Welcome to WhitneyZone, lawnerd! And congratulations on scoring the permit.

In the other section, you wrote:
This is my first trip to Whitney. I posted a topic under General Discussion for advice! Sounds good thus far! Thanks!

As Bee wrote, Whitney can be quite pleasant in the fall.

But the biggest warning I can give is to watch the weather forecasts. It can be dry and calm, but October usually sees the first winter storm hit, too. If any significant weather is predicted just prior to your hike, I'd cancel if I were you. If a storm passes through a week or more before your hike, the trail can have some snow to tramp through, too. It won't be terribly deep that early, but it could slow your progress.

The one thing you might keep in mind, if you want to try earlier in the season, there are often many unused permits available, especially mid-week days. Check the Unused permits numbers from last year. If you went a few weeks earlier than Oct 1, your odds for foul weather would be lower.