Re: When to add supers ?
handhewn, You were asking about a "rule of thumb" of when to harvest, you can harvest at any time that the honey frames are capped, or leave the supers on the hive and harvest in September. If I need early honey I will go through my supers in July and look for capped frames, after harvesting these I place the extracted wet frames back in the supers and leave them till September. When harvesting in September it is always best to check your hives at that time to see if the brood boxes have the stores they need for the up coming winter then you can give them a few of the honey frames if needed or feed.
I am located not too far from you down the river in Belpre, 57 and forgetfull as well, I hope your hives do good this year.
Bill...in Southeast Ohio Zone 6A, Never look down on anybody unless you are helping them up