Swimming in the ocean is fundamentally different from swimming in a pool. There’s no lane line to follow, no wall to grab, and the water is constantly moving. The good news is that with a few key skills and some awareness of your environment, ocean swimming is safe, exhilarating, and surprisingly manageable. Here’s what you need to know before you wade in.
Check Conditions Before You Get In
The ocean changes hour by hour, so the first skill isn’t physical. It’s observational. Before entering, spend a few minutes watching the water from the beach. Look for where waves are breaking and, just as importantly, where they aren’t. A gap in the breaking waves, especially one paired with foam, seaweed, or discolored water pulling offshore, is often a rip current. These channels of fast-moving water pull swimmers away from shore and are responsible for the vast majority of ocean rescues.
Beach flags tell you what lifeguards already know. Yellow means moderate surf or currents, and weak swimmers should stay out. Red means rough conditions with strong surf or currents, and all swimmers are discouraged from entering. Double red means the water is closed entirely. A purple flag means stinging marine life like jellyfish or stingrays are present. Some beaches fly a green flag for calm conditions, though the International Life Saving Federation doesn’t endorse green flags because no ocean conditions are ever completely safe.
Water temperature matters more than most people realize. Below 60°F (about 15°C), the risk of cold water shock and hypothermia increases significantly, especially when air temperature is more than 15 degrees warmer than the water. If you’re swimming in cool water, a wetsuit isn’t optional. It’s the difference between a comfortable swim and a dangerous one.
Finally, check the tide. As the tide comes in, beaches that looked wide and safe can flood quickly. If you’ve walked around rocks or into a cove at low tide, the returning water can cut off your route back. Know roughly when the tide turns so you aren’t caught off guard.
Getting Through the Waves
The hardest part of ocean swimming for beginners is the transition zone: that churning band of breaking waves between the dry sand and the calmer water beyond. Walking in slowly and getting battered by wave after wave wastes enormous energy. Instead, wade in steadily until the water reaches your thighs, then commit.
When a wave is about to hit you, dive under it. Time your dive so you’re going beneath the wave just before it breaks on top of you. Push your body down, point your head toward the sandy bottom, and let the wave’s energy roll over your back. This is sometimes called a duck dive (surfers use the same principle with their boards). The key is depth: get low enough that the turbulence passes above you. Once the wave passes, surface, take a breath, and keep moving forward. Repeat until you’re past the break zone, where the water calms down considerably.
Coming back in is the reverse challenge. Swim toward shore until you feel the waves start to lift you. Body surf with them if you can, or let them push you while protecting your head with your arms extended forward. Never dive headfirst into shallow water near shore.
Swimming Technique in Open Water
Pool strokes work in the ocean, but you need one additional skill: sighting. Without a black line on the bottom, you will drift off course. Every 8 to 12 strokes, lift your eyes just above the waterline to spot a landmark on shore, a building, a lifeguard tower, a pier. This technique is called “crocodile eyes” or “alligator sighting.” You press down slightly harder with your lead arm and increase your kick strength to raise your upper body just enough to peek forward, then drop your head back into normal position. The whole look takes about one second.
Freestyle (front crawl) is the most efficient stroke for distance ocean swimming. Breaststroke works well for a more relaxed pace and gives you a natural forward view with every stroke, which helps with navigation. Backstroke is generally a poor choice in the ocean because you can’t see waves coming and you’ll lose all sense of direction.
Be aware of longshore currents, which run parallel to the beach. These won’t pull you out to sea, but they’ll push you sideways along the shore. After 15 minutes of swimming, you might look up and realize you’re 200 yards down the beach from where you started. Pick a landmark on shore before you start and check it regularly. If a longshore current is moving you toward rocks, a pier, or another hazard, swim directly back to the beach rather than fighting the lateral pull.
What to Do If You’re Caught in a Rip Current
Rip currents kill more beachgoers than sharks, hurricanes, and lightning combined. They’re narrow channels of water flowing away from shore, and they can move faster than an Olympic swimmer. If you feel yourself being pulled out, the single most important thing is this: do not swim against it. You will exhaust yourself and drown.
Instead, swim parallel to the shore. Rip currents are typically narrow, sometimes only 20 to 30 feet wide. A short swim to the side will carry you out of the channel and into water that’s moving back toward the beach. Once you’re free of the pull, angle toward shore. If you’re too tired to swim at all, float on your back, wave your arms, and yell for help. The current will eventually weaken as it moves further from shore. Staying calm and conserving energy is more important than any swimming technique.
Treading Water and Resting
In a pool, you grab the wall when you’re tired. In the ocean, you need to be comfortable resting in deep water. The most energy-efficient approach is simply floating on your back. Saltwater is denser than fresh water, so you’ll float more easily than you do in a pool. Spread your arms and legs, arch your back slightly, and let the water support you.
When waves make back-floating impractical, treading water is your fallback. The egg beater kick, where your legs rotate in alternating circles beneath you, is the most efficient method. Pair it with gentle sculling motions of your hands (small figure-eight movements at your sides). This keeps your head above water with minimal effort. Bicycle kicking and breaststroke kicks also work but burn more energy over time. Practice treading in calm water until you can do it comfortably for several minutes without fatigue.
Gear That Makes a Difference
You don’t need much equipment for ocean swimming, but a few items are worth considering. Goggles with tinted or mirrored lenses reduce glare from the sun on the water and make sighting much easier. A bright swim cap, preferably neon orange or yellow, makes you visible to boats, jet skis, and anyone watching from shore.
A swim buoy is one of the smartest investments for regular ocean swimmers. It’s an inflatable float that tethers to your waist and trails behind you as you swim. It serves three purposes: it makes you highly visible in bright fluorescent colors, it gives you something to rest on if you get tired, and many models have a waterproof compartment for your keys, phone, or ID. The drag is minimal once you get used to it.
If water temperatures are anywhere near 60°F, wear a wetsuit. Even in warmer water, a thin wetsuit adds buoyancy that reduces effort and keeps you warmer over longer swims.
Dealing With Marine Life
Most ocean creatures want nothing to do with you. Jellyfish are the most common encounter, and if you get stung, the best treatment is soaking the affected skin in hot water between 110 and 113°F (hot but not scalding) for 20 to 45 minutes until the pain fades. Do not rinse with fresh water, urine, alcohol, or ammonia. All of these are either useless or can make the sting worse. Don’t scrape the stingers or rub the area with a towel.
Shuffle your feet when walking in sandy shallows to avoid stepping directly on a stingray. This gives them a chance to move. If you do get stung, hot water is again the go-to treatment. For any sting near the eyes or any sign of a severe allergic reaction (difficulty breathing, swelling of the face or throat, chest tightness), get emergency help immediately.
Build Up Gradually
If you’re comfortable in a pool but new to the ocean, start in calm, shallow water on a day with small waves and no current. Swim parallel to shore in waist-to-chest-deep water where you can stand up anytime. Get used to the salt, the way swells lift and lower you, and the feeling of not having a wall nearby. As your confidence grows, move into deeper water and gradually extend your distance. Swim with a buddy or in a group whenever possible, and always tell someone on shore where you’re going and how long you plan to be out.