Back home in East Texas, they grow in some cow fields and not in others. Like you could get a pound out of one field and then literally cross a fence and not find a single one. I've always thought this was due to what the cows are being fed but I'm not sure.
We'd always wait until Late May through June, with the temps consistently hitting the high 70's but not crossing into the 90's yet consistently. Cubensis can't handle night time dips into the 50's so we'd usually just wait until night time temps were only dipping to the low 60's to ensure a good haul. We'd hunt about 36 hours after a good rain shower. You'd just find them popping up out of old dung stacks and pull them up. We'd tap the caps a couple times before we pulled them to ensure the spores fell to the ground. You learn pretty quickly what they look like and I'll toss a picture in of what a cube stem looks like when it is bruised. It turns a blueish purple color. If it doesn't bruise like this, it isn't a cubensis. We'd trim off the bottoms and then toss them in a food dehydrator overnight.
East Texas and Southeast Texas are probably one of the nicest environments for Cubensis mushrooms in the world though with the high humidity and temperature, so I figured I'd show off my haul from the last time I went hunting a few years ago. I think I snagged a quarter pound off of 30 minutes of picking? It's been a while so I don't remember the exact dry weight. Every batch in the wild hits completely differently. I remember these being insanely visual.
Also attaching a picture of a beautiful Cube that ended up drying to 5 grams, which is insane. I believe that's it next to that lighter. You can see an equally large one on the right of that same tile.