A dog park is best visited on a weekday, either early in the morning or late in the evening. Weekends tend to be busier, so it is best to visit a park during the week. People are either still asleep or getting ready to go to work, so it's best to get there early enough.  Your pup will be able to enjoy the park by themselves if you arrive early enough. People are already getting ready to go to bed after having eaten dinner. This means there will be fewer people at the park. This will make it less crowded than the rest of the day.