The best times to visit White Rock, South Dakota, are during the warmer months, specifically from June to August, for outdoor activities, or in September and October for a quieter experience with pleasant weather.The summer months offer the warmest temperatures, making it ideal for enjoying Big Stone Lake. You'll find plenty of opportunities for boating, fishing, and swimming. This period is particularly good for families looking for a classic lakeside holiday, with longer daylight hours for outdoor fun.For couples or those seeking a more tranquil getaway, late spring (May) and early autumn (September to October) provide agreeable weather without the peak summer crowds.