How low can we go? Triggers for early harvest?

Low temperatures are most times not the Problemns.. if temps are falling for a Night to Zero or under zero , Its no big Problem for the Plant Look for aPLace where shes Protectet to cold wind The only enemy is daylong continuatuing Rain in late flower------Or very Humid, cold days without wind or sun inbetween. Protect your Girl of direct rain onto the flowers.... that is crucial in growing outdoors Autumn has come, and iam in the same boat like you, I have a few big Plants , to get ready My earliest ones will be done in 10-12 days, the latest one in around 4 weeks but not before mid october A Part of the Plants got a rooF .. and those have the best conditions and i dont have fear for them the other ones whoare nearly done, dont have aroof, but I visit them every day Shaking the Rain out ofthe Branches Atm we had second day with some hours of rain, but always wind and sun inbetween. So everything is fine Thats just what I can tell you, Hemp is resiliant. Choose for Outdoor Early flowering, or so called "express" Genetics.... it helps tremendous if you can finish them later September or first Week October Later bloomers need aroof , and all need daily visits with checking buds for MOld If you detect,,, be ready to harvest very fast, because Mold dont stopps in cutting away small pieces,,,, Thats my experience