The later it gets, the shorter time they will be slumbering, so the less winter feed they will need. Bees do not forage for nectar unless there is a net gain. Late brooding bees are your worst enemy - italian strains particularly?
The problem times should not occur until brooding commences in spring - too early and they are more likely to run out of stores before any nectar sources are available. But sensible hefting should indicate any problems at that time. Mine, being on 14 x 12, are fairly bomb-proof re stores for both winter and spring; deeps will be less so. Early brooding and a really cold snap can cause isolation problems, or at least make it worse, if the bees have brood to be kept warm and stores the far side of the hive, I suppose.
But I will cross that 'bridge' only if it arises.
