fine speed control, or drag devices for slowing a boat that won’t go slow enough. A big outboard at its lowest idle is often faster than the fish want, and there’s no adjusting your way out of that.

Wind is the other half of it. A boat running with the wind is faster than the throttle suggests, and into it, slower. On a gusty day your actual speed is oscillating constantly, which is either a problem or a free variation test depending on how you look at it.

What this is really about

There’s a broader point here that goes past trolling.

Every presentation has a variable that people set once, by feel, and then treat as fixed while they fiddle with everything else. In trolling it’s speed. Jigging has cadence, fly fishing has depth, and bait fishing has how long you’re willing to leave it sitting there.

Those hidden constants are where most of the improvement is available, precisely because nobody’s looking at them. The fun variables — lure, color, the new thing in the box — have been picked over for decades.

Go find the number you’ve never measured.