In MN it gets dark about 5:00 at the earliest. Right now it's about 5:30. In summer it stays light until 9:30 or so. Even later if you go farther north. It's awesome in summer.
Wow - you're slightly more south than we are. Minneapolis is 44.9833 degrees, Portland is 45.5200 degrees.
On the first day of winter last month the sun set at 4:30 p.m. I love that.