Riches, 19, came through the academy at Scunthorpe United and impressed playing against the Pikes back in May 2018.
Manager Steve Roberts said: “I am delighted to welcome Sam to Pickering Town.
“He is an excellent shot stopper who's distribution is also to a very high standard. At 19 he will only get stronger and I am really excited to be working with him.”
Keep up-to-date with our exclusive email newsletters.
Subscribe