If it freezes when there is water in the pump it will burst the pump and probably the lines when it freezes.
I modified a check valve for use as a spring-loaded faucet valve and the same will work for you.
I disassembled an ordinary spring-loaded poppet check; then drilled a small hole in the top of the poppet (opposite side of the screw and spring) so I could solder in a small loop of copper wire.
Install a TEE where the suction pipe turns from vertical to horizontal (below the frost line), with the run of the tee pointing up. Install a pipe from the TEE to above the ground.
Run a wire from the check valve to just above the pipe extension. Cover the end of the pipe with a 4" nipple/coupling/cap assembly.
To drain the check valve, remove the nipple/cap and lift the wire. Use something to hold it up. Release it before you try to start the pump.