>>I just got a new Kingsnake who I believe is fully grown a few days ago and I was told he was due to eat today, I got a mouse for him and he wont eat it. Its been cold lately and hes not as active as he was when I got him, could that be the reason hes not eating?
he could be "in shed"--are his eyecaps cloudy? Even if they're not, snakes clear up for a few days between that cloudy condition and when they shed, and many of them will not eat during either period.
but i'd vote with the other guys' beliefs it's temp and environment related,
also, i'd suggest you read the care sheet for kingsnakes avilable on kingsnake.com
good luck!
terry