10 Best Triathlon Watches 2025 in the United States

The Apple Watch Series 11 (GPS 46mm) offers a sleek and lightweight design that’s comfortable for all-day wear, including during exercise and sleep tracking. With water resistance up to 50 meters and dust resistance rated IP6X, it can handle swimming and outdoor workouts well, making it suitable for triathletes. The built-in GPS supports multiple satellite systems, ensuring reliable and accurate tracking of your routes and pace, which is crucial for training and race-day performance. Heart rate monitoring is advanced, with both optical and electrical sensors providing real-time data, plus alerts for irregular rhythms and high or low heart rates. This helps you keep your training in safe and effective zones.

The Garmin Forerunner 265 is a strong choice for triathletes thanks to its bright 1.3-inch AMOLED display and a comfortable, lightweight design. It offers solid battery life, lasting up to 13 days in regular smartwatch mode and around 20 hours with GPS active, which is great for long training sessions or races. Its multi-band GNSS with SatIQ technology improves GPS accuracy, especially in tricky environments, helping you track runs, cycling, and open-water swims more reliably.

The Apple Watch Ultra 3 is a strong contender for triathletes thanks to its rugged design and comprehensive features. Its titanium case and sapphire crystal display make it highly durable and able to withstand tough conditions, including water resistance up to 100 meters—ideal for swimming and water sports. Battery life is solid, offering up to 42 hours of regular use and up to 72 hours in a low power mode, which is beneficial for long training sessions or races. GPS accuracy is top-notch with dual-frequency support, helping athletes track routes precisely across running, cycling, swimming, and other multisport activities.