Is a For Loop always executed at least once?

You could say a for-loop is always evaluated at least once.

But if a for-loop's condition is not met, its block will never execute.

Because you didn't ask about other loops, I won't address those.

A loop will only execute while its condition is true. Since a for loop and a while loop both check the condition before the body is executed they will never execute if the condition is false.

The only loop that will is a do while loop. With a do while loop the condition is not evaluated until the end of the loop. Because of that a do while loop will always execute at least once.

A for-loop always makes sure the condition is true before running the program. Whereas, a do-loop runs the program at least once and then checks the condition.