Too late to flower outdoors?

Hey i was wondering if it is too late in the season to bring my purps outdoors to flower, it is mid to late august and im in central ontario. I want to give them enough time to flower properly but from what i understand they will go nicely into september and october ( bringing out the purple in the them). Should i perhaps flower them for a few weeks indoors and then put them outside? in that case how do i harden them off and prepare them for the outdoors? The reason i thought of kick starting the flowering indoors is because i had some other outdoor purps which had already began flowering outdoors until they got snaked from my spot. Needless to say i will be prepared for that this time, but if any one could give some advice that would help alot. thx and sorry for so many goddamn questions