it depends on where u live also...check a Farmers Almanac to find out when daylight hours go less than 12 hours PER DAY..that is when the flowering season starts in your area...now if u know how many weeks it takes to flower the strain you're using, u can count from the flowering point to the harvest point .. if the harvest point is past the first freeze point , then u will have to pick a strain that matures earlier to avoid freezing...K.