10 Best Triathlon Watches 2025 in the United States

The Apple Watch Series 10 is a versatile smartwatch that suits many fitness activities, including triathlon training. It offers a bright, larger screen with a lightweight and comfortable design, making it easy to wear all day and during workouts. The watch’s water resistance up to 50 meters means it’s safe for swimming, an essential feature for triathletes. Its GPS supports multiple satellite systems for accurate tracking of your routes in running, cycling, and swimming. Heart rate monitoring is advanced, including ECG capabilities and notifications for irregular heart rhythms, which can be useful for closely monitoring your performance and health.

The multisport mode supports a wide range of activities like running, cycling, swimming, and more, offering detailed workout data and training load insights, helping you improve your fitness effectively. Durability is solid with dust resistance and a crack-resistant screen, suitable for outdoor conditions. Connectivity is strong via Bluetooth, Wi-Fi, and GPS, allowing you to receive calls, messages, and use Siri on the go, but it requires an iPhone to unlock its full potential.

Battery life can last a full day with normal use, which might require daily charging for heavy training days, though fast charging helps recover quickly. The watch also includes innovative safety features like fall and crash detection, adding peace of mind. Compared to some specialized triathlon watches, it may lack longer battery endurance for ultra-distance events and doesn't have built-in cellular connectivity in this GPS-only version. This makes the Apple Watch Series 10 a great fit for triathletes who want a feature-rich, stylish smartwatch that tracks multiple sports with strong health insights and smart connectivity, especially if they already use an iPhone. Those needing very long battery life or a watch focused solely on endurance sports might want to explore dedicated triathlon watches.

The Apple Watch SE (2nd Gen) offers a solid mix of features suitable for casual and beginner triathletes. It has built-in GPS that provides reliable location tracking during swims, bike rides, and runs, although it may not be as precise as some specialized triathlon watches. The watch is water resistant up to 50 meters, making it appropriate for open-water swimming sessions. Heart rate monitoring is included and offers useful insights during workouts, though it lacks some advanced sensors found in higher-end models.

This watch supports multiple workout types through its Workout app, allowing users to track different sports separately, which is convenient for triathlon training. Battery life is average—sufficient for a day of mixed activities but likely requiring daily recharging, especially when using GPS. Its durability is good for everyday wear but may not hold up under very rough conditions as well as dedicated sport watches.

Connectivity is a strong feature, particularly for iPhone users, as it syncs easily and offers extras like music control, calls, and emergency features. While it is not a top-tier triathlon watch, the Apple Watch SE (2nd Gen) is an excellent choice for those seeking a smartwatch that balances fitness tracking, safety, and smart features within a stylish design.

The Apple Watch Ultra 2 is designed as a rugged, all-around sports watch, making it a strong choice for triathletes and outdoor enthusiasts. Its battery life is impressive—up to 36 hours in regular use and 72 hours in Low Power Mode—so it can easily handle long training sessions or events. Water resistance up to 100 meters and dive computer support make it suitable for swimming and diving activities, covering the water sports side of triathlon well. The dual-frequency GPS is highly accurate, providing precise tracking for running, cycling, and open water swimming routes. Heart rate monitoring is advanced, with features like ECG and blood oxygen measurements, giving detailed health insights during workouts.

Multisport modes and customizable workouts cover running, cycling, swimming, hiking, and more, helping you track and improve in all triathlon disciplines. The rugged titanium case and sapphire crystal offer excellent durability against bumps and scratches in rough environments. Cellular connectivity allows for calls and music streaming without a phone nearby, adding convenience during training or races. The watch’s large 49mm case might feel bulky for some users, especially those with smaller wrists, and while the Apple ecosystem is very smooth if you already have an iPhone, this watch is less practical for users with other smartphones.

The Apple Watch Ultra 2 stands out as a versatile, durable triathlon watch with excellent GPS and health features, though its size and platform dependency could be drawbacks depending on your preferences.