How cold is too cold for taking my Leo hatchlings outside for some sunshine and natural grazing? It's 64 here today with plenty of sunshine. Ground is damp but the grass is dry. It rained yesterday morning. They have a big black tub that is warmer because of the sun beating down on it that is also an outdoor option for them. It already had substrate and hides in it but I'm just wondering about temps and what's safe and what isn't.