I have convinced my co-worker to start beekeeping and of course, in Montana, spring can take a long time to get here. Despite 75 degree temps a couple of weeks ago, it is snowing today. His package of bees is coming tomorrow and i am going to help him install them. How cold is too cold to install a package of bees? is there a rule of thumb minimum temp? and if so, how long can they hang out in the garage with sugar water sprayed on them?