Is there a reason why all houses and shops (except the Tavern) are locked on 1st of Fall? I tried to get my upgraded watering can back and found that Svens House, Lylas and the Animal Farm all said the were locked the entire day. Next das everything was back to normal again. 

Depends on if you had just patched as in this was the day immediately following a patch. The way NPCs patch, at the moment at least, involves them all getting a partial reset during the first day after a patch. If no patching was involved I’m not sure. There is no intended reason so it may have been a bug I can look into.

FYI: No patch involved.

Also same thing happened again first day of winter. Not a big deal, just very confusing it happened the first time.