For sure you can grow bubba kush outside..........hence it being a kush it will be a nice indica plant good for growing in the midwest.......shit ive grown sativas in the midwest before.So your answer is YES....you can plant just about any strain and it will grow.
weed is well .....a weed, it is suposed to grow outside. the only consideration is the flowering time. will it finish before your area has a hard frost? modern kush strains all finish early... your in luck if your not in northern canada.
Any strain that has kush in it is most likely a decedent from a strain that grew in the kush mountains....My plants make it threw a few light frosts with no problems. smoke on