i enjoy picking fruit.  fruit picking is a season activity that occurs during the harvest time in areas with fruit growing wild or being farmed in orchards
What is considered harvest time?  Is it just a set time every year?
it really just depends on the type of fruit you are picking.  they also have harvest festivals that are annual celebrations that occur around the time of the main harvest of that region
That is neat.  So what types of fruits are picked?  
Apple picking is a big fruit in the US.  Apple orchards are even open to the public in some areas that allow customers to pick their own apples or they can also purchase pre-picked apples
Are there certain parts of the US that are especially known for their apple orchards?
as well. Apple picking is often a very popular dating ritual in the American Midwest. Apple orchards catering to a family outing will provide additional activities beyond the picking of apples. Many have petting zoos, restaurants and country shops that sell related products such as home-made jams and jellies. This aspect of the activity is especially popular in the Northeastern United States & Southern Ontario and Southern Québec in Canada.
The apples that fall off the trees are often used to make apple cider. Apple cider is a juice made
Fruit picking
Fruit picking or fruit harvesting is 
a seasonal activity (paid or recreational) that occurs during harvest time in areas with fruit growing wild or being farmed in orchards.
Types of fruit.
Types of fruit Apple picking.
Sultan kamara
Apple picking is an activity found at apple farms. Apple orchards may be opened to the public, allowing consumers to pick their own apples or purchase pre-picked apples.
Although this is ultimately a method of purchasing apples, it is often a social activity