Answer:
They grow all in the Northern Hemisphere. They tend to grow at the edge of trails and roads, places where they can get sufficient sunlight. Wild strawberries can grow in a wide range of climates as long as it's not too dry or wet.
If you're looking to find wild strawberries, look during Spring when they're ripe. I've heard the first day of summer is a good day to look, but they might be a little too ripe.