fall is coming when is the best time to start a sourdough starter

fall means different things to different folks if you mean the season where it gets cold at night and warm during the day and the leaves start to change colors and fall to the ground and the season will get gradually colder then we are on the same page the best season is one where the temperatures tend to stay the same above 75 or 23  large differences in night day temps throw havoc into observing the starter for some kind of routine when there is no prior experience with fermentation on the other hand if you know activity will slow at night with the temperatures then you can take advantage of the little retards nature is offering you dont expect too much growth at night unless you have a warm spot for the starter many find that as seasons change the starter has to have a feeding tweak from the standard routine either more flour or less depending on temperatures  you can start a starter anytime the trick is to keep it warm and not too warm so it can ferment  i would pick a busy season to start one because then you have plenty of other things to do than to sit and watch your starter for each phase along the way it may take a week or two and plenty of patience a key ingredient to letting it grow 

Now, whether it's Sept, Jan, Mar, or June.