Alien's Locations and how to hunt

Aliens spawn at the following locations between 2200 and 0400.
If you are off before 21:00 and come back at like 2300 with no players on there's near 100%chance that all aliens will be spawned and ready to kill.
Have them dead by 0400 or you will get nothing.

V2 (Colorado)
⦁ Death valley 1 Alien
⦁ Emerald peak 1 Alien
⦁ Secret spot 1 Alien
⦁ Norad Airport 2 Aliens
V1 (Colorado V1)
⦁ Frosty pines 1 Alien
⦁ cyrstal lake 1 Alien
Caliwood
⦁ amerly station 1 Alien

Please note. If there are people on the server about 2100 on, it is hit and miss if and when they will spawn at those locations.
Try to stay out of the area they spawn in if people are on the server, Wait till around 0230 or later and move in to see if it spawned.
Hope that helps. It's way easier to kill them on private server because you can control whos on when.