Early on rides do generally start at 6 pm, but it comes down to the ride leader and their availability. We do have light until around 8 pm now so a 6:30 start at this point still gives a good amount of light.
If there’s a specific ride you are curious about you’re best bet is to talk directly to the ride leader. They can always poll their regular attendees and see if there’s a preference one way or another, that is if the leaders schedule allows for an earlier start.