Evenings only, mainly field edges, and only hunting cold fronts. It also doesn't make any sense (to me at least) to hunt a spot that isn't showing movement during shooting hours. I'm assuming you're talking about bucks.
Then hunt that spot! Hopefully you don't blow em out going in.
It just depends on the area. I don't think anyone can definitively say "oh the evening is way better during early season," or "the morning is more productive." There are too many factors. A guy on one property may not be able to access it without bumping deer unless he hunts the evenings. On another property, the opposite could be true. The bottom line is, early season deer can be very predictable if they don't know they're being pursued. So hunt whichever time of day or whichever stand location keeps your impact as low as possible.
It just depends on the area. I don't think anyone can definitively say "oh the evening is way better during early season," or "the morning is more productive." There are too many factors. A guy on one property may not be able to access it without bumping deer unless he hunts the evenings. On another property, the opposite could be true. The bottom line is, early season deer can be very predictable if they don't know they're being pursued. So hunt whichever time of day or whichever stand location keeps your impact as low as possible.