Those look delicious.
How many trees and how much space do you need to grow that many cherries?
Part of the fun of picking your own cherries is wandering from tree to tree, eating and picking cherries as you go. Also, depending on the variety, you look for a certain color in the cherries which indicate they are "ripe" and ready to eat.
In the case these cherries -- Brooks -- you look for a deep maroon instead of a bright red color in the cherries, which is not evenly distributed on a particular tree or between trees. So, there is a bit of a "hunt" involved. The pic of the small bunch of cherries above is the "color" that I look for.
One tree can easily provide more than the 6# of cherries that I picked. If you're trying to grow them in your backyard, you need at least 2 cherry trees so that the bees can cross-fertilize them. I've got 1 cherry tree in my backyard (that a prior owner planted) that never yields anything.
The trees are planted about 10-12 feet apart and grow to about 12-15 ft high. They are puned back pretty severely at the end of each season.
The cherry orchards/farms vary in size but even the smallest easily have hundred of trees and the largest thousands; some even in the 10's of thousands. Here are examples of a single branch and a single tree filled w/cherries:
Of course, productivity varies year to year but this year the cherries were very early and very abundant. Actually a bumper crop year but prices are as high as they've ever been -- $4/# for U-pick and $5/# for pre-picked -- at the farm/orchard.
BTW, cherries are so early and abundant this year that even toddlers can pick them off of branches at ground level (as in the pic above) which is pretty rare BUT, in lean years (or late in the season), you have to use 10# ladders to climb up to the top of the trees (which can be dangerous) to grab what few cherries are left.
Memorial Day Weekend is the typical start of the cherry season and it's a "family event" that draws people from all around the Bay Area (and beyond) to come to pick cherries around here each year.