I planted an avacado tree from seed awhile back. It's about 12 inches tall and in a large pot . I'm wondering when I can leave it outside. I live in southern Wi. The lows at night are now at around 50 degrees.

It can go out now but move it to a sunny location SLOWLY. Start with full shade, graduate slowly to full sun. This could take up to 2 weeks.

If your avocado seed was from a grocery store purchased avocado, it is probably a Mexican or Guatemalan variety, a semi-tropical. That means your tree will be hardy close to freezing with some reservations. If the temperatures bounce off freezing at night but warm up nicely during the day, all will be well with your little tree. If the temperatures stay near freezing, bring it in.