A counterweight based rocket launch platform system and method uses gravity acting upon a counterweight to provide the initial assent for a rocket. This counterweight system is preferably built inside of a mountain so as to use the mountain as the supporting structure. By covering the exit opening with a thin membrane and closing the bottom, the system can have the air evacuated providing a free ascent without a terminal velocity. During the final moments of the ascent or after the rocket leaves the tube, the rocket will ignite carrying the payload into space. The velocity imparted to the rocket from the gravity assist in combination with bypassing the thickest part of the atmosphere will lower the amount of fuel required to lift payloads into space. This will result in increased payloads of existing rockets or the use of smaller and less expensive rockets.