Training to 8-miles in cold water

I'm training to swim 8 miles again (summer 2026. 2025 got away from me).  Being an open water distance swimmer in Idaho can be difficult but it's not impossible. I'm hoping the USMS community can share what they have learned about swimming in cold fresh water.

Results: My first swim was completed in approximately 4hrs 15 minutes

Goal: cut down my swim time to 3hrs 30 minutes (cutting 5 1/2 minutes per mile)

Background: I live in a small town of 520 people with no access to a public swimming pool. The nearest pool is a 90-minute drive. As a result, I purchased a propulsion pool to train for distance swimming. I live at 6,000 ft elevation. The reservoir is close at 5,500 ft elevation. 

Reservoir swimming: Most of the "lakes" around me are man-made. Utilized for watering the crops in the area.

Timeframe: The reservoirs are frozen for 4 - 6 months per year. The best time to swim a reservoir is mid to late July.

Water temperature: The water is typically 50 - 55 degrees F. 

Training regimen: I make a plan. The plan is broken down into the overarching goal, swim 8 miles. From there, it is broken down into monthly, weekly goals. 

      For example, my monthly goal is to increase my swim time from 40 minutes to 60 minutes. 1st week goal is maintaining            50 strokes per minute (SPM) for 40 minutes, 2nd week goal is maintaining 45 SPM for 45 minutes, 3rd week goal is                  maintaining 50 SPM for 50 minutes, 4th week goal is maintaining 45-50 SPM for 60 minutes.

      I use SPM because I have ProForm goggles that display SPM information for me to track.

Cold training: My pool is kept at 68 degrees F. Two months prior to my swim, I will start doing short swims in the reservoir. This really helps get the body used to the cold water. 

Lesson learned: My first swim was with a swimsuit, cap, and goggles. This next swim will be with a 3mil wetsuit, cap and smart goggles. After my last swim, I was frozen by the time I got to mile 7 of 8 and it took 2 hours to warm up.

Other training: I incorporate strength training, cardio, and flexibility exercises into my training program. I have come to love warming up on my echo bike (10 miles), then its strength training (legs everyday), 1-mile walk on the treadmill at a 7 - 8 incline, followed by flexibility exercises and stretching. 

Question to the group - What advice would you have for me to help me reach my goal of cutting 45 minutes off my swim???

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  • I can see that the SPM training is a good way to build your speed over longer distances. However, in your actual swim…out in the elements…SPM ‘could’ end up being inaccurate, or a misnomer, if/when you’re swimming against even a lite wind. In other words, after a ## strokes you won’t have gone as far against the wind as you would have in its absence. Just about all my open water swimming is at sea level, in the brine. And I will say that just about ALWAYS, when I turn to swim against the wind, even slight winds, my pace drops off noticeably. It’s obvious on my Strava entry. Even on the half-mile loop I have round a mooring field at my neighborhood beach…you can see my pace drop off on every lap when I’m going against the wind. Secondly, your leg training. I mean in addition to swimming, I’m a cyclist and a bit of a runner too. So if you’re adding the leg regime just to vary your cardio training…I get that. But WRT to actual swimming…are you kicking that much? Why? Limit your kick to maintaining good body position, and reserve that energy for your stroke. The neoprene of the wetsuit legs will help with that too. Regarding your body core temperature…I have friends here in Rhode Island that swim in the open water through the winter. Plus/minus 1-hour swims in water temps in the high 30s°F. In addition to their wetsuits, they wear neoprene gloves, booties, and a neoprene hood. Since you plan to wear a wetsuit in your actual swim…and thereby couldn’t be considered for recording by the MSF which doesn’t permit ANY neoprene…you might consider adding those items to help maintain a warmer core temp. — Dan

  • Thanks for the information. 

    The reservoir i swim in has no internet service so I'm trying to figure out something to maintain my focus. Totally agree that choppy water will effect the accuracy. I'm adhd and even a mile swim challenges my focus. 

    I rely on my legs quite a bit for propulsion. I've had 3 shoulder surgeries. One left and two right.if I don't maintain a 6 beat kick, I may swim backwards. LOL the farthest I've swam is 11 miles maintaining that kick. May be from growing up as a runner. 

    The reservoir is covered in two feet of ice and snow during the winter. With outside temps dropping to as low as -40 degrees, swimming outside is suicide. Not to mention that the access points are impassable because of the feet of snow. 

    I will definitely look into a hood and gloves for my swim. I've never used a wetsuit, should be interesting. 

    Chris

  • Oh. In your OP you mentioned that you did use a wetsuit in previous swims. Not sure what you mean by internet service WRT to maintaining focus. At any rate…doing cold water plunges through the winter may help with acclimating. Yikes on the shoulder surgeries. I’ve had one for a torn rotator cuff. Recovery from them is terrible. — Dan

  • In my original post I said "This next swim will be with a 3mil wetsuit, cap and smart goggles." It was one of the lessons I learned from swimming in cold water in a swimsuit. LOL

    I believe the STRAVA app requires cell service (internet) to utilize. I'd be interested in using the app for other swims. What do you like/dislike about it?

    My smart goggles won't give me much information apart from SPM unless I'm swimming in a pool, then they can give all kinds of information.

    Amen on the recovery from surgeries ... they suck! I had both shoulders fixed 20 years ago, and the right one fixed again (torn labrum) 5 years ago. Hoping I'm done with surgeries. 

    Thanks for the communications.

    Chris

  • I believe the STRAVA app requires cell service (internet) to utilize. I'd be interested in using the app for other swims. What do you like/dislike about it?

    Strava and other fitness tracking, and navigation apps on cell phones use GPS (and cell if/when available). There are certain aspects of Strava that require cell connectivity…such as sending the Strava Beacon txt. But if you have your cell phone with you on the swim, it will track your movements using GPS (all cell phones have a GPS receiver built in). And of course if you’re using a fitness device, it can connect to the phone via Bluetooth…either during the activity (if you have the phone with you), or after the activity once the phone is back on your person (if you have the GPS device paired with the phone). Strava probably isn’t a great app for swimming. I use it this way: I have an old, basic Garmin GPS watch that was developed simply as a running watch, the Forerunner 25(now discontinued). Since it was developed as running watch it doesn’t work in the water very well. It’s waterproof, but its software looses satellite connectivity when it plunges into the water. SO…I strap it to the top of the inflatable safety buoy that I pull. It stays above the water, and GPS connected. Then, back at the house, I upload the activity from the watch to my Strava account. But I don’t get any stats other than a map/route, distance, time, and pace (Strava then estimates SPM but it isn’t accurate). There are fitness watches available that are developed specifically for swimming (o/w and pool) that have all those bells and whistles. But I just don’t need all that for my personal use.

    Dan

  • Thanks for the information. It's always difficult with where I swim. My phone has zero service. It's a beautiful swim though. 

    Chris

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