Your first month of open water swimming

Open water looks peaceful from the shore. It's more demanding than you expect, but also more rewarding. Here's what the first month looks like: building cold-water tolerance, learning to navigate without lane lines, and the moment it finally starts to feel natural.

By Colin B. · Published June 8, 2026

You can already swim. That’s the prerequisite for open water swimming, and it’s not a small one. But “I can swim” and “I can swim in a lake” are different things, and your first month is mostly about learning what’s different rather than learning to swim.

The differences are real: no lane lines, no black stripe on the bottom, cold water that costs you energy before you’ve gone anywhere, sun glare that makes you feel half-blind, and navigation that requires a whole new skill. None of this is insurmountable. Most of it resolves within a few sessions. But going in knowing what to expect makes the first month dramatically less disorienting.

Week 1: The cold shock is the lesson

Your first open water swim will probably feel like an overreaction. You step in, the cold hits your face and neck, and your body does something involuntary: breathing speeds up, your heart rate spikes, your chest gets tight. This is cold shock, and it’s a physiological response, not a sign you’re in trouble.

The fix is slow entry. Walk in. Splash water on your face and neck before you submerge. Pause for thirty seconds after your ears go under. Your breathing will normalize within 60-90 seconds. Every time you swim, this gets faster and less dramatic. By week four, you’ll barely notice it.

Don’t start by trying to swim a distance. Your first session goal is getting comfortable with the entry and the environment. Swim 100m. Feel how different the water feels without a pool wall to hang onto. Come back in. That’s a successful first session.

One more thing about week one: don’t swim alone. This isn’t overcaution. It’s the rule that every experienced open water swimmer repeats without exception. Bring a buddy, swim in a group, or choose a venue with lifeguard supervision. Your tow float helps; a swim partner is better.

Week 2: Learning to sight

By week two, the cold entry is less shocking and you can focus on the actual skill that separates open water swimming from pool swimming: sighting.

Sighting is the technique of briefly lifting your eyes above the waterline to spot a landmark and confirm you’re swimming in the right direction. Without it, most swimmers drift 20-30% off course within the first 100m. The drift isn’t random; it tends to be consistent for each swimmer (most people pull slightly left or right), which means you’ll pattern your errors once you know to look for them.

The technique: every 8-10 strokes, as you’re beginning your arm pull and before your face rises to breathe, lift your eyes just above the waterline. Spot your landmark (a buoy, a tree, a tower on the far shore), then breathe and continue. You’re barely lifting your head; just your eyes. The whole sight takes half a second.

Getting this wrong is normal. Beginners either lift their heads too high (exhausting, slows you down, and the resulting hip drop kills your position) or don’t lift high enough to actually see anything. It takes 3-4 sessions to find the right height automatically. Once it’s automatic, you stop thinking about it.

Practice on a short loop: pick two landmarks, swim from one to the other sighting every 10 strokes, note how far you drifted. Correct and repeat. This drill teaches you more about navigation in one session than any amount of video-watching.

Week 3: Your stroke adapts

In a pool, you can breathe to the same side every time because you know the wall is 25m away. In open water, you want to breathe bilaterally (alternating sides) so you can see both sides of your course and aren’t locked into breathing toward glare or chop.

If you’re a one-sided pool swimmer, week three is when this catches up with you. Your neck will be sore the first few times you breathe to your off side. Your stroke timing will feel off. This is temporary, and working through it is worth it.

Your stroke will also naturally shorten in open water. The absence of a wall to push off changes your rhythm, and the chop (even mild wave action) interrupts your usual pattern. Don’t fight it. Most experienced OWS swimmers develop a slightly shorter, quicker stroke than their pool stroke, which is more stable in moving water.

The other thing that happens in week three: you stop swimming to the wrong place. The sighting finally works, your drift shrinks, and you feel the satisfaction of reaching a marker on the line you planned. That’s a disproportionately good feeling.

Week 4: Finding your people

Open water swimming has a community, and that community is one of the nicest things about it. The people who swim in cold lakes at 7am are a self-selected group with a tolerance for mild misery and a genuine enthusiasm for sharing it with strangers. Group swims are how most people find their regular venues, their pacing partners, and (often) their best training advice.

Look for local Masters Swimming clubs (USMS in the US), outdoor swimming groups on Meetup or Facebook, or organized venue swims at reservoirs and lakes. Most are welcoming to beginners. Showing up to three group swims is usually enough to find at least one person at your pace who becomes a regular swim partner.

By the end of month one, you have four things: a working entry routine, functional sighting, a bilateral-ish breathing pattern, and at least the start of a regular swim spot. That’s the foundation. Everything from here is just volume and distance.

What will still feel hard

A few things don’t resolve in month one and shouldn’t be expected to:

Cold acclimatization takes longer. Your tolerance for cold water builds over the course of a full season, not four weeks. The first swim of a new season always feels colder than the last swim of the previous one. This is normal; it comes back fast.

Turns and navigation at pace. Sighting while swimming slowly is one skill. Sighting while trying to hold your pace is harder. This is a month-three problem.

Open water anxiety. Some swimmers feel a baseline unease about deep water, murky water, and the absence of a bottom to see. For most people this fades with exposure. If it doesn’t fade after a full season, that’s worth paying attention to.

What to do next

The obvious next step is distance. If you swam 400m swims in week one, aim for 800m by the end of month two. But don’t only increase distance; vary your venues. Different water temperatures, different chop, different navigation challenges. Each new environment teaches you something a familiar one doesn’t.

And if month one has convinced you this is the sport, consider a local open water event. Most areas have beginner-friendly 1km swims in the calendar. Racing (even loosely) in a group resets your sense of pace and introduces you to a community you couldn’t have found otherwise.

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Ready to get in the water? See our open water swimming gear guide for the four things worth buying first and the gear you can skip for the first season.