General location
Take a look at world maps that show the lowest latitude extents of the ice sheets during the last ice age. You will probably want to consider areas that are at least 100 miles away from the lowest latitude incursions. There is good evidence that the land-based climate away from the ice sheets was not much different than that of today, and that summers were cooler and more tolerable further south from the ice sheets.
It is probably desirable to stay at least an equal distance (100 miles) from coastal areas due to uncertainty in weather/climate patterns and possible tsunamis. One hundred miles may seem like a lot, but coastal devastation will likely result in mass migrations of refugees from these areas, and you will want a good buffer zone. In fact, 100 miles may not be enough.
Another important consideration for the general location is fresh water. Areas with 40-60 inches (100-150 cm) per year rainfall rate will generally have plenty of ground water at shallow depth for a well. Such areas will likely be lush with vegetation and appropriate for raising animal stock without heavy reliance on supplemental feeds. Natural creeks and springs may offer additional benefits. Birds, bees, and abundant wildlife are very good signs - particularly if hunting becomes necessary.
When you begin to narrow down the possibilities to more specific areas, take a look at the County level. Look for Counties (or provinces) that do not contain any large metropolitan areas. If the County is primarily rural then it will likely be friendly for wells, building, farm infrastructure, low-cost labor, etc. "Rich" counties are much more associated with deep levels of bureaucracy that can put a real strain on your time and budget.