Yes. I’ve ran in the dark regularly here for well over 10 years much later than 6:30/7 pm. I don’t know where you’re running exactly but I’ve always passed a fair amount of other runners out before 9:30 pm even in winter. Plenty of people out walking before 10 pm too. After 10, there’s not a ton of people out unless it’s a Friday or Saturday. I wouldn’t worry about 630/7 pm at all. Your biggest worry should be cars running lights, not stopping, or just not paying attention. Every time I’ve been harassed has been in the early morning not evenings except once at 5:30 pm in broad day light on a U street with tons of people walking by where a man tried to grab me. The number of times I’ve almost been hit by a car when I have the right away exponentially outnumbers the times I’ve been harassed.