My 2005 Toyota 4runner with a v6 will not start when the temp gets below 32 outside what could be my problem

Could be several reason as stated. But I would go after the engine coolant temperature sensor first. needs to go on a scanner to diagnose.

There could be several reasons why your engine will not start. When you first turn the key to the On position (without starting the engine), the lights on your dash should illuminate. The yellow Check Engine light should come on, at least for a few seconds. If not, then you are not getting power to your engine computer. Perhaps the fuse is loose. Locate the Engine fuse in the cabin fuse panel and wiggle it while watching the dash lights. When the Check Engine light illuminates, you should be able to start the engine. If not, then it is time to check for spark. You can remove a spark plug, install a jumper between the ground electrode and the engine block, insert the spark plug securely into the spark plug boot, and have an assistant crank the engine. If you see your spark plug firing, then you can assume you have a fuel delivery problem. Have the system pressure tested. You may have a weak fuel pump.