There is a slightly different cold weather starting procedure on the new tractors. I don't know about yours, but be sure to turn the key to on position where you hear the mechanical pump ticking, wait for the welcome message to complete and watch the screen for the glow plug symbol to be on. Don't crank until glow plug symbol goes off. I don't see the glow plug symbol until the temp is around 17. Check your owner's manual for other directions.
Aside from the other frozen/gelled fuel problems mentioned above, there may be something wrong with that system.