Like the rest says, sure you can. I'd just like to say, the easiest is to house the same subspecies together. I keep couple's all year round together. Only if I fear cannibalism for the new-borns, than I seperate the male from the female. Feeding them seperate is best, and otherwise keep a close eye that the female doesn't eat the male by mistake.

You can also hous snakes of different subspecies together, but best of the same size and with the same gender (so you won't get the possibility of hybrids or intergrades). I also know quite some people who do that and it works for them. I personally don't do that. I've also heard the stories of wandering garters being cannibalistic, don't know if it's true or not.