Most Effective Time to Train ???

I'd recommend trying each a few times to see which feels better. I know people who do all their training in the evenings and can't stand getting up. On the other hand, I find it much easier to drag myself out of bed and get things done as early as possible. If I wait until the evening, everything is just that much harder.

As to the question of whether one time is empirically better than another, I know I've read about studies that suggest this time of day or that one. Fortunately, they tend to contradict each other, clarifying nothing.

I will say that my preference for morning training has caused a major lifestyle shift. I used to be something of a night owl. Now, though, I really only see 11 PM at times of special celebration. I'm fine with that, but I know that's not acceptable to some. As ever, YMMV.

Good on ya for starting up, and good luck finding the right time for you.

For most people, the work/family schedule dictates much of our training timing. I like to train mostly in the morning, when it's convenient for those reasons, it's cooler, and it's closer to the timing of races. I think it's also good to get some training in during the hot hours, though, because that's not a good first experience to have on race day.