i trimmed about 2 months ago maybe a 1/2 an inch, and my curls behaved much better after that, but i think i only needed it b/c i used poor quality scissors for my bc and they messed w/ my ends...chicoro recommends doing length based trims. "If you are trying to gain length, then a length based trim may be just for you. Instead of trimming your hair based on a time table such as every 6 to 8 weeks, you base your trim on other factors: its length and your hair goals...." basically you only trim every 6-8 weeks if u want to mantain a certain length, trim based on length to reach ur goal faster so maybe instead of every 6-8 weeks, you trim after every 3 inches of growth, or when your hair is damaged and needs to be trimmed...i probably wont trim until march which is my one year nappyversary when i plan on doing a silk wrap...teri from tightlycurly said she hasnt trimmed in over 10 years and her hair is fine so i guess its you only have to trim if you feel your hair needs it...and if you take preserve and maintain your hair then their wont really be a need to trim unless you want to keep your hair the same length or even it out