Are variables declared with let or const hoisted?

I have been playing with ES6 for a while and I noticed that while variables declared with var are hoisted as expected…

console.log(typeof name); // undefined
var name = "John";

…variables declared with let or const seem to have some problems with hoisting:

console.log(typeof name); // ReferenceError
let name = "John";

and

console.log(typeof name); // ReferenceError
const name = "John";

Does this mean that variables declared with let or const are not hoisted? What is really going on here? Is there any difference between let and const in this matter?