Key takeaways

  • Swimming well in a pool is a great start, but lakes and the ocean add cold, waves, currents, no wall to grab and water you can't see through.
  • Before you swim far from shore, make sure you can do the five water competency skills in natural water, not only in a pool.
  • Never swim alone. A lifeguard isn't your buddy; bring a real one, and tell someone on shore your plan.
  • If you panic or tire, roll onto your back and float until your breathing settles.
  • Build distance slowly, inside a designated swimming area, and get out at the first sound of thunder.

Being a good pool swimmer is a great start, but open water asks more of you: cold, waves, currents, no wall to grab and water you can't see through. Before you swim far from shore, make sure you can do the five water competency skills in natural water, swim with a buddy, and build distance slowly inside a designated swimming area.

This guide is for confident pool swimmers, teens and adults, who want to swim in lakes and the ocean. It isn't a training plan for races. It's about the skills and judgment that keep you safe.

56%

of Americans who said they could swim could do all five basic water safety skills, in a 2020 American Red Cross survey.Source: redcross.org (opens in a new tab)

Why pool skill doesn't transfer automatically

In a pool, the water is warm, clear and still, the wall is never far, and the floor is always there. Natural water takes those away one by one.

Confidence can run ahead of skill. In the 2020 Red Cross survey above, 85% of Americans said they could swim, but only 56% of those self-described swimmers could do all five basic skills (opens in a new tab).

Water competency in natural water

The Red Cross defines water competency as water smarts, swimming skills and helping others (opens in a new tab). Its five core skills are:

  1. Enter water that's over your head, then return to the surface. (opens in a new tab)
  2. Float or tread water for at least 1 minute. (opens in a new tab)
  3. Turn over and turn around in the water. (opens in a new tab)
  4. Swim at least 25 yards. (opens in a new tab)
  5. Exit the water. (opens in a new tab)

Test yourself in natural water, close to shore and with a lifeguard on duty. Getting out is the one people skip: climbing out onto a muddy bank, a slippery dock or a boat can be much harder than using pool steps. Water Safety USA also notes that finishing beginner lessons doesn't always mean a person is water competent (opens in a new tab).

Check yourself with the tool below, and learn more in water competency: the 5 skills.

Interactive tool

Water competency self-check

Check yourself or your child against the five Red Cross water competency skills, see what to practise next, and review water smarts and safe helping.

Cold, waves and fatigue

Cold. Pools for Olympic competition are kept at 77-82°F (opens in a new tab). The National Center for Cold Water Safety says below 77°F, breathing is adversely affected (opens in a new tab), and that controlling your breathing becomes progressively more difficult as water temperature falls from 70°F to 60°F (opens in a new tab). NWS says cold shock can trigger gasping and rapid breathing in water as warm as 77°F (opens in a new tab). NWS also notes that warm air temperatures may not mean warm water (opens in a new tab), so lakes and the ocean can be much colder than a heated pool, especially early in the season. Learn the basics in cold water shock.

Waves and wind. NWS warns that at a surf beach, crashing waves, winds and dangerous currents (opens in a new tab) make swimming very different from a pool, and changing conditions can quickly use up your energy.

Currents. In the ocean, rip currents can pull even strong swimmers away from shore. NWS advice: relax and float first. If you can, swim out of the current along the shoreline or toward breaking waves, then angle back to the beach (opens in a new tab). Learn more in rip currents.

Fatigue. There's no wall to rest on. Plan distances you can easily swim back, and turn around early.

Swim with a buddy and a plan

U.S. Masters Swimming (USMS), the national adult swimming organization, is blunt: never swim alone (opens in a new tab). It adds that a lifeguard cannot be considered a buddy, because their primary duty is to protect all patrons, not just you (opens in a new tab).

Before each swim, USMS suggests you:

Swim sober. The Red Cross advises: swim sober (opens in a new tab).

Staying oriented and staying calm

Sighting. With no black line on the bottom, you have to look up to steer. USMS advises you to know the buoys or the next point you're aiming for, and sight more often in chop or current (opens in a new tab).

If you panic or tire. It happens to experienced swimmers, too. USMS advice: take slow, deep breaths. If you're in the water when panic strikes, roll over and float on your back until you feel ready (opens in a new tab). Practice floating in calm, shallow water so it feels natural when you need it.

Life jackets aren't only for beginners. CDC says weaker swimmers of all ages can use life jackets in and around natural water (opens in a new tab). If you're still building skills, wearing one while you swim near shore is a smart choice.

Where to practice safely

If you want to improve your strokes or build confidence first, adult lessons help at any level. See learning to swim as an adult.

What you can do today

For lake days with family, see lake swimming safety.

Common questions

Is open water swimming harder than pool swimming?

Yes, for most people. The National Weather Service says swimming in a pool is not the same as swimming at a surf beach with waves, wind and currents, which can drain your energy fast. The U.S. Army Corps of Engineers adds that swimming in natural water is different from swimming in a pool.

What skills do I need before swimming in open water?

Start with the five water competency skills the American Red Cross teaches: enter water over your head and come back up, float or tread for at least a minute, turn around in the water, swim at least 25 yards, and get out. Practice them in natural water, with a lifeguard nearby, before swimming farther.

What should I do if I panic in open water?

Slow down. U.S. Masters Swimming advises taking slow, deep breaths and, if panic strikes in the water, rolling onto your back to float until you're ready to go again. Signal for help if you need it. A life jacket or a float to rest on makes this much easier.

How cold is too cold for open water swimming?

The National Center for Cold Water Safety says to treat any water below 70°F with caution, and that breathing becomes progressively harder to control as water falls from 70°F to 60°F. Cold shock can also cause gasping in water as warm as 77°F, according to the National Weather Service.

Tools and printables for this guide

Interactive tool

Water competency self-check

Check yourself or your child against the five Red Cross water competency skills, see what to practise next, and review water smarts and safe helping.

Sources

  1. Know BEFORE you go in the water! (opens in a new tab) National Weather Service
  2. As temps rise, officials implore recreators wear simple life-saving device (opens in a new tab) U.S. Army Corps of Engineers (via DVIDS), 2025
  3. Swimming Safely in Lakes, Rivers & Streams (opens in a new tab) American Red Cross
  4. Water Safety (opens in a new tab) American Red Cross
  5. Aquatics Centennial Campaign (opens in a new tab) American Red Cross, 2020
  6. Water Competency (opens in a new tab) Water Safety USA
  7. Safety Tips for Open Water Swimming (opens in a new tab) U.S. Masters Swimming
  8. Cold Water Hazards and Safety (opens in a new tab) National Weather Service
  9. What Is Cold Water? (opens in a new tab) National Center for Cold Water Safety
  10. Water Temperature Safety Guide (opens in a new tab) National Center for Cold Water Safety
  11. Rip current safety ahead of the July 4th weekend (opens in a new tab) National Weather Service
  12. Preventing Drowning (opens in a new tab) CDC, 2025

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