I was just looking up this timeline yesterday for a fic, how coincidental! I ended up researching corn and wheat harvests in Kansas and found a great website about typical corn harvest times. It was suggested that corn is harvested late Sept, into October, weather dependent, and where you are in the state.

https://webapp.agron.ksu.edu/agr_social/m_eu_article.throck?article_id=1152

I had to have a search online as our growing and harvesting season is so short where I am. We're already bringing out the snow shovels in September!

As for fandoms, especially those fans that write themselves, I've found them to be largely forgiving! I'm still new to this particular fandom, but everyone seems fairly chill.